Cisco Collaboration endpoints are exchanging encrypted signaling messages. What is one major complication in implementing NAT ALG for voice and video devices?
A) Internal endpoints cannot use addresses from the private address space.
B) The NAT ALG cannot inspect the contents of encrypted signaling messages.
C) NAT ALG introduces jitter in the voice path.
D) Source addresses cannot provide the destination addresses that remote endpoints should use for return packets.

Question

Quizplus · Accepted Answer

NAT ALG (Application Layer Gateway) cannot inspect the contents of encrypted signaling messages, which makes it difficult to modify the necessary information for NAT traversal.

Cisco Collaboration Endpoints Are Exchanging Encrypted Signaling Messages