Refer to the exhibit.
Which three statements are correct regarding the Cisco IOS-XR configuration? (Choose three.)
A.
This router, acting as the RP mapping agent, will send RP announcement messages to the
224.0.1.40 group
B.
This router, acting as the RP mapping agent, will send RP discovery messages to the
224.0.1.39 group
C.
This router is the RP mapping agent only for the 224.11.11.11 and 224.99.99.99 multicast
groups
D.
This router is a candidate PIM-SM RP for the 224.99.99.99 multicast group
E.
This router is a candidate PIM-BIDIR RP for the 224.11.11.11 multicast group
F.
IGMPv3 is enabled on all interfaces
G.
Other routers will recognize this router as the RP for all multicast groups with this router
loopback 0 IP address
Candidate-RP sends announcement messages to the 224.0.1.39 group
Mapping-agent sends discovery messages to the 224.0.1.40 group.
ACLs are wrong because the 224.x.y.z IP addresses are not source addresses. ACLs should be:
ipv4 access-list acl1
permit ipv4 any 224.11.11.11 0.0.0.0
ipv4 access-list acl2
permit ipv4 any 224.99.99.99 0.0.0.0
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Answer F incorrect?
The prerequisite for SSM deployment is a mechanism that allows hosts to report not only the group that they want to join, but also the source for the group. This mechanism is built into the IGMPv3 standard.
RPs for SSM groups are not needed, because the discovery of sources is performed via some other method. In fact, routers must not build shared trees for groups in the SSM range (232.0.0.0/8).
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IGMPv3 is backward compatible with IGMPv2 so is answer F right?
The main intention of IGMPv3 is to allow hosts to indicate that they only want to receive traffic from a particular source within a multicast group. This enhancement will allow routers in sparse mode to build a source distribution tree directly, thereby avoiding the RP.
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