单项选择题

At which layer of the OSI model is RSTP used to prevent loops?（）

A. data link
B. network
C. physical
D. transport

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单项选择题
Which IPsec security protocol should be used when confidentiality is required?（）

A. PSK
B. AH
C. MD5
D. ESP
单项选择题
which command allows you to verify the encapsulation type CISCO OR IETF for a frame relay link?（）

A. show frame-relay map
B. show frame-relay lmi
C. show inter serial
D. show frame-relay pvc
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