350-601 · Question #50
350-601 Question #50: Real Exam Question with Answer & Explanation
The correct answer is A: You can define RPF routes for multicast when you want multicast data to diverge from the unicast. Multicast routing uses Reverse Path Forwarding (RPF) to prevent loops, and RPF routes can be specifically defined on routers to direct multicast traffic, especially on border routers or when the multicast path needs to differ from the unicast path.
Question
Which two statements about multicast routing are true? (choose two)
Options
- AYou can define RPF routes for multicast when you want multicast data to diverge from the unicast
- BMulticast routes are used to directly forward traffic without making RPF checks
- CYou can define RPF routes for multicast on border routers to enable reverse path forwarding to
- DRPF routes for multicast can be distributed
- EIPv6 static multicast routes are supported
Explanation
Multicast routing uses Reverse Path Forwarding (RPF) to prevent loops, and RPF routes can be specifically defined on routers to direct multicast traffic, especially on border routers or when the multicast path needs to differ from the unicast path.
Common mistakes.
- B. RPF checks are a fundamental security and loop-prevention mechanism in multicast routing and are always performed before forwarding multicast traffic.
- D. While RPF information can be derived from distributed unicast routing protocols, the statement 'RPF routes for multicast can be distributed' is less precise about defining them and their purpose compared to the specific scenarios in A and C.
- E. While IPv6 static multicast routes are generally supported in modern network devices, this statement doesn't describe a unique characteristic or specific scenario of multicast routing related to RPF in the same way A and C do.
Concept tested. Multicast RPF, static RPF routes
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