1．Which statement about half-duplex Ethernet operations is ture?

　　A. With half-duplex transmission frames feed into a single cable in

　　one direction at a time.

　　B. half-duplex transmissino between stations is achieved by suing

　　point-to-point Ethernet and fast Ethernet connections.

　　C. Half-duplex transmission between stations is achieved by using

　　point-to-multipoint Ethernet and Fast Ethernet connections.

　　D. Half-duplex Ethernet technology provides a transmit circuit

　　connection wired directly to receiver circuit at the other end of

　　the connection.

　　Answer：A

　　B. point－to－point用于full－duplex，fast

　　Ethernet支持half－duplex也支持full－duplex。

　　C．怀疑错在point－to－multipoint上，书上我没有找到。

　　D．full－duplex的功能而不是half－duplex

　　2. which command should you use to configure a router so that it can

　　become a TFTP server host for a router system image that is run in

　　flash?

　　a. copy flash tftp

　　b. config tftp server

　　c. write network

　　d. tftp-server system

　　e. setup server tftp

　　Answer：D

　　命令出自Sybex P368

　　3．62.What are four functions/characteristics of the network layer of

　　the osi model?(choose four.)

　　*a. it uses a two-part address.

　　b.it maintains routing tables.

　　c. it uses broadcast addresses.

　　d.it establishes network addresses.

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