Which of the following is not a basic architecture for dedicated circuit networks?

Which of the following is not a basic architecture for dedicated circuit networks?

a. ring
b. partial mesh
c. bus
d. star
e. full mesh



Answer: C

Which of the following type of networks permit packets from separate messages to be interleaved?

Which of the following type of networks permit packets from separate messages to be interleaved?

a. circuit switched network
b. dedicated circuit network
c. dial up circuit network
d. packet switched network
e. Fractional T-1 network



Answer: D

In ______ geometric layout for a network, every computer is connected to every other computer often by point-to-point dedicated circuits.

In ______ geometric layout for a network, every computer is connected to every other computer often by point-to-point dedicated circuits.

a. full mesh design
b. ring design
c. star design
d. bus design
e. partial mesh design


Answer: A

A _______ geometric layout for a WAN connects all computers to one central computer that routes messages to the appropriate computer, usually via a series of point-to-point dedicated circuits.

A _______ geometric layout for a WAN connects all computers to one central computer that routes messages to the appropriate computer, usually via a series of point-to-point dedicated circuits.

a. ring design
b. mesh design
c. bus design
d. star design
e. mesh design



Answer: D

Which of the following is not a benefit of packet switched services?

Which of the following is not a benefit of packet switched services? 

a. The data transmission rates tend to be lower than dial-up or dedicated circuits.
b. You don't have to set up dedicated circuits between each end point from and to which you wish to transmit data and/or voice.
c. You have the flexibility to send data through a temporary circuit between two connections that will be disconnected as soon as the digital transmission is completed.
d. All circuits are less susceptible to a great deal of noise because they are digital.
e. You don't have to specify all the interconnecting services you need for your WAN when you buy the service.



Answer: A

Which of the following is not a problem with dialed circuits?

Which of the following is not a problem with dialed circuits?

a. Data transmission rates on dialed circuits are relatively low.
b. Dialed circuits may vary in quality.
c. Transmission rates for dialed circuits can vary with each call.
d. It is hard to predict if a given connection will be clear or noisy.
e. Use of these circuits is very simple.



Answer: E

When a person uses a regular modem to make a connection to an Internet service provider through POTS, the data travels over a:

When a person uses a regular modem to make a connection to an Internet service provider through POTS, the data travels over a: 

a. dedicated circuit
b. dialed circuit
c. ISDN circuit
d. VPN circuit
e. T-1 carrier circuit


Answer: B

Which of the following is not an advantage of a WLAN?

Which of the following is not an advantage of a WLAN?

a. The ability to use the network in places where it is impractical to install a wired network.
b. WLANs enable mobile users to work at different locations within an office building and stay connected to the network.
c. WLANs enable business travelers to connect the Internet from within waiting areas.
d. WLANs allow users to work more securely than a wired LAN.
e. WLANs cost less to install and operate in most cases (except new buildings) than wired networks.



Answer: D

At the top of the Internet structure are national ___________, such as AT&T and Sprint.

At the top of the Internet structure are national ___________, such as AT&T and Sprint.

a. Network Access Points
b. Internet service providers
c. bridges
d. LATAs
e. digital subscriber lines



Answer: B

Which of the following is a primary advantage of a VPN?

Which of the following is a primary advantage of a VPN?

a. low cost
b. inflexibility
c. unpredictable traffic congestion
d. security
e. complexity to the user



Answer: A

Which of the following is not a basic architecture for dedicated circuit networks?

Which of the following is not a basic architecture for dedicated circuit networks?

a. ring
b. partial mesh
c. bus
d. star
e. full mesh



Answer: C

In a packet switched network, permanent virtual circuits that look very similar to a _____________ (for hardware-based dedicated circuits) move packets through the network.

In a packet switched network, permanent virtual circuits that look very similar to a _____________ (for hardware-based dedicated circuits) move packets through the network.

a. cloud-based ring design
b. cloak-based mesh design
c. cloud-based mesh design
d. common carrier ring design
e. common carrier bus design



Answer: C

_______ are companies that build a data and telecommunications infrastructure from which other companies can lease services for WANs and MANs.

_______ are companies that build a data and telecommunications infrastructure from which other companies can lease services for WANs and MANs.

a. Common carriers
b. Router manufacturers
c. Standards organizations
d. CSUs
e. PUCs


Answer: A

ARQ means that:

ARQ means that: 

a. a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error
b. the common carrier Automatically Returns Queries to the subscriber upon receipt of such queries
c. a sender is using a data link protocol called Asynchronous Repeating reQuest
d. a fiber optic cable meets the American Registered Quality, a certification standard for use in high-quality data communication transmission lines
e. a sender is using a parity scheme called Array Resource Quality



Answer: A

Which of the following is not a property of a WAN:

Which of the following is not a property of a WAN:

a. connects backbone networks and MANS.
b. spans hundreds or thousands of miles
c. provides data transmission speeds from 56Kbps to 10Gbps.
d. connects a group of computers in a small geographic area such as room, floor, building or campus.
e. uses lease lines from IXCs like ATT, MCI, Sprint.


