Huawei Updated H12-821_V1.0 Exam Questions and Answers by ana

Comprehensive and Detailed Step-by-Step Explanation:

1. Understanding Hybrid Interfaces on a Layer 2 Switch:

Layer 2 switches support different interface types, such as access , trunk , and hybrid interfaces.

A trunk interface allows traffic from multiple VLANs to pass through, but frames belonging to the native VLAN are sent untagged, while all other VLAN frames are tagged.

A hybrid interface is more flexible:

It allows traffic from multiple VLANs to pass through, just like a trunk interface.

However, you can configure whether frames for specific VLANs are tagged or untagged as they leave the interface. This feature is useful in certain networking scenarios, such as connecting devices that do not support VLAN tagging.

2. Key Differences Between Trunk and Hybrid Interfaces:

3. Why the Statement is TRUE:

The statement accurately describes the functionality of a hybrid interface:

It supports traffic from multiple VLANs.

It allows administrators to configure whether outgoing frames are tagged or untagged for specific VLANs.

4. Summary:

The statement is TRUE because hybrid interfaces on a Layer 2 switch support traffic from multiple VLANs and allow flexible tagging configurations.

Comprehensive and Detailed In-Depth Explanation:

When a packet is checked against an Access Control List (ACL) , it is processed based on rule matches.

" Unmatched " scenarios occur if:

A. TRUE → The packet does not match any ACL rule .

C. TRUE → No ACL is configured , so there are no rules to match.

D. TRUE → An empty ACL exists , meaning no rules are defined.

B is incorrect because if the packet matches a deny rule, it is " matched " and explicitly dropped , not " unmatched " .

???? Reference: Huawei HCIA-Datacom Study Guide, ACL Rule Matching and Processing Logic.

The Local-Preference attribute is used within an AS to influence outbound traffic paths. The default value is 100, and it is a well-known discretionary attribute, meaning it is not mandatory and does not travel across AS boundaries ​.

Master

Backup

Master

Backup