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352-001 · Question #783

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 behavior relies on an election process where only one querier is active per VLAN at a time, with elections triggered by querier failures or new querier appearances.

Layer 2 Control Plane

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 a
  • 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

(25 responses)
  • A
    4% (1)
  • B
    8% (2)
  • C
    88% (22)

Why each option

MLD snooping querier behavior relies on an election process where only one querier is active per VLAN at a time, with elections triggered by querier failures or new querier appearances.

AWhen MLD snooping is enabled, QoS is automatically enabled.

MLD snooping and QoS are entirely independent features; enabling MLD snooping does not automatically enable or configure QoS on the switch.

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

A VLAN supports only one active MLD snooping querier at a time; the querier election process exists precisely to enforce this single-querier constraint.

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

When an MLD snooping querier goes down or a new one appears, an election is triggered to maintain exactly one active querier per VLAN - this mirrors IGMP querier election behavior and is fundamental to preventing duplicate query flooding.

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

When multiple MLD snooping queriers exist in a VLAN, the one with the lowest IP address wins the election and becomes the sole active querier, ensuring only one device sends MLD general queries on the segment.

Concept tested: MLD snooping querier election process

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_igmp/configuration/xe-16/imc-igmp-xe-16-book/ipv6-mld-snooping.html

Topics

#MLD snooping#multicast#querier election#VLAN

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