Answer: D

A metropolitan area network is:

A metropolitan area network is:

a. a high speed central network, built with privately owned media, which connects other networks in a distance spanning up to several miles.
b. a group of microcomputers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.
c. a network that spans a geographical area that usually encompasses a city or county area (3 to 30 miles) and that typically uses common carrier circuits.
d. a network spanning a large geographical area (up to 1000s of miles).
e. a network spanning exactly 543.56 miles with private media.



Answer: C

Devices in a rack are connected together using ___________.

Devices in a rack are connected together using ___________. 

a.) patch cables
b.) string
c.) servers
d.) modules
e.) chassis switches


Answer: A

With a switched backbone network, the equipment is usually placed in a ______.

With a switched backbone network, the equipment is usually placed in a ______.

a.) server
b.) NIC
c.) cabinet
d.) basement
e.) rack



Answer: E

Which of the following is true regarding switched backbones?

Which of the following is true regarding switched backbones?

a. They place all network devices for one part of the building physically in the same room, often in a rack of equipment
b. They have an advantage of requiring less cable
c. They make it more difficult to move computers from one LAN to another
d. Network capacity is always tied to the physical location of the computers
e. They are harder to maintain and upgrade than a BN that is not rack-based



Answer: A

Which of the following can connect two different networks that utilize the same or different data link and network layer protocols as well as the same or different cable type?

Which of the following can connect two different networks that utilize the same or different data link and network layer protocols as well as the same or different cable type?

a.) Switch
b.) Router
c.) Gateway
d.) Hub
e.) NIC



Answer: C

Which of the following devices is the most complex?

Which of the following devices is the most complex? 

a. Gateway
b. Router
c. Layer 3 switches
d. Switch
e. Multiprotocol router



Answer: A

Gateways:

Gateways: 

a. process all messages, even if the messages are not explicitly addressed to them
b. can translate one network protocol into another
c. are less complex than bridges
d. are most often used as the interface between two or more networks that have similar data link and network layer protocols
e. cannot perform a routing function



Answer: B

Which of the following is not a way that a router differs from a switch?

Which of the following is not a way that a router differs from a switch? 

a. routers can connect two or more networks that use the same data link protocol
b. routers only process messages that are specifically addressed to it
c. routers operate at the network layer
d. routers perform more processing on each message than switch
e. routers can choose the "best" route between networks for forwarding a packet


Answer: A

Routers:

Routers: 

a. operate at the application layer
b. operate only at the physical layer
c. cannot connect two or more networks that use the same type of cable
d. may also be called TCP/IP gateways
e. operate only at the data link layer


Answer: D

Which of the following is not true about switched backbones?

Which of the following is not true about switched backbones?

a. performance is improved over traditional (bridged or routed) backbone networks
b. each connection into the switch is a separate point-to-point circuit which supports simultaneous access by the LANs connected to the switch
c. there are many more networking devices in a switched backbone network
d. if the switch fails, so does the entire backbone network
e. the backbone essentially exists in the switch; there is no backbone cable



Answer: C

Which of the following is not a type of hardware device that can be used to interconnect networks?

Which of the following is not a type of hardware device that can be used to interconnect networks? 

a. switches
b. routers
c. multiprotocol routers
d. 'dumb' terminals
e. gateways



Answer: D

Which of the following type of media is most commonly used in backbone networks because of its high capacity?

Which of the following type of media is most commonly used in backbone networks because of its high capacity? 

a. fiber
b. infrared frequencies
c. coax cable
d. unshielded twisted pair
e. shielded twisted pair


Answer: A

A backbone network is:

A backbone network is:

a. a high speed central network that connects other networks in a distance spanning up to several miles.
b. a group of microcomputers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.
c. a network spanning a geographical area that usually encompasses a city or county area (3 to 30 miles).
d. a network spanning a large geographical area (up to 1000s of miles).
e. a network spanning exactly 200 miles with common carrier circuits.



Answer: A

A star topology is:

A star topology is: 

a. difficult to manage because the central computer receives and routes all messages in the network
b. dependent upon the capacity of the central computer for its performance
c. always slower than a ring network
d. less susceptible to traffic problems than other architectures
e. not affected if the central computer fails



Answer: B

Each of the circuits connected to a switch is a separate _______________ circuit connecting the switch to a device on the network.

Each of the circuits connected to a switch is a separate _______________ circuit connecting the switch to a device on the network.

a. multipoint
b. point-to-point
c. shared
d. ring
e. star



Answer: B

A(n) ___________ is a radio transceiver that plays the same role as a hub or switch in a wired network and connects the WLAN to the wired network.

A(n) ___________ is a radio transceiver that plays the same role as a hub or switch in a wired network and connects the WLAN to the wired network.

a. Ethernet NIC
b. antennae
c. wireless NIC
d. access point
e. hub



Answer: D

A(n) _____________ is required to connect a computer to WLAN.

A(n) _____________ is required to connect a computer to WLAN.

a. Ethernet NIC
b. antennae
c. wireless NIC
d. access point
e. hub



Answer: C

Which of the following is not an advantage of a WLAN?

