Archive for October 2017

Media access control:

Media access control: 



a. is not very important in point-to-point with full duplex configuration
b. is not very important in local area networks
c. is not very important in a point-to-point with a half duplex configuration
d. is not very important in a multipoint configuration
e. does not control when computers transmit


Answer: A

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

Media access control refers to:

Media access control refers to:




a. the price of fiber optic cable
b. security over floppy disks in a user environment
c. the ability for a user to use multimedia equipment in a LAN
d. controlling access to a media by more than one computer in a LAN
e. the control over coax cable installed by a cable service provider



Answer: D

In general, controlled approaches:

In general, controlled approaches: 



a. work better than contention approaches for small networks that have low usage
b. work better than contention approaches for large networks that have high usage
c. work better than contention approaches for all sizes of networks
d. do not require a host, server, or active monitor to assign media access control
e. have many collisions



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

________ is not a function of a data link protocol.

________ is not a function of a data link protocol.




a. Media access control
b. Message delineation
c. Amplitude shift keying
d. Indicating when a message starts and stops
e. Error control



Answer: C

Inverse multiplexing means:

Inverse multiplexing means: 



a. combining several low speed circuits to enable them to be transmitted across one high speed circuit
b. multiplexing from the terminal to the host, rather than from the host to the terminal
c. combining high speed circuits to enable them to be transmitted across one low speed circuit
d. inverting the frequencies used for transmission across a low speed circuit for switching to a digital circuit
e. multiplexing to a codec, rather than to a modem


Answer: A

Frequency division multiplexing:

Frequency division multiplexing: 



a. operates by statistically time slicing the signal
b. operates by dividing the signal into different frequencies
c. uses a codec that divides signals into different channels
d. operates by time slicing the signal
e. operates by light dividing the signal



Answer: B

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a: 




a. wavelength division multiplexer
b. time division multiplexer
c. statistical time division multiplexer
d. frequency division multiplexer
e. statistical frequency division multiplexer



Answer: A

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a: 




a. wavelength division multiplexer
b. time division multiplexer
c. statistical time division multiplexer
d. frequency division multiplexer
e. statistical frequency division multiplexer



Answer: A

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a: 




a. wavelength division multiplexer
b. time division multiplexer
c. statistical time division multiplexer
d. frequency division multiplexer
e. statistical frequency division multiplexer



Answer: A

The direction in which the sound wave begins is known as:

The direction in which the sound wave begins is known as:



a. amplitude, which our ears detect as loudness
b. frequency, which our ears detect as pitch
c. phase
d. bandwidth
e. furlong



Answer: C

_______ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.

_______ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.



a. quadrature amplitude modulation
b. time division multiplexing
c. synchronous digital line control
d. pulse code modulation
e. baseband signaling



Answer: A

_______ is not a type of digital signaling technique.

_______ is not a type of digital signaling technique.




a. Non-return-to-zero signaling
b. Unipolar signaling
c. Manchester encoding
d. Return-to-zero signaling
e. Data rate signaling



Answer: E

Which of the following statements is correct?

Which of the following statements is correct?




a. Parallel transmission is most often used for sending data on a circuit that is made up of one wire.
b. Parallel transmission is distinguished from serial transmission by the fact that the transmitting device sends a single bit, then a second bit, and so on, until all the bits are transmitted.
c. Parallel transmission is only used for analog data.
d. Serial transmission is slower than parallel transmission.
e. Parallel transmission is the same as serial transmission.



Answer: D

Microwave transmission:

Microwave transmission: 



a. is a type of high frequency radio communication
b. requires a clear line-of-sight path
c. is typically used for long distance data transmission
d. does not require the laying of any cable
e. all of the above



Answer: E

Which of the following is not a function of the data link layer?

Which of the following is not a function of the data link layer?




a. deciding when to transmit messages over the media
b. formatting the message by indicating where messages start and end, and which part is the address
c. detecting and correcting any errors that have occurred in the transmission of the message
d. specifying the type of connection, and the electrical signals, radio waves, or light pulses that pass through it
e. controlling the physical layer by determining when to transmit



Answer: d

Of the following, which is not true about fiber optic cable?

