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Question No 1

Defense against the cache server The main method of DNS request flood is to use the DNS source authentication technology:

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Question No 2

A network is as follows: The l2tp vpn is established through the VPN Client and the USG (LNS). What are the reasons for the dialup failure?

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The tunnel name of the A LNS is inconsistent with the tunnel name of the client.

L2TP tunnel verification failed

0PPP authentication failed, the PPP authentication mode set on the client PC and LNS is inconsistent.

The client PC cannot obtain the IP address assigned to it from the LNS.

Question No 3

Which of the following statements is correct about the IKE main mode and the aggressive mode?

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All negotiation packets in the first phase of the aggressive mode are encrypted.

All the negotiation packets of the first phase in the main mode are encrypted.

barbarian mode uses DH algorithm

will enter the fast mode regardless of whether the negotiation is successful or not.

Question No 4

When the user's SSL VPN has been successfully authenticated, the user cannot access the Web-link resource. On the Web server, view the information as follows: netstat -anp tcp With the following information, which of the following statements is correct?

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intranet server does not open web service

virtual gateway policy configuration error

The connection between the virtual gateway and the intranet server is incorrect.

Virtual gateway and intranet server are unreachable

Question No 5

According to the dual-system hot backup network diagram, what are the correct descriptions in the following dual-system hot backup preemption function?

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VRRP backup group itself has a preemption function. As shown in the figure, after USG_A fails and recovers, USG_A will use the preemption function to change to the master state again.

The preemption function of the V VGMP management group is similar to that of the VRRP backup group. When the faulty backup group in the management group recovers, the management group priority will be restored.

By default, when the preemption delay is 0, the preemption is never preempted.

After the VRRP backup group is added to the VGMP management group, the original preemption function on the backup group will be invalid.

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