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Huawei Certification
H12-821_V1.0 Exam
Huawei.H12-821_V1.0.v2026-02-20.q316 Dumps

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Question 111

On an IS-IS network, all routers generate LSPs. Which of the following types of information is not contained in the LSPs generated by pseudonodes?

A.Interface information
B.Information about supported network protocols
C.Route information
D.Neighbor information

Correct Answer: C

A pseudonode in IS-IS is a logical representation of a broadcast network segment (e.g., Ethernet) where the Designated Intermediate System (DIS) generates an LSP on behalf of the LAN.
Pseudonode LSPs contain:
* Interface information (i.e., the interface that connects to the pseudonode)
* Neighbor information (adjacencies with other routers on the LAN)
* Protocol information (e.g., supported address families)
However, route information is not contained in LSPs generated by pseudonodes because routing information is advertised in the LSPs generated by the routers themselves, not the pseudonode.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"Pseudonode LSPs contain information about the broadcast link, including interface and neighbor data. They do not advertise routing entries." (Chapter: IS-IS Advanced Features - Section: DIS and Pseudonodes)

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Question 112

When creating a single-hop BFD session for the first time, bind the single-hop BFD session to the peer IP address and the local address. To modify a configured BFD session, delete it and create a new one.

A.TRUE
B.FALSE

Correct Answer: A

Comprehensive and Detailed Step-by-Step Explanation:
1. Single-Hop BFD Session:
* A single-hop BFD session is used to detect link failures between directly connected devices.
* It is bound to the local IP address and the peer IP address, and the session relies on these parameters to establish connectivity.
2. Why Modifications Require Deletion:
* BFD sessions are tightly bound to their configuration parameters (e.g., local and peer IP addresses).
* Modifying these parameters is not supported for an existing session. Instead, you must delete the session and recreate it with the updated parameters.
3. Why the Statement is TRUE:
* The statement correctly describes the behavior of BFD sessions, where modifying an existing session is not possible without deleting it first.

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Question 113

An OSPF AS-external LSA describes a route to an AS external network. When the field in the LSA is 0.0.0.0, the traffic destined for the external network is sent to the ASBR that imports this external route. (Enter the acronym in uppercase.)

Correct Answer:

NSSA
Explanation:
An OSPF AS-external LSA is used to describe routes to networks that are external to the OSPF Autonomous System (AS). This external route information is typically imported into OSPF by an Autonomous System Boundary Router (ASBR).
If the Forwarding Address field in the AS-external LSA is set to 0.0.0.0, this indicates that traffic destined for the external network should be forwarded directly to the ASBR that advertised the external route.
The specific context mentioned here relates to the Not-So-Stubby Area (NSSA), a type of OSPF area designed to handle AS-external routes in a more controlled way. In NSSAs:
* Type 7 LSAs are used to describe AS-external routes.
* The ASBR within the NSSA converts the Type 7 LSA to a Type 5 LSA before advertising it to the backbone area.
Hence, the correct acronym for the described functionality is NSSA.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF Area Types".
* RFC 3101 - OSPF Not-So-Stubby Area (NSSA) Option.

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Question 114

When two devices with the same priority compete for the Master role at the same time, the device with the interface with the smaller IP address should be selected as the Master device.

A.TRUE
B.FALSE

Correct Answer: B

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Question 115

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

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

Correct Answer: A

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