What must be enabled on the interface of a multicast-enabled device to support the Source Specific
Multicast feature?
A.
IGMP version 3
B.
IGMP version 2
C.
IGMP version 1
D.
PIM
Explanation:
IGMP is the Internet Engineering Task Force (IETF) standards track protocol used for hosts to signal
multicast group membership to routers. Version 3 of this protocol supports source filtering, which is
required for SSM. To run SSM with IGMPv3, SSM must be supported in the Cisco IOS router, the host
where the application is running, and the application itself. IGMP v3lite and URD are two Ciscodeveloped transition solutions that enable the immediate development and deployment of SSM
services, without the need to wait for the availability of full IGMPv3 support in host operating
systems and SSM receiver applications. IGMP v3lite is a solution for application developers that
allows immediate development of SSM receiver applications switching to IGMPv3 as soon as it
becomes available. URD is a solution for content providers and content aggregators that enables
them to deploy receiver applications that are not yet SSM enabled (through support for IGMPv3).
IGMPv3, IGMP v3lite, and URD interoperate with each other, so that both IGMP v3lite and URD can
easily be used as transitional solutions toward full IGMPv3 support in hosts.http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfssm.html