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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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How to Use MSDP to Interconnect Multiple PIM-SM Domains Perform the following tasks to use MSDP to interconnect multiple PIM-SM domains. The first task is required; all other tasks are optional.
What a brutal question but also a great way to understand the components of MSDP, a protocol that I am unlikely to use or seen to be used ever: MSDP is a mechanism to connect multiple PIM-SM domains, it's purpose is to discover multicast sources in other PIM-SM domains. Allows a RP to dynamically discover active sources outside of its domain. 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#GUID-4B201DB3-2C27-4F98-977A-A1AE9DC39C21
If you read the Link that was shared by Daaid, https://www.cisco.com/c/en/us/td/docs/ios/12_4t/ip_mcast/configuration/guide/mctmsdp.html#wp1054452 And ten we review The Answers in reverse order. D is Correct - MSDP messages are used to advertise Active sources but this doesn't addrress the "Interconnect" part of the question. C is also correct. According to this document MSDP does require BGP or MBGP but this is a requirement of MSDP and again doesn't address the "Interconnect" issue. B is wrong - MSDP uses SA messages to advertise active sources, not to request a list of sources. A is also Correct and this directly addresses the issue of Interconnecting Multiple PIM-SM Domains