Which of the following is not an advantage of a WLAN?

a. The ability to use the network in places where it is impractical to install a wired network.
b. WLANs enable mobile users to work at different locations within an office building and stay connected to the network.
c. WLANs enable business travelers to connect the Internet from within waiting areas.
d. WLANs allow users to work more securely than a wired LAN.
e. WLANs cost less to install and operate in most cases (except new buildings) than wired networks.



Answer: D

Which of the following is not a way to reduce network demand?

Which of the following is not a way to reduce network demand? 

a. shifting network usage from high cost times to lower cost times
b. using data compression techniques for all data in the network
c. requiring a network impact statement for all application software developed by the organization
d. moving data further from the applications and people who use them
e. shifting network usage from peak to lower demand times



Answer: D

Network demand will not be reduced by:

Network demand will not be reduced by:

a. restricting (or moving) applications such as desktop videoconferencing
b. using network devices to ensure that broadcast messages do not go to other networks
c. encouraging the use of applications such as medical imaging
d. sending status information to all computers on all LANs in the backbone network
e. restricting (or moving) applications such as multimedia



Answer: C

Which of the following is not an effective way to reduce LAN network demand:

Which of the following is not an effective way to reduce LAN network demand: 

a. move files to client computers
b. use disk caching on the client machines
c. find an application that places a large demand on the network and run it a time when the network is lightly loaded
d. add hidden nodes
e. shift the users' routines



Answer: D

Which of the following can provide fault tolerance for the storage space on a server?

Which of the following can provide fault tolerance for the storage space on a server?

a. RAID
b. SCSI
c. IDE
d. USB
e. EIDE



Answer: A

Which of the following is not true about switched Ethernet?

Which of the following is not true about switched Ethernet? 

a. The switch has a physical bus topology.
b. It uses a switch instead of a hub.
c. It has faster connections (almost immediate) than traditional Ethernet.
d. It essentially provides a point-to-point connection between computers.
e. It has forwarding tables in which entries are learned over time.



Answer: A

Switched Ethernet:

Switched Ethernet: 

a. uses a hub to connect computers
b. has a physical topology of a ring
c. has a logical topology of a ring
d. has a logical topology of a bus
e. usually enables all attached circuits to send or receive packets simultaneously



Answer: E

Switched Ethernet:

Switched Ethernet:

a. always has a lower capacity than shared Ethernet.
b. operates at 50% of capacity before performance becomes a problem.
c. operates at about 95% of capacity before performance becomes a problem.
d. is affected by the increased collisions caused by using a switched LAN design.
e. decreases network performance because each computer is connected via a common multipoint circuit.



Answer: C

CSMA/CA is an acronym for:

CSMA/CA is an acronym for:

a. Carrier Sense Multiple Access with Collision Acknowledgment
b. Carrier Sense Mode Access with Carrier Avoidance
c. Carrier Sense Multiple Access with Collision Avoidance
d. Carrier Sensory Multiple Access without Collision Acknowledgment
e. Carrier Sense Multiple Acknowledgment with Collision Avoidance



Answer: C

Which of the following is not a controlled access method of media access control?

Which of the following is not a controlled access method of media access control? 

a. Token passing
b. CSMA/CD
c. polling
d. roll call polling
e. hub polling



Answer: B

Which of the following is not true about CSMA/CD?

Which of the following is not true about CSMA/CD? 

a. The acronym refers to Carrier Sense Multiple Access with Collision Detection
b. It is used in token ring protocol LANs
c. It is a contention-based media access control technique
d. When a collision has occurred, the computers that wish to transmit wait a random amount of time after a colliding message before attempting to retransmit
e. Computers on the circuit 'listen' before transmitting


Answer: B

A logical bus topology:

A logical bus topology: 

a. is always used by token ring protocol LANs
b. has all computers connected to each other in point-to-point connections
c. is limited to short distances since devices like a hub or repeater cannot be used with this type of topology
d. permits every message to be received by every computer on the bus, even when those messages are intended for other computers
e. has a central control device, such as a mainframe



Answer: D

The type of logical topology that Ethernet uses is a:

The type of logical topology that Ethernet uses is a: 

a. ring
b. bus
c. star
d. mesh
e. interconnected



Answer: B

_________ is how the network works conceptually.

_________ is how the network works conceptually.

a. Physical topology
b. Logical topology
c. Network topology
d. Ethernet
e. Media access control



Answer: B

Ethernet LAN was developed by:

Ethernet LAN was developed by: 

a. IBM
b. ARPANET
c. DEC, Xerox, and Intel
d. University of Minnesota
e. CERN laboratory in Geneva



Answer: C

Which of the following is true about the data link protocol, Ethernet (IEEE 802.3)?

Which of the following is true about the data link protocol, Ethernet (IEEE 802.3)?

a. it is not very popular
b. it is a bit-oriented protocol
c. it uses block check characters for error detection
d. newer version permits jumbo frames
e. it uses parity bits for error detection



Answer: D

_____ provide information about resources on the network that are available to the users, such as shared printers, file servers and application software.

