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單項選擇題

Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?（）

A. Cisco IOS IPsec/SSL VPN client
B. Cisco VPN Clinet
C. ISDN terminal adapter
D. Cisco Adaptive Security Appliance

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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

單項選擇題

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

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

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