CCNP CCNP Multicast and IPv6 2

Question 1

What is the role of the Rendezvous Point (RP) in PIM Sparse Mode (PIM-SM)?

Accepted Answer

Acts as the meeting point where sources register and receivers join to establish multicast distribution trees

Answer

The RP in PIM-SM is the central point where sources register their multicast streams and receivers send join messages to form the shared tree.

Question 2

Which protocol do hosts use to signal their membership in a multicast group to a local router?

Accepted Answer

IGMP (Internet Group Management Protocol)

Answer

IGMP is used between hosts and their directly connected multicast routers to report group membership and receive multicast traffic.

Question 3

What is the multicast address range defined by IANA for general use?

Accepted Answer

224.0.0.0 to 239.255.255.255

Answer

The full IPv4 multicast address range is 224.0.0.0 to 239.255.255.255 (Class D), though specific sub-ranges are reserved for link-local, global, and administratively scoped use.

Question 4

What is the purpose of the RPF (Reverse Path Forwarding) check in multicast routing?

Accepted Answer

Ensures multicast packets arrive on the interface that the router would use to reach the source, preventing loops

Answer

RPF check prevents multicast routing loops by only accepting multicast packets that arrive on the correct upstream interface toward the source.

Question 5

What is Source-Specific Multicast (SSM)?

Accepted Answer

A multicast model where receivers specify both the group address and the specific source they want to receive from

Answer

SSM uses the 232.0.0.0/8 address range and allows receivers to specify the exact (S,G) source-group pair, eliminating the need for an RP.

CCNP - Cisco Certified Network Professional Practice Test

CCNP - Cisco Certified Network Professional Practice Test

CCNP CCNP Multicast and IPv6 2