_____ provide information about resources on the network that are available to the users, such as shared printers, file servers and application software.

a. Network Services
b. Directory Services
c. Client Services
d. Computing Services
e. Remote Access Services



Answer: B

A __________ indicates what resources on each server are available on the network for use by other computers and what people are allowed what access to the network.

A __________ indicates what resources on each server are available on the network for use by other computers and what people are allowed what access to the network.

a. user profile
b. user access log
c. network profile
d. network operating system
e. server allocation list



Answer: C

The server version of the Network Operating System does not:

The server version of the Network Operating System does not: 

a. provide the software that performs the functions associated with the physical layer
b. provide the software that performs the functions associated with the data link layer
c. provide the software that performs the functions associated with the application layer
d. provide the software that performs the functions associated with the network layer
e. usually provide the software that performs the functions associated with the computer's own operating system



Answer: A

_______ is the software that controls the network.

_______ is the software that controls the network.

a. Network Operating System
b. Client Operating System
c. Embedded Operating System
d. Network Control System
e. Network Software System



Answer: A

Which of the following is not a critical software component in a dedicated server LAN?

Which of the following is not a critical software component in a dedicated server LAN? 

a. application software on server computers
b. network operating system in the dedicated server
c. network communication software on the client
d. LAN metering software
e. application software on client computers



Answer: D

A(n) _____________ is required to connect a computer to WLAN.

A(n) _____________ is required to connect a computer to WLAN.

a. Ethernet NIC
b. antennae
c. wireless NIC
d. access point
e. hub


Answer: C

Which of the following is not a basic LAN component?

Which of the following is not a basic LAN component? 

a. client
b. PAD
c. server
d. network interface card
e. network operating system



Answer: B

A peer-to-peer LAN:

A peer-to-peer LAN: 

a. has more capability than a dedicated server
b. supports a higher number of computers than a dedicated server
c. is generally cheaper in hardware and software than a dedicated server
d. is not appropriate for sharing resources in a small LAN
e. is often much faster than dedicated server networks



Answer: C

Networks that are designed to connect similar computers that share data and software with each other are called:

Networks that are designed to connect similar computers that share data and software with each other are called:

a. client/server networks
b. peer-to-peer networks
c. host networks
d. client networks
e. local area networks



Answer: B

________ refers to one computer legally sharing a software package, such as Microsoft Word, with other computers on the network to save costs.

________ refers to one computer legally sharing a software package, such as Microsoft Word, with other computers on the network to save costs.

a. Software metering
b. Information sharing
c. Resource sharing
d. Software pirating
e. Network routing


Answer: C

_______ refers to having users access the same data files, exchange information via electronic mail, or search the Internet for information.

_______ refers to having users access the same data files, exchange information via electronic mail, or search the Internet for information.

a. Resource sharing
b. User grouping
c. User profiling
d. Information sharing
e. Data pirating



Answer: D

One drawback to dynamic routing is:

One drawback to dynamic routing is: 

a. Routing usually does not reflect changing network conditions, such as computers that are overloaded by many messages
b. It cannot be used with non-government networks
c. The transmission of status information "wastes" network capacity that could be used to send user messages
d. It is the job of the network manager, not the computers or devices themselves, to maintain the routing table.
e. It requires less processing by each computer than static routing.



Answer: C

_____ is a type of dynamic routing.

_____ is a type of dynamic routing. 

a. Static routing
b. Circuitous routing
c. Centralized routing
d. Link state
e. X.25 routing



Answer: D

______ refers to the type of routing in which the routing table is developed by the network manager and modifications are made only when computers are added to or removed from the network.

______ refers to the type of routing in which the routing table is developed by the network manager and modifications are made only when computers are added to or removed from the network. 

a. Adaptive routing
b. Dynamic routing
c. Static routing
d. Distance vector routing
e. Link state routing



Answer: C

An advantage of centralized routing is:

An advantage of centralized routing is: 

a. routing does reflect changing network conditions, such as computers that are overloaded by many messages
b. if anything happens to the computer developing the routing table, the routing tables cannot be changed until that computer is fixed, or until a new computer is selected to perform the function
c. routing decisions are simple
d. the routing tables are stored at all computers in the network
e. it requires more processing by each computer or router in the network than dynamic routing


Answer: C

The three fundamental approaches to routing are:

The three fundamental approaches to routing are: 

a. circuitous, flat, and direct routing
b. connectionless, static, and connection-oriented
c. subordinate, master, and insubordinate routing
d. host, client, and client-server routing
e. centralized, static routing, and dynamic routing



Answer: E

In its simplest form, the __________ has two columns: the first column lists every computer and device in the network, while the second column lists the computer or device to which that computer should send messages, if they are destined for the computer in the first column.

In its simplest form, the __________ has two columns: the first column lists every computer and device in the network, while the second column lists the computer or device to which that computer should send messages, if they are destined for the computer in the first column. 

a. linking loader
b. routing table
c. configuration listing
d. bus header assignment list
e. file allocation table



Answer: B

_______ is the process of determining the path that a message will travel from sending computer to receiving computer.

_______ is the process of determining the path that a message will travel from sending computer to receiving computer. 

a. Routing
b. Addressing
c. Interfacing
d. Broadcasting
e. Packetizing



Answer: A

When TCP/IP translates an application layer address into an IP address, it sends a special __________ to the nearest DNS server.

