单项选择题

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?（）

A. after broken links are re-established
B. in an improperly implemented redundant topology
C. when upper-layer protocols require high reliability
D. during high traffic periods
E. when a dual ring topology is in use

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单项选择题

Which command sets and automatically encrypts the privileged enable mode password?（）

A. enbale password c1sco
B. secret enable c1sco
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Which statement is true?（）

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B. An IPv6 address is 32 b long and is represented as decimal digits.
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B. The TFTP server is unreachable from the router.
C. The new IOS image is not correct for this router platform.
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