单项选择题
A. Cisco IOS IPsec/SSL VPN client B. Cisco VPN Clinet C. ISDN terminal adapter D. Cisco Adaptive Security Appliance
At which layer of the OSI model is RSTP used to prevent...
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
Which IPsec security protocol should be used when confi...
单项选择题Which IPsec security protocol should be used when confidentiality is required?（）
A. PSK B. AH C. MD5 D. ESP
which command allows you to verify the encapsulation ty...
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
