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400-007 · Question #90

Which two statements about MLD snooping are true? (Choose two)

The correct answer is C. AN MLD snooping querier election occurs when any MLD snooping querier goes down or if there D. When multiple MLD snooping queriers are enabled in a VLAN, the querier with the lowest IP. MLD snooping querier elections are triggered when a querier goes down or a change occurs, and the querier with the lowest IP address wins when multiple queriers are present in a VLAN.

Designing Network Infrastructure

Question

Which two statements about MLD snooping are true? (Choose two)

Options

  • AWhen MLD snooping is enabled, QoS is automatically enabled.
  • BA VLAN can support multiple active MLD snooping queries, as long as each one is associated to
  • CAN MLD snooping querier election occurs when any MLD snooping querier goes down or if there
  • DWhen multiple MLD snooping queriers are enabled in a VLAN, the querier with the lowest IP

How the community answered

(49 responses)
  • A
    4% (2)
  • B
    2% (1)
  • C
    94% (46)

Why each option

MLD snooping querier elections are triggered when a querier goes down or a change occurs, and the querier with the lowest IP address wins when multiple queriers are present in a VLAN.

AWhen MLD snooping is enabled, QoS is automatically enabled.

MLD snooping and QoS are independent features; enabling MLD snooping does not automatically enable QoS on a switch or VLAN.

BA VLAN can support multiple active MLD snooping queries, as long as each one is associated to

A VLAN supports only one active MLD snooping querier at a time; the election process ensures exactly one winner, so multiple queriers cannot be simultaneously active in the same VLAN.

CAN MLD snooping querier election occurs when any MLD snooping querier goes down or if thereCorrect

An MLD snooping querier election is triggered when an active querier goes down or a topology change occurs that requires a new querier, ensuring the VLAN always has an active querier to maintain multicast group membership.

DWhen multiple MLD snooping queriers are enabled in a VLAN, the querier with the lowest IPCorrect

When multiple MLD snooping queriers are active in the same VLAN, the one with the lowest IP address wins the election and becomes the sole active querier, mirroring the IGMP querier election mechanism.

Concept tested: MLD snooping querier election behavior

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_igmpsnooping/configuration/xe-16/imc-igmpsnooping-xe-16-book/imc-mld-snooping.html

Topics

#MLD snooping#IPv6 multicast#querier election#VLAN

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