When TCP/IP translates an application layer address into an IP address, it sends a special __________ to the nearest DNS server. 

a. broadcast message
b. DNS request packet
c. SNA packet
d. IPX message
e. X.25 packet



Answer: B

Which of the following is not given to a client computer when it is first installed on a TCP/IP network so that it has the appropriate routing/addressing information?

Which of the following is not given to a client computer when it is first installed on a TCP/IP network so that it has the appropriate routing/addressing information? 

a. application layer address
b. subnet mask
c. its own IP address
d. IP address of its DNS server
e. IP address of a gateway, router, or a switch outside of its subnet



Answer: A

A special type of message that is used when sending the same message to all computers on a specific LAN or subnet is called a:

A special type of message that is used when sending the same message to all computers on a specific LAN or subnet is called a: 

a. unicast message
b. multicast message
c. broadcast message
d. guided message
e. radiated message


Answer: C

When TCP/IP translates a network layer address into a data link layer address, it sends a special ____________ to all computers in the subnet.

When TCP/IP translates a network layer address into a data link layer address, it sends a special ____________ to all computers in the subnet. 

a. physical layer packet
b. multicast message
c. X.25 message
d. broadcast message
e. application layer packet



Answer: D

Dynamic addressing:

Dynamic addressing: 

a. assigns a permanent network layer address to a client computer in a network
b. makes network management more complicated in dial-up networks
c. has only one standard, bootp
d. is always performed for servers only
e. can solve many updating headaches for network managers who have large, growing, changing networks



Answer: E

A subnet mask of ___________ means that all computers with only the same first two bytes in their IPv4 addresses are on the same subnet.

A subnet mask of ___________ means that all computers with only the same first two bytes in their IPv4 addresses are on the same subnet. 

a. 11111111.0.0.0
b. 255.255.255.0
c. 255.0.0.0
d. 255.255.0.0
e. 255.255.255.255



Answer: D

A(n) ________ refers to a group of computers that are logically grouped together by IP number.

A(n) ________ refers to a group of computers that are logically grouped together by IP number. 

a. IPv6 group
b. subnet
c. data link group
d. TCP group
e. application net



Answer: B

______ is a specially formatted request used to perform IP address to data link address resolution.

______ is a specially formatted request used to perform IP address to data link address resolution. 

a. Address Resolution Protocol
b. Domain Service Request
c. HTTP request
d. Link state request
e. Autonomous System Request



Answer: A

Server name resolution is done using the:

Server name resolution is done using the:

a. Address Resolution Protocol
b. Border Gateway Protocol
c. Internet Control Message Protocol
d. Routing Information Protocol
e. Domain Name Service



Answer: E

_______ is the translation of application layer addresses into IP addresses.

_______ is the translation of application layer addresses into IP addresses. 

a. Network interface card reversal
b. IPv6
c. Server name resolution
d. Subnet masking
e. Name service coding



Answer: C

A client computer is assigned a data link layer address is by:

A client computer is assigned a data link layer address is by: 

a. hardware manufacturers
b. software manufacturers
c. middleware manufacturers
d. network managers who configure a file in a computer's network layer software package
e. ISO



Answer: A

With QoS routing different __________ are defined, each with different priorities.

With QoS routing different __________ are defined, each with different priorities. 

a. classes of service
b. domain names
c. application layer addresses
d. data link layer addresses
e. classes of Internet addresses


Answer: A

With __________ ARQ, the sender immediately sends the next message or packet of data.

With __________ ARQ, the sender immediately sends the next message or packet of data. 

a. continuous
b. immediate
c. open window
d. stop-and-wait
e. halt and be recognized (HBR)



Answer: A

A _________ is a connection-oriented approach to sending packets on a packet switched service.

A _________ is a connection-oriented approach to sending packets on a packet switched service.

a. permanent virtual circuit
b. datagram
c. histogram
d. bursty packet
e. fractional T-1 network



Answer: A

The three fundamental approaches to routing are:

The three fundamental approaches to routing are: 

a. circuitous, flat, and direct routing
b. connectionless, static, and connection-oriented
c. subordinate, master, and insubordinate routing
d. host, client, and client-server routing
e. centralized, static routing, and dynamic routing



Answer: E

____ routing is most commonly used when the application data or message can fit into one single packet.

____ routing is most commonly used when the application data or message can fit into one single packet.

a. Frame-oriented
b. Connection-oriented
c. Connectionless
d. Physical-oriented
e. Byte-oriented



Answer: C

In connection-oriented routing, the _________ layer sets up a virtual circuit between the sender and the receiver.

In connection-oriented routing, the _________ layer sets up a virtual circuit between the sender and the receiver. 

a. transport
b. network
c. physical
d. data link
e. connection



Answer: A

_______ routing is a method of routing in which each packet makes its own way through the network.

_______ routing is a method of routing in which each packet makes its own way through the network. 

a. Frequency division
b. Connection-oriented
c. PCMCIA
d. Connectionless
e. Application net



Answer: D

A virtual circuit is established in the ___________ routing method.

