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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