A network includes a mix of IGMPv2 and IGMPv3 endpoints and must support the following source specific multicasting applications: Source: 10.1.4.2 and Group: 232.0.5.5 Source: 10.1.4.12 and Group…

Question

Options

• ACreate an SSM policy that includes 232.0.5.5 and 232.0.6.6 within its range
• BEnable IGMPv2 backward compatibility mode
• CConfigure two SSM maps, each of which maps a source to its multicast group
• DEnable PIM SSM on the interfaces that connect to the endpoints

• A
  8% (3)
• B
  3% (1)
• C
  75% (30)
• D
  15% (6)

Explanation

When both SSM mapping and IGMPv3 are enabled, the router will send out IGMPv3 membership query messages instead of IGMPv3 membership messages. If the receiver hosts that are to be supported with SSM mapping can only support IGMPv1 or IGMPv2, then enabling SSM mapping on an interface with IGMPv3 is fine. IGMPv3 membership query messages will be interpreted as IGMPv1 or IGMPv2 queries and the host will continue to report with IGMPv1 or IGMPv2 reports. SSM is a datagram delivery model that best supports one-to-many applications, also known as broadcast applications. SSM is a core networking technology for the implementation of IP multicast solutions targeted for audio and video broadcast application environments and is described in RFC 3569. The following two components together support the implementation of * Protocol Independent Multicast source-specific mode (PIM-SSM) * Internet Group Management Protocol Version 3 (IGMPv3) PIM-SSM is the routing protocol that supports the implementation of SSM and is derived from PIM sparse mode (PIM-SM). IGMP is the Internet Engineering Task Force (IETF) standards track protocol used for hosts to signal multicast group membership to routers. IGMPv3 supports source filtering, which is required for SSM. For SSM to run with IGMPv3, SSM must be supported in the Cisco IOS router, the host where the application is running, and the application itself.

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