Of the following, which is not true about fiber optic cable?



a. it is thinner than unshielded twisted pair cable
b. it is lighter than unshielded twisted pair cable
c. it has a very low capacity
d. it is more expensive than CAT5 unshielded twisted pair cable
e. it is a type of guided media



Answer: C

The two basic types of media are:

The two basic types of media are: 



a. statistical and frequency
b. guided and wireless (radiated)
c. local and wide area
d. attenuator and Gaussian
e. duplexed and non-duplexed


Answer: B

Media access control:

Media access control: 



a. is not very important in point-to-point with full duplex configuration
b. is not very important in local area networks
c. is not very important in a point-to-point with a half duplex configuration
d. is not very important in a multipoint configuration
e. does not control when computers transmit



Answer: A

Which is not true about point-to-point circuits?

Which is not true about point-to-point circuits?



a. point-to-point circuits are dedicated to the use of the two computers.
b. point-to-point circuits are more expensive than multipoint circuits.
c. point-to-point circuits are called dedicated circuits.
d. point-to-point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits.
e. point-to-point circuits are used when the computers generate enough traffic to fill the capacity of the communication circuit.



Answer: D

_______ is the basic physical layout of the circuit.

_______ is the basic physical layout of the circuit.



a. point-to-point configuration
b. configuration
c. circuit configuration
d. circuit design
e. circuit plan



Answer: C

To get more "bandwidth" in a digital transmission, you must:

To get more "bandwidth" in a digital transmission, you must:




a. increase the range of frequencies available for a transmission
b. increase the loudness per transmission
c. decrease the bits per second transmission speed
d. increase the phase shifts per transmission
e. increase the baud rate per transmission



Answer: A

_______ is not a type of digital signaling technique.

_______ is not a type of digital signaling technique.



a. Non-return-to-zero signaling
b. Unipolar signaling
c. Manchester encoding
d. Return-to-zero signaling
e. Data rate signaling



Answer: E

Transmission speeds:

Transmission speeds:



a. are the same among all media
b. are not a factor in selecting a media because all media have more than enough speed to serve current communication demands
c. are a constant, 56Kbps, for all media types
d. differ widely among media
e. always have a direct correlation with security


Answer: D

Which of the following is not a key advantage of digital transmission?

Which of the following is not a key advantage of digital transmission?




a. It permits only low transmission rates.
b. It is more efficient.
c. It is simpler to integrate voice, video, and data on the same circuit.
d. It is more secure.
e. It produces fewer errors.


Answer: A

Which is not a function of the physical layer:

Which is not a function of the physical layer:




a. transmission of bits.
b. defining the rules by which one and zeroes are transmitted.
c. providing error-free transmission of data.
d. providing the physical connection between sender and receiver.
e. specifying the type of connection and type of signals, waves or pulses that pass though it.



Answer: C

IMAP (Internet Message Access Protocol):

IMAP (Internet Message Access Protocol):




a. is a set of standards that define how email is to be processed between mail servers
b. is exactly the same as SMTP
c. copies an e-mail message from the client computer's hard disk, deletes it from the client, and stores it on the mail server
d. is exactly the same as POP
e. permits an e-mail message to remain stored on the mail server even after they have been read by a client computer



Answer: E

The idea for a special hypertext network, called the World Wide Web, was conceived of by:

The idea for a special hypertext network, called the World Wide Web, was conceived of by:




a. Microsoft in 1994 as part of the Windows 95 project
b. Tim Berners-Lee at the European Laboratory for Particle Physics (CERN) in 1989
c. Vinton Cerf, for the U.S. Department of Defense in 1969 as a network of four computers called ARPANET
d. Howard Flieshman of IBM in 1982 as part of the development of the IBM PC
e. the University of Minnesota as an extension of Gopher



Answer: B

An N-tiered architecture:

An N-tiered architecture: 




a. is generally more "scalable" than a three-tiered architecture
b. is generally less "scalable" than a three-tiered architecture
c. uses only two sets of computers in which the clients are responsible for the application and presentation logic, and the servers are responsible for the data
d. uses exactly three sets of computers in which the client is responsible for presentation, one set of servers is responsible for data access logic and data storage, and application logic is spread across two or more different sets of servers
e. puts less load on a network than a two-tiered architecture because there tends to be less communication among the servers



Answer: A

Client-server architectures:

Client-server architectures: 




a. cannot connect computers that use different hardware
b. are one of the least used network architectures today
c. can use middleware to provide a standard way of communicating between software from more than one vendor
d. assign the responsibility for the presentation logic to the server
e. were the earliest type of network architectures



Answer: C

How are the application architecture functions split up in a client-server network?

How are the application architecture functions split up in a client-server network? 




a. the presentation logic and data storage are on the client, while the data access logic is on the server
b. the data storage, data access, and presentation logic are on the client
c. the presentation logic is on the client, while the data storage and data access logic are on the server
d. the data storage and data access logic are on the client, while the presentation logic are on the server
e. the presentation logic and data access logic are on the client, and the data storage is on the server



Answer: C

With the two-tier client-server architecture, the client is responsible for the ________ logic and the server is responsible for the ________ logic.

