Huawei H12-821 Exam Practice Questions (P. 1)
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Question #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.
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Question #2
Which of the following statements regarding OSPF packets is false?
- ADD packets contain all LSA information and can be used to periodically synchronize LSOB information between neighbors.
- BHello 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.
- CTwo routers must send Hello packets at the same interval. Otherwise, they cannot establish an OSPF neighbor relationship.
- DDD packets carry LSA header information to describe link state summary information.
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Question #3
Which of the following statements regarding OSPF neighbor relationship and adjacency is true?
- ANot all neighbors can establish adjacencies.
- BNeighbor relationships are selected from adjacencies to exchange routing information.
- COSPF routers must establish an adjacency before exchanging information.
- DAdjacencies are maintained using OSPF DD packet
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Question #4
Which of the following statements regarding different LSA types is false?
- ALS Update packets contain complete LSA information.
- BLS Ack packets contain complete LSA information.
- CLS Request packets contain only LS Type, LS ID, and Advertising Rooter.
- DDD packets contain only LSA summary information, including LS Type, LS ID, Advertising Router, and LS Sequence Number.
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Question #5
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.

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Question #6
Which cost types are supported in IS-IS? (Choose all that apply.)
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Question #7
Which of the following statements about IS-IS Hello packets are true? (Choose all that apply.)
- ALevel-1 LAN IIH packets do not contain the System ID field.
- BP2P IIH packets and LAN IIH packets are exactly the same.
- CP2P IIH packets do not contain the Priority field.
- DLevel-1 LAN IIH packets are sent in multicast mode.
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Question #8
Two Level-1 routers in different areas can establish a neighbor relationship.
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Question #9
Which of the following attributes must be carried in an Update message?
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Question #10
If a router receives two BGP routes carrying the following attributes, which of the following statements is true according to BGP route selection rules?

- AThe optimal route is route N because its MED value is smaller than that of route M.
- BThe optimal route is route N because its AS_Path is longer than that of route M.
- CThe optimal route is route M because its AS_Path is shorter than that of route N.
- DThe optimal route is route M because its MED value is larger than that of route N.
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