H12-821_V1.0 Exam Questions and Answers

QUESTION: 11

On an OSPF network, routers learn routing information on the entire network by exchanging LSAs.
Which of the following values is the LS Age in the LSA header when an LSA is deleted?

1800s
3600s
1200s
600s

Answer(s): B

Explanation:

LSA Lifetime and Deletion

The LS Age field in the LSA header tracks the age of an LSA. When the LS Age reaches its maximum value (3600 seconds), the LSA is marked for deletion. This ensures old or stale LSAs are removed from the network to maintain accurate routing information.

HCIP-Datacom-Core Reference

Detailed explanation of LS Age behavior and LSA deletion processes can be found in the OSPF LSDB

and LSA sections.

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QUESTION: 12

DRAG DROP (Drag and Drop is not supported)

OSPF networks are classified into four types of networks by link layer protocol. Drag the following link layer protocols to the corresponding network types.(Token is reusable)

See Explanation for Answer.

Answer(s): A

Explanation:

Network Types and Corresponding Link Layer Protocols

Broadcast: Ethernet

Point-to-Point (P2P): PPP, HDLC

Point-to-Multipoint (P2MP): PPP

Non-Broadcast Multi-Access (NBMA): Frame Relay

OSPF Network Types:
OSPF classifies networks based on link layer protocols into the following types:

Broadcast: This type assumes that all routers on the network can communicate directly with one another using multicast or broadcast frames. Ethernet networks are typical examples.

Point-to-Point (P2P): This type is used for links that connect two routers directly. Common protocols include PPP (Point-to-Point Protocol) and HDLC.

Point-to-Multipoint (P2MP): This type simulates multiple point-to-point connections over a single physical network, often used in WAN scenarios where PPP is employed.

Non-Broadcast Multi-Access (NBMA): These networks connect multiple devices but lack native broadcast capability, such as Frame Relay.

Reference:

HCIP-Datacom-Core Technology Training Material (OSPF Network Types).

Explanation of Matches:

Broadcast - Ethernet: Ethernet supports broadcast and multicast communication, making it a suitable example of a broadcast OSPF network.

P2P - PPP, HDLC: Both PPP and HDLC are designed for direct communication between two nodes, fitting the P2P category.

P2MP - PPP: In WANs, PPP often operates in a point-to-multipoint configuration, simulating separate connections for each endpoint.

NBMA - Frame Relay: Frame Relay is a classic NBMA technology where direct communication between devices requires manual configuration, as there is no inherent broadcast capability.

Conclusion:
This classification ensures that OSPF operates efficiently over different network types by adapting neighbor discovery and LSA propagation mechanisms to the underlying link layer technology.

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QUESTION: 13

On an IS-IS network, each router can generate LSPs.
Which of the following events trigger the generation of a new LSP?

Related IS-IS interfaces go up or down.
Periodic updates occur.
Inter-area IP routes change.
The IS-IS interface cost is increased.

Answer(s): A,B,D

Explanation:

LSP Generation in IS-IS
IS-IS routers generate new Link State Packets (LSPs) under the following conditions:

Interface Status Changes: When IS-IS interfaces go up or down, the link state changes, triggering LSP updates.

Periodic Updates: IS-IS periodically regenerates LSPs to ensure link-state information remains synchronized across the network.

Interface Metric Changes: Any modification to interface costs results in a new LSP to reflect the updated cost in the network.

Incorrect Option

C . Inter-area IP routes change is incorrect because IS-IS does not inherently differentiate between areas for LSP generation.

HCIP-Datacom-Core Reference

IS-IS LSP generation rules are detailed in the IS-IS configuration and implementation chapters.

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QUESTION: 14

Similar to the OSPF DR, the IS-IS DIS needs to be elected on a broadcast network. However, the OSPF DR is preemptive by default, whereas the IS-IS DIS is not preemptive by default.

TRUE
FALSE

Answer(s): A

Explanation:

DIS and DR Election

The IS-IS Designated Intermediate System (DIS) is responsible for generating and updating pseudonode LSPs on a broadcast network.

Unlike OSPF DR, the IS-IS DIS does not preempt by default. This behavior avoids unnecessary flapping in the network due to frequent DIS re-elections.

HCIP-Datacom-Core Reference

The characteristics of DIS and DR behavior are explained in IS-IS network operation chapters.

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QUESTION: 15

On an IS-IS network, routers send LSPs to exchange link state information. LSPs are classified into Level-1 LSPs and Level-2 LSPs and have the same format.
Which of the following parts constitute the LSP ID in an LSP?

LSP Number
Pseudonode ID
System ID
IS Type

Answer(s): A,B,C

Explanation:

IS-IS Overview: Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol. Routers exchange Link State Packets (LSPs) to maintain a synchronized link-state database. These LSPs are categorized into Level-1 LSPs (intra-area routing) and Level-2 LSPs (inter-area routing). Both types share the same packet format.

Reference:

HCIP-Datacom-Core Technology Training Material (IS-IS LSPs and Packet Structure).

LSP ID Format: The LSP ID uniquely identifies each LSP and ensures accurate routing information. It comprises the following components:

System ID (C): A 6-byte identifier assigned to each router, derived from the router's NET (Network Entity Title). This identifier ensures unique identification of routers within the IS-IS domain.

Pseudonode ID (B): Assigned when a router acts as a Designated Intermediate System (DIS) on a broadcast network. It differentiates LSPs generated by the DIS from other routers.

LSP Number (A): A 1-byte field indicating the sequence number of the LSP. It helps distinguish multiple LSPs generated by the same router for the same level.

HCIP-Datacom Advanced Routing & Switching Technology (IS-IS LSP Format).

IS Type Exclusion:

IS Type (D) is not part of the LSP ID itself. It is a field within the IS-IS PDU that indicates the type of Intermediate System (Level-1, Level-2, or both) but does not contribute to the composition of the LSP ID.

HCIE-Datacom V1.0 Training Material (IS-IS Basics and Levels).

Conclusion: The LSP ID in IS-IS consists of System ID, Pseudonode ID, and LSP Number. These components uniquely identify each LSP within the IS-IS domain.

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Huawei H12-821_V1.0 Exam (page: 3) Huawei HCIP-Datacom-Core Technology V1.0 Updated on: 12-Feb-2026

QUESTION: 11

Explanation:

QUESTION: 12

Explanation:

Reference:

QUESTION: 13

Explanation:

QUESTION: 14

Explanation:

QUESTION: 15

Explanation:

Reference:

Huawei H12-821_V1.0 Exam (page: 3)
Huawei HCIP-Datacom-Core Technology V1.0
Updated on: 12-Feb-2026