Archive for March 2018

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

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

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

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 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 multi point 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 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

________ 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

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
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