H12-721 Free Exam Questions & Answers (Updated 2026)

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

The figure shows the data flow direction of the Bypass interface in the Bypass working mode and the non - Bypass working mode. What are the following statements about the working flow of the electrical Bypass interface?

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When the interface is in the non - bypass state, the traffic flows from the GE0 interface to the USG through Router_a. After the USG processes, the traffic flows from the GE1 interface to Router_B.

When the interface is working in the Bypass state, the traffic is forwarded from the GE0 interface to the USG. The USG does not pass any processing and flows directly from the GE1 interface to Router_B.

When the firewall is configured to implement the security priority, the uplink and downlink services are not interrupted when the interface works in the bypass state. Therefore, the device can be kept in the Bypass state.

The electrical bypass interface can only work in Layer 2 mode and has circuit bypass function.

Question No 3

What are the drainage schemes that can be used in the scenario of bypass deployment in Huawei's abnormal traffic cleaning solution?

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Question No 4

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 5

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.

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