28. Which of the following would be a reason that a customer would need to use STUN in their converged network implementation?
A. The customer has SIP endpoints behind a NAT router.
B. The customer has SIP for both telephony and video conferencing.
C. The customer is using T-1 trunks with a SIP-based media gateway.
D. The customer is using a SIP proxy server.
Answer: A
29. Which of the following occurs at layer 3 of the OSI model, and is used for prioritization?
A. User Datagram Protocol (UDP)
B. Real Time Control Protocol (RTCP)
C. DiffServ
D. 802.1p
Answer: C
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