During a corporate merger, a network designer is asked for a solution that will provide connectivity between the two enterprise networks. The solution must have the ability to support video sessions so that the CEO can message merger activities to the employees. The designer decides to consider multicast as a transport with MSDP to provide redundancy. Which transport feature does the network designer need to apply to the interconnecting firewall to ensure that Source-Active messages between the MSDP peers can be sent in both enterprise networks?

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C. unicast over a TCP connection MSDP establishes a TCP session on port 639 between peer routers using their unicast addresses to reliably exchange Source-Active messages. Because TCP provides reliable, ordered delivery, SA messages are guaranteed to reach the remote peer even across a firewall, provided the firewall permits TCP traffic on that port between the two unicast peer addresses.

Answer

A. unicast over a UDP connection MSDP does not use UDP; the protocol requires TCP to ensure reliable, ordered delivery of Source-Active messages between peers.

Answer

B. multicast over a UDP connection MSDP peer sessions are unicast, not multicast - peers communicate directly using their individual IP addresses rather than a multicast group address.

Answer

D. multicast over a TCP connection MSDP uses unicast addressing between peers, so multicast transport is incorrect regardless of whether TCP or UDP is considered.

During a corporate merger, a network designer is asked for a solution that will provide connectivity between the two enterprise networks. The solution must have the ability to support video sessions…

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