H12-821_V1.0 Leak Questions

Comprehensive and Detailed Step-by-Step Explanation:

1. Understanding the IGMP Group Entry:

The IGMP group entry contains key information about multicast groups on the interface:

Group Address (225.1.1.2): The multicast group address that the user has joined.

Last Reporter (10.1.6.10): The IP address of the last host that sent an IGMP Report message for this group.

Uptime: The duration since the group was first reported.

Expires: The remaining time before the group entry ages out if no further reports are received.

2. Analysis of Each Statement:

Option A: This entry can be used to construct the corresponding (S, G) entry.

Incorrect.

This is a group entry for IGMP, which contains information about the group (G) but does not include a specific source (S). (S, G) entries are created in PIM (Protocol Independent Multicast), not IGMP.

Option B: This entry is created when the device receives an IGMP Join message from a user.

Correct.

IGMP Join messages are used by hosts to signal their intent to join a multicast group. When such a message is received, the group entry is created.

Option C: Expires indicates the aging time of the IGMP group.

Correct.

The "Expires" field shows the remaining time before the group entry ages out if no further IGMP reports are received.

Option D: 225.1.1.2 is the address of the group that the user joins.

Correct.

The "Group Address" field explicitly states that 225.1.1.2 is the multicast group that the user has joined.

3. Summary:

Correct Options: B, C, D

The filter-policy command in IS-IS is used to control the advertisement and filtering of routing information. However, it does not directly filter LSPs (Link State Packets); instead, it controls route advertisements. The false statement here is that it filters LSPs ​.

Comprehensive and Detailed Step-by-Step Explanation:

Analysis of VRRP Configuration:

Option A (Preemption): Correct. The output explicitly states that preemption is enabled.

Option C (Authentication): Correct. Authentication is enabled using MD5.

Option D (Group ID): Correct. The VRRP group ID is explicitly stated as 1.

False Statement:

Option B (mVRRP Group): The output does not indicate this is an mVRRP (Multicast VRRP) group. This feature must be explicitly configured and is not enabled by default.

References:

HCIA-Datacom Study Guide, Chapter: VRRP Configuration Details

Huawei VRRP Command Reference

Comprehensive and Detailed Step-by-Step Explanation:

Single-Hop BFD:

Single-hop BFD is used for detecting link failures in directly connected devices.

It uses UDP port 3784 for communication.

Multi-Hop BFD:

For multi-hop scenarios, BFD uses UDP port 4784 to ensure end-to-end connectivity.

Incorrect Options:

TCP ports 3784 and 4784 (C and D): BFD does not use TCP.

References:

HCIA-Datacom Study Guide, Chapter: BFD Ports and Functions

Huawei BFD Configuration Details