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Showing posts with label TeleCom. Show all posts
Showing posts with label TeleCom. Show all posts

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
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