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Exam 350-801 topic 1 question 221 discussion

Actual exam question from Cisco's 350-801
Question #: 221
Topic #: 1
[All 350-801 Questions]

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

  • A. timestamp
  • B. CSRC (Contributing source ID)
  • C. sequence number
  • D. SSRC (Synchronization source identifier)
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Suggested Answer: C 🗳️
Reference:
https://www.oreilly.com/library/view/packet-guide-to/9781449339661/ch04.html
by MaxG at June 14, 2023, 5:02 p.m.

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MaxG
10 months, 3 weeks ago
Selected Answer: C
Sequence numbers - This 2-byte field contains the number referencing a particular packet and can help in detecting lost packets and placing the packets in the correct order. However, we have to remember that these are part of a UDP stream, and so sequencing is not tightly controlled by the host. These numbers increase by one for each packet sent by the same source. RFC 3550 recommends that these numbers start at a random value to make them less predictable
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