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Huawei H12-821_V1.0 Exam (page: 6)
Huawei HCIP-Datacom-Core Technology V1.0
Updated on: 15-Feb-2026

Viewing Page 6 of 45
H12-821_V1.0 PDF 399 Questions

A BGP device receives a route carrying an unknown attribute from a peer but does not know whether other devices need the attribute. In this case, the BGP device retains this attribute when advertising the route to other peers.
Which of the following attributes is of this type?

  1. Community
  2. AS.Path
  3. MED
  4. OriginatorID

Answer(s): A

Explanation:

Transitive vs. Non-Transitive Attributes

The Community attribute is a transitive optional attribute, meaning that if a router receives a route with this attribute and does not understand its purpose, the router retains and propagates it to other peers.

Other options, such as AS_Path and MED, are well-defined mandatory or optional attributes with specific purposes.

HCIP-Datacom-Core Reference

The behavior of optional transitive attributes is detailed in the BGP protocol and attribute chapters.



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.

  1. TRUE
  2. FALSE

Answer(s): B

Explanation:

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.



ACLs are a common tool for matching routes. ACLs are classified into multiple types based on ACL

rule functions. An ACL can be identified by a number, and the number range for each type of ACLs is different.
Which of the following type of ACLs are numbered from 4000 to 4999?

  1. User-defined ACL
  2. Basic ACL
  3. Layer 2 ACL
  4. Advance ACL

Answer(s): A

Explanation:

ACL Number Ranges

Basic ACLs: Numbered from 2000 to 2999.

Advanced ACLs: Numbered from 3000 to 3999.

Layer 2 ACLs: Numbered from 5000 to 5999.

User-defined ACLs: Numbered from 4000 to 4999.

HCIP-Datacom-Core Reference

ACL classifications and their number ranges are covered in the ACL principles and configuration chapters.



ACLs are a common matching tool in routing policies. An ACL can be configured on a router to match routes.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

ACL in Routing Policies

ACLs are frequently used in routing policies to match specific routes based on criteria such as source

IP, destination IP, and more. This allows ACLs to influence route redistribution, filtering, and forwarding decisions.

HCIP-Datacom-Core Reference

ACL applications in routing policies are discussed in the routing policy chapters.



Both MQC and PBR can be applied on device interfaces to filter received and sent packets or control packet forwarding paths.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

MQC and PBR

MQC (Modular QoS Command-Line Interface): Applied to interfaces for classifying and controlling traffic.

PBR (Policy-Based Routing): Used to influence packet forwarding based on policies rather than traditional routing tables.

Both MQC and PBR can be configured on device interfaces to filter incoming/outgoing packets or control their forwarding paths.

HCIP-Datacom-Core Reference

The use of MQC and PBR on device interfaces is elaborated in the QoS and routing control chapters.



Viewing Page 6 of 45



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