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Huawei H12-821 Actual Exam Questions

Last updated on July 18, 2025.
97% Passed the exam with this material
334 Questions & Answers Included

Topic 1 - Exam A

Question #1 Topic 1

To prevent inter-area routing loops, OSPF does not allow advertising routing information between two non-backbone areas and allows advertising routing information only within an area or between the backbone area and a non-backbone area. Therefore, each ABR must be connected to the backbone area.

  • A. TRUE
  • B. FALSE
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Correct Answer: A 🗳️

Question #2 Topic 1

Which of the following statements regarding OSPF packets is false?

  • A. DD packets contain all LSA information and can be used to periodically synchronize LSOB information between neighbors.
  • B. Hello packets are used to discover and maintain OSPF neighbor relationships and also can be used to elect DR and BDR on broadcast and NBMA networks.
  • C. Two routers must send Hello packets at the same interval. Otherwise, they cannot establish an OSPF neighbor relationship.
  • D. DD packets carry LSA header information to describe link state summary information.
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Correct Answer: A 🗳️

Question #3 Topic 1

Which of the following statements regarding OSPF neighbor relationship and adjacency is true?

  • A. Not all neighbors can establish adjacencies.
  • B. Neighbor relationships are selected from adjacencies to exchange routing information.
  • C. OSPF routers must establish an adjacency before exchanging information.
  • D. Adjacencies are maintained using OSPF DD packet
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Correct Answer: A 🗳️

Question #4 Topic 1

Which of the following statements regarding different LSA types is false?

  • A. LS Update packets contain complete LSA information.
  • B. LS Ack packets contain complete LSA information.
  • C. LS Request packets contain only LS Type, LS ID, and Advertising Rooter.
  • D. DD packets contain only LSA summary information, including LS Type, LS ID, Advertising Router, and LS Sequence Number.
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Correct Answer: B 🗳️

Question #5 Topic 1

See the network shown in the following figure. Route leaking is configured on R1. In this case, R1 sends a Level-2 LSP to R3 so that R3 can learn routes on the entire network.

  • A. TRUE
  • B. FALSE
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Correct Answer: A 🗳️

Question #6 Topic 1

Which cost types are supported in IS-IS? (Choose all that apply.)

  • A. default
  • B. wide
  • C. ToS
  • D. Narrow
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Correct Answer: ABCD 🗳️

Question #7 Topic 1

Which of the following statements about IS-IS Hello packets are true? (Choose all that apply.)

  • A. Level-1 LAN IIH packets do not contain the System ID field.
  • B. P2P IIH packets and LAN IIH packets are exactly the same.
  • C. P2P IIH packets do not contain the Priority field.
  • D. Level-1 LAN IIH packets are sent in multicast mode.
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Correct Answer: CD 🗳️

Question #8 Topic 1

Two Level-1 routers in different areas can establish a neighbor relationship.

  • A. TRUE
  • B. FALSE
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Correct Answer: B 🗳️

Question #9 Topic 1

Which of the following attributes must be carried in an Update message?

  • A. local-Pref
  • B. MED
  • C. AS_Path
  • D. PrefVal
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Correct Answer: C 🗳️

Question #10 Topic 1

If a router receives two BGP routes carrying the following attributes, which of the following statements is true according to BGP route selection rules?

  • A. The optimal route is route N because its MED value is smaller than that of route M.
  • B. The optimal route is route N because its AS_Path is longer than that of route M.
  • C. The optimal route is route M because its AS_Path is shorter than that of route N.
  • D. The optimal route is route M because its MED value is larger than that of route N.
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Correct Answer: C 🗳️

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