Which two conditions must be met before separate ISPs can provide interdomain multicast routing? (Choose two.)

Question

Options

• AEach ISP must configure MSDP to connect its individual multicast administrative domain to the
• BEach ISP must dedicate a single router to handle multicast traffic between providers.
• CEach ISP must replace its RP assignment with a global RP.
• DEach ISP must configure its network to use PIM-DM.
• EEach ISP must support intradomain multicast routing.

• A
  85% (22)
• B
  8% (2)
• C
  4% (1)
• D
  4% (1)

Explanation

For interdomain multicast routing to function across separate ISP boundaries: (E) Each ISP must first have intradomain multicast routing operational - internal PIM (typically PIM-SM) and a Rendezvous Point (RP) must be configured within each provider's domain before cross-domain communication is possible. (A) Each ISP must configure MSDP (Multicast Source Discovery Protocol) - MSDP connects the RPs of separate PIM-SM domains, allowing them to share information about active multicast sources. Without MSDP, a receiver in one ISP domain cannot learn about sources in another ISP's domain. Option B is incorrect as no single dedicated router is required. Option C is wrong because MSDP allows each ISP to retain its own RP. Option D is wrong because PIM-DM is inefficient and not required.

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