200-301 Question 109
Single answerYou are configuring multicast in a network that uses PIM (Protocol Independent Multicast) Sparse Mode. A router in your network should act as a Rendezvous Point (RP) for multicast groups in the range 239.0.0.0/8. Which configuration step is necessary to designate this router as the RP?
- A
Configure a static RP address on all routers in the multicast domain.
- B
Enable IGMP Snooping on all switches in the network.
- C
Use the 'ip pim rp-address' command on the router intended to be the RP.
- D
Configure MSDP (Multicast Source Discovery Protocol) between all routers in the network.
Show answer and explanation
Correct answer: C
Explanation
In PIM Sparse Mode, multicast traffic relies on a Rendezvous Point (RP) to control group membership and manage multicast streams. To designate a router as the RP, the 'ip pim rp-address' command must be used. This ensures that the router can serve as a central point for multicast group management, enabling efficient traffic distribution in the multicast domain.
- A. Incorrect.
While configuring a static RP address is an option, this must be done on all routers in the multicast domain and not just on the RP itself. This option does not directly designate a router as the RP.
- B. Incorrect.
IGMP Snooping is used to limit multicast traffic at the Layer 2 level, but it is not used to configure a router as the RP.
- C. Correct.
The 'ip pim rp-address' command is used to designate a router as the RP in a multicast network. This is the correct configuration step for this scenario.
- D. Incorrect.
MSDP is used for sharing multicast source information between RPs in different multicast domains. It is not used to configure a router as the RP.