A virtual circuit is established in the ___________ routing method. 

a. asynchronous
b. connection-oriented
c. frequency division
d. application net
e. connectionless



Answer: B

The older version of IP has a ________ header of control information.

The older version of IP has a ________ header of control information. 

a. 128-bit
b. 192-bit
c. 1024-bit
d. 160-bit
e. 320-bit



Answer: B

The newer form of IP, version 6 (Ipv6) is:

The newer form of IP, version 6 (Ipv6) is: 

a. running out of address space to support the growth of the Internet
b. has a 20 byte header
c. has an increased address size from 32 bits to 128 bits
d. does not include version number in its header
e. does not include hop limit in its header




Answer: C

TCP uses _____________ so that the destination station can reassemble the packets into the correct order.

TCP uses _____________ so that the destination station can reassemble the packets into the correct order.

a. IP addresses
b. sequence numbers
c. port numbers
d. packet numbers
e. reassembly value



Answer: B

The source destination port identifier tells the destination station _____________.

The source destination port identifier tells the destination station _____________.

a. which computer sent the TCP packet.
b. which application layer program that the packet should be sent
c. which application layer process the packet is from.
d. the IP address of the source computer.
e. the IP address of the destination computer.



Answer: C

A typical TCP packet has a _______ header of control information.

A typical TCP packet has a _______ header of control information. 

a. 32-bit
b. 64-bit
c. 160-bit
d. 192-bit
e. 32-byte



Answer: D

TCP/IP:

TCP/IP: 

a. is the least commonly used network protocol for LANs because it cannot be combined with Ethernet
b. performs packetizing, as well as routing and addressing functions
c. is not very efficient and is prone to errors
d. is compatible with only one type of data link protocol, SDLC
e. refers to Telephone Control Procedures/Inter-exchange Procedures



Answer: B

The negotiation by the transport layer at the sender with the transport layer at the receiver to determine what size packets should be set up is done via establishing a(n) ___________ between the sender and receiver.

The negotiation by the transport layer at the sender with the transport layer at the receiver to determine what size packets should be set up is done via establishing a(n) ___________ between the sender and receiver.

a. network layer address resolution
b. one way handshake
c. SNA message
d. TCP connection
e. DNS server request



Answer: D

IP:

IP: 

a. performs packetizing functions
b. does not have a header
c. is currently in use with only one packet form or structure
d. performs routing functions
e. performs error control functions



Answer: D

Transmission Control Protocol/Internet Protocol was developed for ________ in 1974.

Transmission Control Protocol/Internet Protocol was developed for ________ in 1974. 

a. ARPANET
b. IBM
c. Hewlett-Packard
d. University of Minnesota
e. Xerox



Answer: A

______ is the dominant network protocol today.

______ is the dominant network protocol today. 

a. SDLC
b. SNA
c. IPX/SPX
d. TCP/IP
e. X.25


Answer: D

The ____________ layer links the application layer with the network layer is responsible for end-to-end delivery of messages.

The ____________ layer links the application layer with the network layer is responsible for end-to-end delivery of messages.

a. physical
b. transport
c. session
d. presentation
e. data link



Answer: B

As part of the five-layer network model used in this textbook, the data link layer sits directly between:

As part of the five-layer network model used in this textbook, the data link layer sits directly between: 

a. the physical and the application layers
b. the network and the application layers
c. the network and transport layers
d. the physical and the application layers
e. the physical and the network layers



Answer: E

The network layer of the Internet model uses the _____________ protocol to route messages though the network.

The network layer of the Internet model uses the _____________ protocol to route messages though the network.

a. TCP
b. HTTP
c. FTP
d. SMTP
e. IP



Answer: E

The _________ layer is responsible for routing of messages from the sender to the final destination.

The _________ layer is responsible for routing of messages from the sender to the final destination.

a. data communication layer
b. resident layer
c. application layer
d. network layer
e. physical layer



Answer: D

Breaking a network into smaller parts is called network:

Breaking a network into smaller parts is called network: 

a. fragmentation
b. segmentation
c. localization
d. allocation
e. mitigation



Answer: B

In connection-oriented routing, the _________ layer sets up a virtual circuit between the sender and the receiver.

In connection-oriented routing, the _________ layer sets up a virtual circuit between the sender and the receiver. 

a. transport
b. network
c. physical
d. data link
e. connection



Answer: A

A virtual circuit is established in the ___________ routing method.

A virtual circuit is established in the ___________ routing method. 

a. asynchronous
b. connection-oriented
c. frequency division
d. application net
e. connectionless



Answer: B

What size packets should be set up is done via establishing a(n) ___________ between the sender and receiver.

What size packets should be set up is done via establishing a(n) ___________ between the sender and receiver.

a. network layer address resolution
b. one way handshake
c. SNA message
d. TCP connection
e. DNS server request


Answer: D

The transport layer must break messages from the application layer into several _____ that can be sent to the data link layer.

