H12-821_V1-0 practice question 29 of 30

Based on IGMP snooping, IGMP snooping proxy enables a switch to act as a substitute for an upstream Layer 3 device to send IGMP Query messages to…

Choose your answer, then check it against the explanation.

Domain Network Features, Services, and O&M

Based on IGMP snooping, IGMP snooping proxy enables a switch to act as a substitute for an upstream Layer 3 device to send IGMP Query messages to downstream hosts, and also to act as a substitute for downstream hosts to send IGMP Report/Leave messages to an upstream device. As such, this function conserves bandwidth between the upstream device and the local device.

Answer options

Correct Answer:

[TRUE]

Explanation

The statement accurately describes the functionality and primary benefit of IGMP snooping proxy. A Layer 2 switch configured with IGMP snooping proxy intercepts IGMP messages. It acts as a proxy for the upstream multicast router (querier) by sending its own IGMP Query messages to downstream hosts. Concurrently, it acts as a proxy for the downstream hosts by terminating their IGMP Report and Leave messages, processing them, and then generating and sending its own consolidated Report/Leave messages upstream. This consolidation significantly reduces the number of IGMP control packets sent to the upstream router, thereby conserving bandwidth on the link between the switch and the router.

Why Incorrect

This is a "TRUE OR FALSE" question. The provided statement is factually correct and accurately describes the mechanism and purpose of IGMP snooping proxy according to official documentation.

References

1. Huawei CloudEngine S5735-L Series Switches Documentation: In the section on IGMP Snooping Proxy

the documentation states

"After an IGMP snooping proxy is configured on a Layer 2 device

the Layer 2 device can terminate IGMP Report/Leave messages from user hosts and send new IGMP Report/Leave messages to the upstream Layer 3 device. In this way

the number of IGMP messages sent to the upstream device is reduced." It further clarifies

"The IGMP snooping proxy function allows a Layer 2 device to act as a proxy for the upstream querier to send Query messages to user hosts."

Source: Huawei Enterprise Support

"CloudEngine S5735-L Series Switches Product Documentation > Configuration > Multicast Configuration Guide > Configuring IGMP Snooping > Configuring an IGMP Snooping Proxy".

2. HCIP-Datacom-Core Technology V1.0 Training Material: The official training material for the H12-821 exam explains that the IGMP snooping proxy feature enables a Layer 2 device to maintain its own multicast forwarding entries by interacting with hosts directly. It then synthesizes membership information and reports it to the upstream router. This process explicitly involves the switch acting as a querier for the local segment and a representative for hosts towards the upstream router

with the stated goal of reducing IGMP protocol traffic.

Source: Huawei

"HCIP-Datacom-Core Technology V1.0 Training Material"

Chapter: "Multicast Protocols"

Section: "IGMP Snooping".

3. Huawei HedEx Documentation for VRP (Versatile Routing Platform): The comprehensive technical manuals for Huawei's VRP operating system

which powers its networking devices

describe IGMP snooping proxy in detail. The documentation confirms that the proxy function is designed to reduce the processing load on the upstream router and minimize IGMP traffic across the network by having the Layer 2 switch manage local group memberships and queries.

Source: Huawei HedEx Documentation

"VRP V800R010C00 Configuration Guide - Multicast"

Section: "Configuring IGMP Snooping".

Question 29 of 30

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