A switch runs MSTP. The configuration is shown in the figure. Which of the following statements is false, based on the following IGMP information on an interface of RTA? What is the role of this…

Question

Options

• AThe interval for sending group-specific Query messages is 60s.
• BThe maximum time for response to Query messages is Qs.
• CThe Router IP address of RTA is 192.168.1.1.
• DThe IGMP version is IGMPv2.

• A
  73% (22)
• B
  7% (2)
• C
  17% (5)
• D
  3% (1)

Explanation

Option A is false because the interval for sending group-specific Query messages is not 60 seconds. Group-specific queries are sent when a router receives a Leave message and needs to quickly confirm whether any remaining hosts still want the multicast group; the standard default interval for these is 1 second (the Last Member Query Interval), making 60 seconds an incorrect value for this parameter. Options B, C, and D are all true statements directly readable from the IGMP interface output shown in the figure: the maximum response time for Query messages, the router IP address of 192.168.1.1, and the use of IGMPv2 are each accurately reflected in the display. The common trap here is confusing the general Query Interval (which can be 60 or 125 seconds depending on implementation) with the group-specific Query Interval, which is far shorter by design so the router can rapidly detect member loss and stop forwarding unneeded multicast traffic.

Memory tip: Associate "group-specific" queries with urgency and speed - they exist to react quickly to hosts leaving, so their interval is measured in seconds, not minutes. If an answer claims 60 seconds for group-specific queries, that is the red flag.

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