Designing Cisco Enterprise Networks (ENSLD) — Question 193

When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

Answer options

• A. encapsulation of traffic with GRE or VTI
• B. IPsec forwarding using transport mode
• C. additional bandwidth for headend
• D. IPsec forwarding using tunnel mode

Correct answer: A

Explanation

The correct answer is A because encapsulating multicast traffic using GRE or VTI is necessary for proper handling of this type of traffic in IPsec VPNs. The other options do not provide the necessary support for multicast, as transport mode (B) and tunnel mode (D) do not encapsulate multicast traffic effectively, and additional bandwidth (C) is not a unique requirement for multicast support.