The network designer needs to consider the number of multicast applications and sources in the network to provide the most robust network possible. Which of the following is a consideration the…

Question

Options

• AThe IGPs should utilize authentication to avoid being the most vulnerable component
• BWith SSM source or receiver attacks are not possible
• CWith Shared Trees access control is always applied at the RP
• DLimit the rate of Register messages to the RP to prevent specific hosts from being attacked on a

• A
  12% (6)
• B
  62% (32)
• C
  21% (11)
• D
  6% (3)

Explanation

Answer B is correct. Source-Specific Multicast (SSM) eliminates the Rendezvous Point (RP) by requiring receivers to know and explicitly join a specific (source, group) pair. Because there is no shared RP and no Shared Tree, SSM inherently prevents source spoofing attacks (a rogue source cannot inject traffic into a group stream) and receiver attacks (a receiver cannot join arbitrary groups without knowing the exact source). This makes SSM the most secure multicast model. Option A is about IGP security, which is a separate concern. Option C is incorrect - with Shared Trees (ASM), access control is not always applied at the RP; it must be explicitly configured. Option D describes rate-limiting Register messages, which is a mitigation but does not prevent host-level attacks.

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