CCDE: Cisco Certified Design Expert (Written) — Question 52

A company wants to use SSM as the multicast routing protocol inside its network. Some of its multicast applications do not support IGMPv3. In which two ways can the mapping be done when these applications send IGMPv2 join messages? (Choose two.)

Answer options

• A. The Layer 2 switches can send a request to a DNS server.
• B. The Layer 3 multicast routers can send a request to a DNS server.
• C. The mapping can be done statically at the Layer 2 switches.
• D. The mapping can be done statically at the Layer 3 multicast routers.
• E. The Layer 2 switches can transform the IGMPv2 join to an IGMPv3lite join.
• F. The Layer 3 multicast routers can transform the IGMPv2 join to an IGMPv3lite join.

Correct answer: B, D

Explanation

The correct answers are B and D because Layer 3 multicast routers are responsible for managing multicast traffic and can handle the mapping of IGMPv2 to SSM. Static mapping at Layer 3 multicast routers ensures that the routing is correctly established. The other options are incorrect as DNS requests are not a method of mapping for multicast routing, and Layer 2 switches do not typically perform this mapping function.