Which difference should be considered when intradomain or interdomain multicast routing is implemented?

Question

Options

• AInterdomain multicast routing requires an IS-IS or OSPF neighbor relationship between the domains
• BInterdomain multicast routing relies on PIM-DM and intradomain multicast routing relies on PIM- SM.
• Cinterdomain multicast routing uses BIDR-PIM to establish neighbor relationships between AS and
• DA network uses intradomain multicast routing without interdomain routing but networks that use

• A
  8% (2)
• C
  4% (1)
• D
  88% (23)

Explanation

Intradomain multicast routing operates entirely within a single autonomous system using PIM (SM or DM) and does not require any inter-AS coordination. A network can fully deploy intradomain multicast without ever enabling interdomain multicast. However, interdomain multicast routing-which spans multiple autonomous systems-depends on intradomain multicast already being functional within each participating AS, because the inter-AS signaling (via MSDP and BGP multicast extensions such as MBGP) must hand off to the intra-AS PIM infrastructure at each domain boundary. Therefore, intradomain can exist without interdomain, but interdomain cannot function without intradomain as its foundation.

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