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

Comprehensive and Detailed Step-by-Step Explanation:

1. Understanding IGMP (Internet Group Management Protocol):

IGMP is used in multicast networking to manage membership of devices in multicast groups.

Key parameters in the configuration provided:

Interface IP Address:192.168.1.1

IGMP Version:2

Query Interval (Configured):60 seconds

Maximum Query Response Time:10 seconds

Querier Address:192.168.1.1

2. Analysis of Each Statement:

Option A: The IP address of the interface is 192.168.1.1.

Correct (True Statement).

The configuration clearly shows that the IP address of the interface is 192.168.1.1.

Option B: The maximum response time to Query messages is 10s.

Correct (True Statement).

The configuration explicitly mentions: Value of maximum query response time for IGMP: 10 s.

Option C: The interval for sending Group-Specific Query messages is 60s.

Incorrect (False Statement).

The 60-second value refers to thequery interval, which is the time interval betweengeneral queriessent by the querier.

The interval forgroup-specific queriesis not specified in this configuration. It is determined dynamically based on the multicast environment and is usually shorter than the general query interval.

Option D: The IGMP version is IGMPv2.

Correct (True Statement).

The configuration specifies: Current IGMP version is 2.

3. Why Option C is False:

The 60-second value is forgeneral query interval, not group-specific query interval.

The statement misinterprets the configuration, making itfalse.

4. Summary:

Correct Answer:C (The interval for sending Group-Specific Query messages is 60s).

Comprehensive and Detailed In-Depth Explanation:

Intermediate System to Intermediate System (IS-IS)routers sendIS-to-IS Hello (IIH) packetsto establish neighbor relationships.

TheReserved/Circuit Type fieldin IIH packets indicateswhich level of IS-IS adjacencythe router is trying to establish:

00→ Level-0 (Not used in IS-IS).

01→ Level-1 router.

10→ Level-2 router.

11→Level-1-2 router (Both levels supported).

Since the question asks for the field value in anL1-L2 router’s IIH packets, the correct answer is11 (B).

????Reference:Huawei HCIA-Datacom Study Guide, IS-IS Neighbor Discovery and IIH Packet Format.

In RSTP, a port in thediscardingstate neither forwards data frames nor learns MAC addresses. A port in thelearningstate does not forward data frames but starts learning MAC addresses. Therefore, options A and B are correct, while C and D are incorrect due to misunderstandings of these states ​.

IS-IS uses a two-level hierarchy:

Level-1 routersoperate within a single area and cannot exchange routing information with routers in other areas directly.

To reach external areas (the IS-IS backbone or other areas), Level-1 routers rely onLevel-1-2 routers, which perform inter-area route redistribution.

Therefore, a Level-1 routermust use a Level-1-2 routeras a gateway to reach destinations outside its own area.