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  3. The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area c

The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area c

admin2009-05-19  11
问题 The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.
Which of the following are layer 1 devices that you can use? (Choose all that apply.)
选项 A、A switch
B、A router
C、A network adapter card
D、A hub
E、A repeater
答案D,E
解析 Explanation:
A hub simply repeats the electrical signal and makes no attempt to interpret the electrical signal (layer 1) as a LAN frame (Layer 2). So, a hub actually performs OSI layer 1 functions, repeating an electrical signal, whereas a switch performs OSI layer 2 functions, actually interpreting Ethernet header information, particularly addresses, to make forwarding decisions. Hubs can be used to increase the number of stations that can be supported on a LAN.

Because the repeater does not interpret what the bits mean, but does examine and generate electrical signals, a repeater is considered to operate at Layer 1. Repeaters can be used to physically extend the LAN to greater distances.
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