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350-601 · Question #50

Which two statements about multicast routing are true? (choose two)

The correct answer is A. You can define RPF routes for multicast when you want multicast data to diverge from the unicast C. You can define RPF routes for multicast on border routers to enable reverse path forwarding to. 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.

Network

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

How the community answered

(34 responses)
  • A
    91% (31)
  • B
    3% (1)
  • D
    6% (2)

Why each option

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.

AYou can define RPF routes for multicast when you want multicast data to diverge from the unicastCorrect

RPF routes can be explicitly configured for multicast when it is necessary for multicast traffic to follow a path different from the one determined by the unicast routing table, allowing for optimized or policy-based multicast forwarding.

BMulticast routes are used to directly forward traffic without making RPF checks

RPF checks are a fundamental security and loop-prevention mechanism in multicast routing and are always performed before forwarding multicast traffic.

CYou can define RPF routes for multicast on border routers to enable reverse path forwarding toCorrect

Defining RPF routes on border routers is a common practice to ensure that multicast traffic entering or exiting a domain has a correctly configured reverse path back to the source, which is critical for successful RPF checks across different administrative domains.

DRPF routes for multicast can be distributed

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.

EIPv6 static multicast routes are supported

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

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_mroute/configuration/15-mt/imc-mroute-15-mt-book/imc-mroute-cfg-ipmroute.html

Topics

#Multicast Routing#Reverse Path Forwarding (RPF)#Static Multicast Routes#Unicast-Multicast Path Divergence

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