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Internet Group Management Protocol (IGMP)

5 minutes 5 Questions

Internet Group Management Protocol (IGMP) is a network-layer protocol used by IP hosts and adjacent routers to establish multicast group memberships. IGMP allows hosts to request multicast traffic from a router for specific multicast group addresses, enabling efficient distribution of network traff…

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CompTIA Network+ - Internet Group Management Protocol (IGMP) Example Questions

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Question 1

Which of the following protocols allows hosts to discover multicast group membership information and advertise their membership to other network devices?

Correct Answer: IGMP

IGMP, which stands for Internet Group Management Protocol, is the correct answer. IGMP is explicitly designed to let network devices and hosts communicate about multicast group membership - for instance, who wants to receive data from a particular multicast IP address. IGMP allows routers to learn which hosts belong to which multicast groups. On the other hand, MPLS (Multiprotocol Label Switching) is a protocol for speedy network traffic flow and STP (Spanning Tree Protocol) is a protocol for preventing bridge loops and the broadcast radiation that results from them. ARP, the Address Resolution Protocol, is used to convert an IP address into a physical (or MAC) address on a local network. Therefore, these other protocols are irrelevant to the discovery and advertisement of multicast group membership.

Question 2

Which of the following IGMP-related components plays a role in querying hosts for their multicast group membership information?

Correct Answer: IGMP querier

The IGMP querier is the component that plays a role in querying hosts for their multicast group membership information. The function of an IGMP querier is to send out IGMP queries to discover which hosts belong to which multicast groups. The hosts then respond with IGMP reports that indicate their group membership. On the other hand, IGMP snooping is not involved in querying hosts but rather observes the IGMP communication between hosts and routers to learn which hosts belong to which multicast groups. IGMP proxy acts as a go-between for IGMP hosts and routers but does not query the hosts itself. IGMP fast-leave is a process for enabling a router to quickly stop sending multicast traffic to a host when it leaves a multicast group, but it does not involve querying host for their multicast group membership information.

Question 3

A company's video conferencing application is causing high bandwidth usage which impacts other services. Which of the following IGMP versions should the network administrator implement to help manage this type of traffic?

Correct Answer: IGMPv3

IGMPv3 should be implemented by the network administrator to manage high bandwidth usage caused by the company's video conferencing application. IGMPv3 (Internet Group Management Protocol, version 3) supports source-specific multicast (SSM), which allows traffic from specific multicast groups to be forwarded only to specific hosts, avoiding the flood of the entire network, which can help to manage and limit bandwidth usage. IGMPv1 and IGMPv2, while they are also versions of the same protocol, do not support SSM and therefore are less effective in managing this type of traffic. IGMP proxy is not a version of IGMP; it is a feature that allows a device to act as a proxy for IGMP messages between two networks, which is not what is needed in this situation.

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