Exam 300-420 topic 1 question 142 discussion

Actual exam question from Cisco's 300-420

Question #: 142
Topic #: 1

An organization plans to deploy multicast across two different autonomous systems. Their solution must allow RPs to:
✑ discover active sources outside their domain
✑ use the underlying routing information for connectivity with other RPs
✑ announce sources joining the group
Which solution supports these requirements?

A. SSM
B. MSDP
C. PIM-DM
D. PIM-SM

Show Suggested Answer

Suggested Answer: B 🗳️
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-10/configuration_guide/ip_mcast_rtng/ b_1610_ip_mcast_rtng_9500_cg/b_1610_ip_mcast_rtng_9500_cg_chapter_010001.pdf

by Lungful at Aug. 19, 2023, 12:48 a.m.

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Lungful

9 months, 3 weeks ago

Selected Answer: B

B is correct. "MSDP is also used to announce sources sending to a group. These announcements must originate at the RP of the domain." Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/imc-msdp-im-pim-sim.html MSDP is a mechanism to connect multiple PIM-SM domains. The purpose of MSDP is to discover multicast sources in other PIM domains. The main advantage of MSDP is that it reduces the complexity of interconnecting multiple PIM-SM domains by allowing PIM-SM domains to use an interdomain source tree (rather than a common shared tree). Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book.pdf

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