The transport layer must break messages from the application layer into several _____ that can be sent to the data link layer.

a. bits
b. bytes
c. frames
d. packets
e. strings



Answer: D

_______ is not an important function of the transport layer.

_______ is not an important function of the transport layer. 

a. end-to-end delivery of the message
b. taking messages from the application layer
c. routing
d. breaking long messages into smaller packets
e. interfacing with the network layer



Answer: C

Which of the following is a function of the transport layer?

Which of the following is a function of the transport layer?

a. linking the physical layer to the network layer
b. formatting messages by indicating where they start and end
c. deciding which route the message should take
d. breaking long messages into several smaller messages
e. specifying the type of connection and the electrical signals, radio waves, or light pulses that pass through it



Answer: d

Which layer of the OSI model is responsible for ensuring flow control so that the destination station does not receive more packets that it can process at any given time?

Which layer of the OSI model is responsible for ensuring flow control so that the destination station does not receive more packets that it can process at any given time?

a. presentation Layer
b. transport Layer
c. physical Layer
d. session Layer
e. application Layer



Answer: B

Which layer of the OSI model is responsible for ensuring that all packets sent are received by the destination station by dealing with end-to-end issues?

Which layer of the OSI model is responsible for ensuring that all packets sent are received by the destination station by dealing with end-to-end issues?

a. presentation Layer
b. transport Layer
c. physical Layer
d. session Layer
e. application Layer


Answer: B

Ethernet LAN was developed by:

Ethernet LAN was developed by: 

a. IBM
b. ARPANET
c. DEC, Xerox, and Intel
d. University of Minnesota
e. CERN laboratory in Geneva


Answer: C

Which of the following is true about the data link protocol, Ethernet (IEEE 802.3)?

Which of the following is true about the data link protocol, Ethernet (IEEE 802.3)?

a. it is not very popular
b. it is a bit-oriented protocol
c. it uses block check characters for error detection
d. newer version permits jumbo frames
e. it uses parity bits for error detection



Answer: D

Which of the following would be a standard used at the Data Link layer of the Internet or OSI model?

Which of the following would be a standard used at the Data Link layer of the Internet or OSI model?

a. IP
b. TCP
c. Ethernet
d. HTTP
e. FTP



Answer: C

A special packet called a(n) _____________ packet is sent to the receiver requesting the establishment of a connection.

A special packet called a(n) _____________ packet is sent to the receiver requesting the establishment of a connection.

a. ACK
b. NAK
c. SYN
d. ARQ
e. FIN



Answer: C

Synchronous transmission:

Synchronous transmission: 

a. cannot be used on multipoint circuits
b. is used to send one character at a time
c. uses start bits before each character to be sent
d. uses stop bits after each character to be sent
e. is used to transmit a "frame" or "packet" of data at a time



Answer: E

Asynchronous transmission:

Asynchronous transmission: 

a. is used to transmit each character simultaneously with all other characters
b. has a pre-determined, fixed time between sending characters
c. is typically used on multipoint half duplex circuits
d. uses a continuous series of start bits as an idle signal
e. is also known as start-stop transmission



Answer: E

With __________ ARQ, the sender immediately sends the next message or packet of data.

With __________ ARQ, the sender immediately sends the next message or packet of data. 

a. continuous
b. immediate
c. open window
d. stop-and-wait
e. halt and be recognized (HBR)



Answer: A

With __________ ARQ, the sender pauses for a response from the receiver to alter each message or packet of data.

With __________ ARQ, the sender pauses for a response from the receiver to alter each message or packet of data. 

a. open window
b. halt and be recognized (HBR)
c. sliding window
d. stop and wait
e. continuous



Answer: D

______ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

______ controls errors by detecting and correcting them at the receiving end without retransmission of the original message. 

a. Hamming code
b. Huffman encoding
c. Front end processing
d. Wave division multiplexing
e. Hub polling



Answer: A

ARQ means that:

ARQ means that: 

a. a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error
b. the common carrier Automatically Returns Queries to the subscriber upon receipt of such queries
c. a sender is using a data link protocol called Asynchronous Repeating reQuest
d. a fiber optic cable meets the American Registered Quality, a certification standard for use in high-quality data communication transmission lines
e. a sender is using a parity scheme called Array Resource Quality



Answer: A

Using parity, the probability for detecting an error, given that one has occurred, is:

Using parity, the probability for detecting an error, given that one has occurred, is: 

a. about 50% for either even or odd parity
b. about 70% for even parity and 30% for odd parity
c. about 30% for even parity and 70% for odd parity
d. about 0% for either even or odd parity
e. about 100% for either even or odd parity


Answer: A

The probability of detecting an error, given that one has occurred, using parity checking is about:

The probability of detecting an error, given that one has occurred, using parity checking is about:

a. 100%
b. 0%
c. 50%
d. 75%
e. 98%


Answer: C

With odd parity (assume that the parity bit (in bold) has been placed at the end of each of the following) and a 7-bit ASCII code, which of the following is incorrect?

