Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 269

Which field of a Real-Time Transport Protocol packet allows receiving devices to detect lost packets?

Answer options

• A. timestamp
• B. CSRC (Contributing source ID)
• C. sequence number
• D. SSRC (Synchronization source identifier)

Correct answer: C

Explanation

The sequence number is crucial for detecting lost packets because it increments with each packet sent, allowing the receiver to identify any gaps in the sequence. The timestamp is used for synchronization, CSRC identifies contributing sources, and SSRC is for synchronization source identification, none of which directly indicate lost packets.