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單項選擇題

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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單項選擇題

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

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

單項選擇題

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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