Huawei H12-821_V1.0 Exam Questions Instant Access

Question 1

Which of the following statements regarding the OSPF protocol is false?

AEach OSPF router uses only one Router-LSA to describe the local active connection status of an area.

BRouting information can be advertised only between backbone and non-backbone areas and cannot be advertised directly between non-backbone areas.

CRouter-LSA describes four connection types: P2P, TransNet, SubNet, and virtual link.

DLink State ID in a Type 3 LSA indicates the router ID of an ABR.

Answer : D

The Link State ID in a Type 3 LSA (Summary LSA) indicates the network or subnet being summarized, not the router ID of an ABR. All other statements accurately describe OSPF functionality, making D the false statement .

Question 2

On an IS-IS network, two directly connected routers establish a neighbor relationship through the three-way handshake mechanism by default, regardless of whether the network type is P2P or broadcast.

ATRUE

BFALSE

Answer : A

Comprehensive and Detailed Step-by-Step

IS-IS Three-Way Handshake:

IS-IS uses a three-way handshake to establish neighbor relationships.

This process is applied on both point-to-point (P2P) and broadcast network types to confirm bidirectional communication.

P2P Networks:

Routers directly exchange IS-IS Hello (IIH) packets to establish adjacency.

Broadcast Networks:

IS-IS also uses the three-way handshake on broadcast networks to ensure that the Designated Intermediate System (DIS) election and adjacency formation are correct.

HCIA-Datacom Study Guide, Chapter: IS-IS Adjacency Establishment

Huawei IS-IS Network Configuration

Question 3

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.

ATRUE

BFALSE

Answer : A

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.

Question 4

After a BGP peer relationship is established between two ends, changing the router ID of one end resets the BGP peer relationship.

ATRUE

BFALSE

Answer : A

Comprehensive and Detailed Step-by-Step

BGP Router ID Behavior:

The router ID uniquely identifies a BGP device in the network.

If the router ID is changed, it is equivalent to creating a new BGP instance, and the existing BGP session is reset to establish a new peer relationship.

Impact of Router ID Change:

BGP peering relies on stable identifiers. Changing the router ID disrupts the TCP session and requires reestablishing the relationship.

HCIA-Datacom Study Guide, Chapter: BGP Peer Relationships

Huawei BGP Configuration Best Practices

Question 5

On an RSTP network, if a port receives an RST BPDU and finds that its buffered RST BPDU is superior to the received RST BPDU, the port discards the received RST BPDU without responding.

ATRUE

BFALSE

Answer : A

RST BPDU Handling

On an RSTP network, if a port receives an RST BPDU and determines its own buffered BPDU is superior, it discards the received BPDU without responding. This ensures stability and proper convergence in the network.

HCIP-Datacom-Core Reference

BPDU handling is described in the RSTP operation chapters.

Question 6

When configuring an ACL on a router, you can specify a unique number or name to identify the ACL. Once a named ACL is created, it cannot be modified. You can only delete the named ACL and reconfigure it.

ATRUE

BFALSE

Answer : B

ACL Modification

Named ACLs can be modified after their creation. Unlike numbered ACLs, named ACLs provide greater flexibility for editing individual rules without deleting the entire ACL.

Therefore, the statement is incorrect.

HCIP-Datacom-Core Reference

The flexibility and editability of named ACLs are discussed in the ACL configuration sections.

Question 7

Which of the following statements regarding OSPF route summarization commands are true?

AThe asbr-summary command is executed in the OSPF view.

BThe abr-summary command is executed in the OSPF area view.

CAdvertise is the default parameter of the abr-summary command. That is, if not-advertise is not specified in the abr-summary command, the advertise parameter takes effect by default.

DNot-advertise is the default parameter of the abr-summary command. That is, if advertise is not specified in the abr-summary command, the not-advertise parameter takes effect by default.

Answer : A, B, C

The asbr-summary command is executed in the global OSPF view to summarize external routes. The abr-summary command is executed in the OSPF area view to summarize routes between areas. By default, the advertise parameter is enabled unless explicitly overridden by the not-advertise option .

Huawei HCIP-Datacom-Core Technology V1.0 H12-821_V1.0 Exam Questions