300-420 Question #351: Real Exam Question with Answer & Explanation

Question

A network architect is enabling TV services in the LAN. The source will be streaming to the 239.1.1.1 group IP address. Dense mode is not allowed in the network. Multicast has already been enabled on all network devices in the LAN segment. Which action must the architect take to finalize the design?

Options

• AEnable PIM SSM.
• BEnable PIM Auto-RP.
• CEnable PIM Anycast RP.
• DEnable PIM BSR.

Explanation

Given that dense mode is disallowed and a specific group IP address in the SSM range is used for TV services, the architect must enable PIM SSM to finalize the multicast design.

Common mistakes.

• B. PIM Auto-RP is an intra-domain mechanism for Rendezvous Point (RP) discovery in PIM Any Source Multicast (ASM), which is not used in PIM SSM.
• C. PIM Anycast RP is a high-availability solution for RPs in PIM ASM, which is unnecessary for PIM SSM as it does not use an RP.
• D. PIM BSR (Bootstrap Router) is another intra-domain mechanism for RP discovery in PIM ASM, which is not applicable to PIM SSM.

Concept tested. PIM Source Specific Multicast (SSM)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-3s/imc-pim-xe-3s-book/imc-ssm-pim.html

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