HPE Aruba Certified Network Security Expert (ACNSX) — Question 108

A network administrator sets up two aggregation layer AOS-CX switches in a VSX pair. The switches have layer-2 VSX LAGS to access layer switches. The VSX pair has IGMP configured on the layer-3 VLAN interfaces serving the access layer switches.
What is correct regarding how the VSX pair will interact with multicast traffic and messages?

Answer options

• A. IGMP snooping must be disabled on the ISL interface to ensure correct multicast traffic forwarding.
• B. Forwarding and pruning of multicast traffic is based on a shared IGMP group database.
• C. Join and leave messages are always forwarded across the ISL link between the VSX aggregate switches.
• D. If one of the VSX switches reboots, the IGMP group database is automatically synchronized between the two switches.

Correct answer: C

Explanation

Option C is correct because join and leave messages must be transmitted across the ISL to ensure proper multicast group management. Option A is incorrect as IGMP snooping should be enabled for optimal multicast forwarding. Option B is wrong since the multicast traffic management doesn't rely on a shared database but on real-time message forwarding. Option D is inaccurate because a reboot does not automatically synchronize the IGMP group database without additional configuration.