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This chapter is from the book

This chapter is from the book

Answers to Review Questions

1. A is correct. 802.3an is 10 Gigabit Ethernet (10GBASE-T). This high-speed Ethernet technology uses copper cables (Cat 6 or Cat 6a) as the physical medium.

2. D is correct. Unlike devices (for example, a switch and a PC) are connected with straight-through cables. If you connect like devices (for example, a switch and a switch), you use a crossover cable.

3. B is correct. Modern networks consist of full-duplex links that use a point-to-point Ethernet environment. This eliminates collisions on the LAN.

4. C is correct. The first PoE standard adopted, in 2003, is the 802.3af standard. 802.3af has been integrated into 802.3-2012.

5. B is correct. The show controllers command allows you to see what type of serial cable attaches to the interface.

6. B is correct. A crossover cable is used to connect like devices, such as two switches.

7. D is correct. Many technologies today require that additional information be added to Ethernet frames. This results in frame sizes up to around 9000 bytes. Technically, any frame over 1500 bytes of payload is called a Jumbo frame. These frames are sometimes reported by networking devices as Giants.

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