SSL works at the application layer and encrypts specific applications. Which layer does IPSec work on and provides transparent encryption protection for this layer and above?

• A.data link layer
• B.representation layer
• C.network layer
• D.transport layer

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The preemption function of the VGMP management group is enabled by default, and the delay time is 60s.

• A.TRUE
• B.FALSE

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A user dials to the LNS of the company through L2TP over IPSec using the VPN client, and the final dialup fails. However, the debug ike all and debug l2tp all did not see any information on the LNS. The two stages of establishing ike failed. What are the reasons for the failure?

• A.IPSec data stream does not reach the firewall
• B.The firewall (LNS) is connected to the public network. The IPSec policy is not applied to the interface.
• C.L2TP is not enabled on D LNS
• D.Interest traffic ACL configuration error

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What are the correct statements about the following VRRP and VGMP protocol messages?

• A.VGMP packet communication between the V VGMP management group and the VRRP backup group
• B.VGMP Hello packet communication between the A VGMP management group and the VRRP backup group
• C.VGMP management group communicates through VRRP packets
• D.VGMP management group communicates through VGMP Hello messages.

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If the firewall works at Layer 2 and is directly connected to the intranet or connected through a Layer 2 switch, which of the following cannot be used as a matching condition for the policy route?

• A.DSCP priority
• B.Inbound interface
• C.MAC address
• D.IP address

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