Implementing Cisco Collaboration Cloud and Edge Infrastructure (CLCEI) — Question 57

Which complication does a NAT introduce in SDP for a SIP call?

Answer options

• A. Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU.
• B. When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.
• C. The IP address specified in the connection data field may be an unrouteable internal address.
• D. The encryption keys advertised in the SDP are only valid for clients not behind a NAT.

Correct answer: C

Explanation

The correct answer is C because when a device is behind a NAT, it often uses a private IP address that cannot be routed on the public internet, causing connection failures. Option A is incorrect because while NAT can add headers, it does not typically cause MTU issues directly. Option B is not relevant to NAT's effects on SDP, and option D is misleading since encryption keys are not inherently affected by NAT presence.