Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 931

How are the different versions of IGMP compatible?

Answer options

• A. IGMPv2 is compatible only with IGMPv2.
• B. IGMPv3 is compatible only with IGMPv3.
• C. IGMPv2 is compatible only with IGMPv1.
• D. IGMPv3 is compatible only with IGMPv1

Correct answer: C

Explanation

The correct answer is C because IGMPv2 can only communicate with IGMPv1, making them compatible. In contrast, IGMPv2 and IGMPv3 are not backward compatible with each other, and IGMPv3 does not support IGMPv1 directly.