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C.A network number and host number.

D.A broadcast number and unicast number.

E.A domain identifier and a device identifier.

Answer: C

Explanation: The network layer address exists at Layer 3 of the OSI reference model. These address are hierarchical in that they define networks first and then devices or nodes on each of the networks.

Incorrect Answers:

A is incorrect; a URL is used in the application layer, (HTTP).

B is incorrect; this is describing a MAC address which is Layer 2.

D is incorrect; this is not an addressing mode.

E is incorrect; this is used in the application layer, Domain for DNS.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 20-29.

Q. 216

Which type of LAN segmentation device enables high-speed data exchange?

A.Hub

B.Bridge

C.Switch

D.Repeater

Answer: C

Explanation:

A switch can be used to gain high-speed data transfer between segments, especially when cut through is used. The internals of the switch are specifically designed for high-speed transfer, even with high volumes.

Incorrect Answers:

A is incorrect; a hub causes the segment to be shared, and collisions slow down the segment. A hub does not cause segmentation.

B is incorrect; a bridge usually separates a small amount of segments and with large amounts of data transfer across the bridge, the bridge can become a bottleneck.

D is incorrect; a repeater extends the distance of the segment by amplifying electrical signals, but does not segment the LAN.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 32-38.

Q. 217

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