300-420 · Question #387
A company wants to enable several third-party video conferencing networks based on multicast services. The video conferencing platform can accommodate numerous and dispersed senders and receivers in…
The correct answer is A. Enable BIDIR-PIM. Bidirectional PIM (BIDIR-PIM) is specifically designed for many-to-many multicast applications where there are numerous, distributed senders and receivers - exactly the video conferencing scenario described. Unlike PIM-SM, which builds source-specific trees and requires each…
Question
A company wants to enable several third-party video conferencing networks based on multicast services. The video conferencing platform can accommodate numerous and dispersed senders and receivers in third-party networks. The interior routing protocol is OSPF and the exterior routing protocol is BGP. Which multicast mode must be selected to achieve this goal?
Options
- AEnable BIDIR-PIM
- BConfigure MS DP
- CEnable MP-BGP
- DSet IGMPv2
How the community answered
(46 responses)- A74% (34)
- B15% (7)
- C7% (3)
- D4% (2)
Explanation
Bidirectional PIM (BIDIR-PIM) is specifically designed for many-to-many multicast applications where there are numerous, distributed senders and receivers - exactly the video conferencing scenario described. Unlike PIM-SM, which builds source-specific trees and requires each source to register with the RP, BIDIR-PIM builds a single shared bidirectional tree rooted at the RP. Traffic flows both toward and away from the RP without per-source state on intermediate routers, making it far more scalable when senders are numerous and widely dispersed. MSDP (option B) connects separate PIM-SM domains but still requires source-specific trees and is more complex. MP-BGP (option C) carries multicast routing information but is not itself a multicast forwarding mode. IGMPv2 (option D) is a host-to-router group membership protocol, not a PIM forwarding mode.
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