单项选择题

Which IPsec security protocol should be used when confidentiality is required?（）

A. AH
B. MD5
C. PSK
D. ESP

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A. ipv6 address PREFIX_1::1/64
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C. ipv6 autoconfig
D. ipv6 address 2001:db8:2222:7272::72/64

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单项选择题Why will a switch never learn a broadcast address?（）

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D. Broadcasts only use network layer addressing.
E. A broadcast frame is never forwarded by a switch.

Which parameter can be tuned to affect the selection of...

单项选择题Which parameter can be tuned to affect the selection of a static route as a backup.when a dynamic protocol is also being used?（）

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B. hop count
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E. link delay

CCNA(640-802)

Which IPsec security protocol should be used when confidentiality is required?（）