Refer to the exhibit.
Multicast traffic from 192.168.25.6 to 228.0.0.0/8 is entering the router on xe-3ft)/0. Which
statement is correct?
A.
The reverse-path forwarding lookup will succeed without these policies because of a default
route.
B.
The traffic to 228.0.0.0/3 will be rejected.
C.
The traffic from 192.168.25.6 will be rejected.
D.
The reverse-path forwarding lookup will fail without these policies.
Explanation:
Why is it not A?
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http://www.juniper.net/documentation/en_US/junos13.3/topics/example/mcast-rpf-policy.html
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I think answer should be A too.
These policies block RPF lookup, so without them, RFP lookup succeeds.
This is coming directly from line above from jslaven
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I think it’s D. As the multicast traffic is arriving on a different interface to its route back to the source, the RPF check would fail without this policy.
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Answer is “A”
An RPF policy behaves like an import policy. If no policy term matches the input packet, the default action is to accept (that is, to perform the RPF check).
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But because the inbound interface is different than the outgoing interface the rpf check would fail since the router does not have an exact route back to the source.
so it should be D
You want to use the policies to tell the router to NOT perform an RPF check on the incoming packets destined to/from that source/group.
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Answer is “D” its very tricky in question, RPF is disabled to enable the checking of traffic coming on egress interface is actually RPF or not!!!!
so check and filter and use the default behavior these policies need to be configured.
this question is exactly the same as in this example even the IP’s…
http://www.juniper.net/documentation/en_US/junos13.3/topics/example/mcast-rpf-policy.html
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