What is the aging time of the router port defined in IGMP Snooping?

Question

Options

• A150
• B90
• C180
• D120

• A
  4% (1)
• B
  4% (1)
• C
  77% (20)
• D
  15% (4)

Explanation

In IGMP Snooping, the router port aging time is standardized at 180 seconds, making option C correct. This value represents how long a switch maintains an entry for a router port before it expires if no IGMP General Query messages are received from that port. Options A (150), B (90), and D (120) are plausible-looking values but do not match the defined standard timer - they may be confused with other IGMP or multicast-related timers, such as query intervals or group membership timeouts. For exam purposes, remember that 180 seconds is three minutes, and you can associate "router port aging" with "3 minutes" - the same duration as many other common network aging defaults, which makes it a logical and memorable figure.

No community discussion yet for this question.