单项选择题

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

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