Cisco Systems 2 manual Csma/Cd

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C.router(Config)# bandwidth 56000

D.router(Config-if)# clock rate 56000

Answer: B

Explanation: The bandwidth command overrides the default bandwidth. The bandwidth has no effect on the actual speed of the line. Instead, it is used to compute routing metrics ad the load of the link. Bandwidth is expressed in Kilobits. It is specified during interface configuration.

Incorrect Answers:

A is incorrect; the clock rate command is used to set the bandwidth on DCE cable not a Frame Relay connection that must not be abbreviated plus it must be used in the interface configuration mode.

C is incorrect; to change bandwidth of an interface you must be in the interface configuration mode and the rate must be expressed kilobits per second.

D is incorrect; the clock rate command is used to set the bandwidth on DCE cable not a Frame Relay connection.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 104-106.

Q. 66

What are the two primary operating modes for frame switching? (Choose two)

A.Full duplex

B.Half duplex

C.CSMA/CD

D.Cut through

E.Fragmentation

F.Store and forward

Answer: D, F

Explanation: There are 3 primary operating modes that are used for frame switching. These modes are sore- and-forward, cut-through and fragment free. When store-and-forward is used the switch must receive the whole frame before it can be forwarded. During a cut-through operation, the switch forwards the frame once it receives the Destination Address. Finally, the fragment-free mode reads the first 64 bytes before forwarding the frame.

Incorrect Answers:

A and B are incorrect; these are transmission modes of whether the transmission is done one way at at time (half Duplex) or simultaneous two-way (Full Duplex).

C is incorrect; this is a physical transmission medium, typically used in Ethernet LANs. E is incorrect; there is a fragment-free mode not a fragment mode.

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