Huawei Huawei Certification H12-222 Questions & Answers

• Question 21:

  Which of the following statements regarding the VRRP master is false?

  A. The VRRP master periodically sends VRRP packets.

  B. The VRRP master uses the virtual MAC address to respond to ARP Request packets destined for the virtual IP address.

  C. The VRRP master forwards IP packets destined for the virtual MAC address.

  D. Even if the router becomes the master, the backup router with a higher priority preempts to be the master.

  Correct Answer: D

• Question 22:

  Which command is used to enable association between BFD and OSPF on all interfaces?

  A. bfd enable

  B. bfd all-interface enable

  C. all-interface bfd enable

  D. undo bfd all-interface disable

  Correct Answer: B

• Question 23:

  On a MPLS network, switches can distribute labels. Which of the following statements regarding label distribution control mode is true?

  A. The downstream LSR determines a label bound to a specific FEC, and then notifies the upstream LSR.

  B. In Downstream on Demand (DoD) mode, an LSR distributes a label to an FEC without having to receive the label request message from its upstream LSR.

  C. In Downstream Unsolicited (DU) mode, an LSR distributes a label to an FEC after receiving a label request message from its upstream LSR.

  D. The upstream LSR and downstream LSR with label advertisement adjacencies may use different label distribution control modes.

  Correct Answer: A

• Question 24:

  Which of the following statements regarding buffer overflow attacks is false?

  A. The buffer overflow attack indicates that an attacker uses defects of memory operations of the software system and runs attack codes with high operation rights.

  B. The buffer overflow attack is irrelevant to the OS vulnerabilities and architecture.

  C. The buffer overflow attack is the most common attack of the software system.

  D. The buffer overflow attack is an application-layer attack.

  Correct Answer: B

• Question 25:

  Intranet users of a company use NAT in no-pat mode to access the Internet. If all public IP addresses are used, what will happen when subsequent intranet users go online?

  A. The previous user is disconnected forcibly and subsequent intranet users go online through NAT translation.

  B. Subsequent intranet users cannot go online.

  C. NAT is automatically switched to PAT, and then subsequent intranet users go online.

  D. Packets are synchronized to another NAT translation device.

  Correct Answer: B

• Question 26:

  The jitter occurs because the E2E delays of data packets in the same flow are different.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 27:

  The WRED drop profile defines the following parameters for AF21 traffic: the lower drop threshold is 35, the upper drop threshold is 40, and the maximum drop probability is 50%. Which of the following statements regarding the processing result of AF21 traffic are false? (Multiple Choice)

  A. When the average length of packets in the queue is smaller than 35, packets are discarded.

  B. When the average length of packets in the queue is larger than 35 and smaller than 40, the drop probability of packet is 50%.

  C. When the average length of packets in the queue is larger than 40, packets enter the queue.

  D. When the average length of packets in the queue is larger than 40, packets are discarded.

  Correct Answer: AC

• Question 28:

  To avoid global TCP synchronization, which congestion avoidance mechanisms can be used? (Multiple Choice)

  A. RED

  B. WRED

  C. Tail drop

  D. WFQ

  Correct Answer: AB

• Question 29:

  Simple traffic classification uses the DSCP priority of IP packets, the EXP priority of MPLS packets, and 802.1p priority of VLAN packets.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 30:

  How many bits does an MPLS label field have?

  A. 8

  B. 3

  C. 1

  D. 20

  Correct Answer: D