With odd parity (assume that the parity bit (in bold) has been placed at the end of each of the following) and a 7-bit ASCII code, which of the following is incorrect? 

a. 0110101 1
b. 0001101 1
c. 0010010 1
d. 1011011 0
e. 1111111 0



Answer: B

On digital circuits, we use _________ to reshape the incoming signal and prevent attenuation.

On digital circuits, we use _________ to reshape the incoming signal and prevent attenuation.

a. amplifiers
b. repeaters
c. multiplexers
d. digitizers
e. modems



Answer: B

Which of the following is way to reduce or eliminate crosstalk on a circuit,

Which of the following is way to reduce or eliminate crosstalk on a circuit,

a. changing multiplexing techniques
b. adding repeaters or amplifiers to a circuit
c. reducing the length of the cable
d. adding fluorescent lights
e. shorting a circuit



Answer: A

______ is an effective way to prevent attenuation.

______ is an effective way to prevent attenuation. 

a. Shielding wires
b. Adding fluorescent lights
c. Adding repeaters or amplifiers to a circuit
d. Changing multiplexing techniques
e. Shorting a circuit


Answer: C

_______ is an effective way to prevent impulse noise, cross talk, and intermodulation noise.

_______ is an effective way to prevent impulse noise, cross talk, and intermodulation noise. 

a. Shielding wires
b. Adding fluorescent lights
c. Adding repeaters to a circuit
d. Adding amplifiers to a circuit
e. Shorting a circuit



Answer: A

A phase hit is likely to be:

A phase hit is likely to be: 

a. spikes
b. a short term shift out of phase
c. intermodulation noise
d. white noise
e. Gaussian noise



Answer: B

When the output signal from an amplifier on a circuit is different from the input signal, this is called _________________.

When the output signal from an amplifier on a circuit is different from the input signal, this is called _________________.

a. intermodulation noise
b. attenuation
c. echo
d. jitter
e. harmonic distortion


Answer: E

If a signal with a frequency of 500 MHz combines with a another signal of 1500 MHz and they form a new signal of 2000 MHz; this is an example of:

If a signal with a frequency of 500 MHz combines with a another signal of 1500 MHz and they form a new signal of 2000 MHz; this is an example of:

a. intermodulation noise
b. attenuation
c. echo
d. jitter
e. harmonic distortion


Answer: A

The loss of power a signal suffers as it travels from the transmitting computer to a receiving computer is:

The loss of power a signal suffers as it travels from the transmitting computer to a receiving computer is: 

a. jitter
b. spiking
c. attenuation
d. intermodulation noise
e. echo



Answer: C

When a signal is reflected back to the transmitting equipment, it is called a(n) _________.

When a signal is reflected back to the transmitting equipment, it is called a(n) _________.

a. jitter
b. echo
c. crosstalk
d. attenuation
e. impulse noise



Answer: B

Cross-talk:

Cross-talk: 

a. occurs when one circuit picks up signals in another
b. is always bothersome because it has a high signal strength
c. decreases with increased proximity of two wires
d. decreases during wet or damp weather
e. increases with lower frequency signals


Answer: A

_______can obliterate a group of bits, causing a burst error.

_______can obliterate a group of bits, causing a burst error.

a. Crosstalk
b. Attenuation
c. Impulse noise
d. Intermodulation noise
e. Jitter



Answer: C

The primary source of error in data communications is:

The primary source of error in data communications is: 

a. echoes
b. intermodulation noise
c. spikes
d. jitter
e. cross-talk


Answer: C

The familiar background static on radios and telephones is called:

The familiar background static on radios and telephones is called: 

a. echoes
b. intermodulation noise
c. line outages
d. cross-talk
e. white noise



Answer: E

Another term for impulse noise is:

Another term for impulse noise is: 

a. Gaussian noise
b. spikes
c. attenuation
d. cross-talk
e. intermodulation noise


Answer: B

Errors on a network can occur:

Errors on a network can occur: 

a. only on dial-up type of circuits
b. because of noise on the line
c. only on poorly maintained networks
d. only due to Gaussian noise
e. only due to lightning strikes


Answer: B

With contention:

With contention: 

a. computers wait until the circuit is free before they send data
b. the server or front end processor works consecutively through a list of clients to determine who should have access to the media
c. the front end processor must wait for a response from the polled client or terminal
d. one computer starts the poll and passes it to the next computer on the multipoint circuit
e. there is never a chance for "collision," or two computers trying to send data at the same time


Answer: A

Which of the following is not true about CSMA/CD?

Which of the following is not true about CSMA/CD? 

a. The acronym refers to Carrier Sense Multiple Access with Collision Detection
b. It is used in token ring protocol LANs
c. It is a contention-based media access control technique
d. When a collision has occurred, the computers that wish to transmit wait a random amount of time after a colliding message before attempting to retransmit
e. Computers on the circuit 'listen' before transmitting


Answer: B

Which of the following is true about roll call polling?

Which of the following is true about roll call polling? 

a. It can not be modified to increase priority of clients or terminals.
b. It does not require a server or host or special device that performs the polling.
c. It is also called token passing.
d. It is a type of contention approach to media access control.
e. It typically involves some waiting because the server has to wait for a response from the polled client or terminal.


Answer: E