单项选择题

Which spread spectrum technology does the 802.11b standard define for operation?（）

A. IR
B. DSSS
C. FHSS
D. DSSS and FHSS
E. IR, FHSS, and DSSS

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A cisco router is booting and has just completed the POST process.It is now ready to find and load an IOSimage.what function does the router perform next?（）

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C. It loads the first image file in flash memory
D. It inspects the configuration file in NVRAM for boot instructions

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Router A is unable to reach Router B.Both routers are running ios version 12.0.After reviewing the command output and graphic,what is the most likely cause of the problem?（）

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Which command enables IPv6 forwarding on a cisco router?（）

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D. ipv6 neighbor