With the two-tier client-server architecture, the client is responsible for the ________ logic and the server is responsible for the ________ logic.




a. Application; presentation
b. Presentation; data access
c. Data access; presentation
d. Application; data access
e. Presentation; application storage



Answer: B

With a client-based network, one fundamental problem is that:

With a client-based network, one fundamental problem is that: 




a. the clients each must store all the data
b. the server does not have any data storage capability
c. the host or server must perform presentation logic, application logic, and data access logic at the same time
d. all data on the server must travel to the client for processing
e. the clients must perform the data storage logic



Answer: D

A "thick client" architecture approach:

A "thick client" architecture approach: 




a. always is a two-tier network architecture
b. always is an n-tiered architecture
c. places all or almost all of the application logic on the client
d. places all or almost all of the application logic on the server
e. refers to the size of the cable connecting the clients to the network



Answer: C

With respect to costs for a client-server network, which of the following is true?

With respect to costs for a client-server network, which of the following is true?



a. Personal computers used as clients in a client-server network cost about the same as mainframes for the same amount of computing power.
b. More network capacity, which costs more money, is required for client-server networks than for client-based networks.
c. Experts believe that client server architectures can be complex, but that developing application software for host based architectures is usually cheaper.
d. Updating the network with new version of software tends to be less expensive in a client-server network since the software is centralized in one client.
e. None of the above



Answer: C

One underlying problem with a host-based network is that:

One underlying problem with a host-based network is that: 




a. there are economies of scale because all computer resources are centralized
b. the server can get overloaded since it must process all messages
c. the architecture is relatively simple and works well
d. the server is the one point of control which simplifies security
e. clients (terminals) do not require sophisticated hardware/software because they do not perform most of the work in this type of architecture



Answer: B

Which of the following is not an important future trend in communication and networking?

Which of the following is not an important future trend in communication and networking? 



a. development of online batch systems
b. integration of voice, video, and data
c. pervasive networking
d. provision of new information services on rapidly expanding networks
e. development of extremely high speed broadband networks



Answer: A

Pervasive networking means that:

Pervasive networking means that: 




a. the five-layer network model will be used to design all networks
b. all networks of the future will be developed by a monopolistic organization
c. the cost of computers will be higher in the future
d. virtually all computers will be networked in some way to other computers and be able to transmit data at staggeringly fast rates
e. cable companies will offer more than 150 network selections for viewers



Answer: D

Which of the following is not an important future trend in communication and networking?

Which of the following is not an important future trend in communication and networking? 




a. development of online batch systems
b. integration of voice, video, and data
c. pervasive networking
d. provision of new information services on rapidly expanding networks
e. development of extremely high speed broadband networks



Answer: A

The three stages of the formal standardization process are _______.

The three stages of the formal standardization process are _______.




a. specification, identification of choices and acceptance.
b. planning, implementing and acceptance.
c. brainstorming, identification and implementing.
d. specification, formalization, and acceptance.
e. none of the above.



Answer: A

Which of the following is not true about de facto standards?

Which of the following is not true about de facto standards? 




a. They never evolve into formal standards.
b. They are those standards that emerge in the marketplace.
c. They tend not to be developed by an official industry or government body.
d. They are generally supported by more than one vendor but de facto standards have no official standing.
e. They tend to emerge based upon the needs/response of the marketplace.



Answer: A

The primary reason for networking standards is to:

The primary reason for networking standards is to:




a. simplify cost accounting for networks
b. ensure that hardware and software produced by different vendors can work together
c. make it more difficult to develop hardware and software that link different networks
d. ensure that all network components of a particular network can be provided by only one vendor
e. lock customers into buying network components from one vendor



Answer: B

Which of the following is not true about formal standards?

Which of the following is not true about formal standards?




a. They are always developed before de facto standards.
b. One example exists for network layer software (IP).
c. They can be developed by an official industry body.
d. They can take several years to develop.
e. They can be developed by a government body.



Answer: A

Which of the following is true with respect to the data link layer?

Which of the following is true with respect to the data link layer? 




a. It accepts streams of bits from the application layer.
b. It is responsible for getting a message from one computer to another (one node to another) without errors.
c. It does not perform error detection.
d. It performs routing functions.
e. It organizes data from the physical layer and passes these coherent messages to the application layer.



Answer: B
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