CCIE Data Center (legacy) — Question 87

A user requests one primary VLAN, two community VLANs, and two isolated VLANs for multicast capable servers that must transmit multicast traffic and receive multicast traffic through the use of IGMPv2.
On which VLAN must the IGMP querier be configured?

Answer options

• A. only the primary VLAN
• B. Layer 2 multicast is not supported when using private VLANs
• C. isolated VLAN and both community VLANs
• D. primary and secondary VLANs

Correct answer: C

Explanation

The IGMP querier should be configured on the isolated VLAN and both community VLANs because these are the segments that need to manage multicast traffic. Option A is incorrect as the primary VLAN alone does not cover the community and isolated VLANs. Option B is wrong since multicast can be supported in private VLANs when properly configured, and option D is incorrect as the secondary VLANs do not require an IGMP querier.