200-150 · Question #171
When comparing TCP and UDP segments, which two fields are found only in TCP segment? (Choose two.)
The correct answer is B. acknowledgement E. Sequence number. TCP is a connection-oriented, reliable protocol, while UDP is connectionless and does not guarantee delivery. To support reliability and ordered delivery, TCP includes fields that UDP does not: the Sequence Number (E) tracks the byte position of each segment so the receiver can r
Question
When comparing TCP and UDP segments, which two fields are found only in TCP segment? (Choose two.)
Options
- AChecksum
- Backnowledgement
- Clength
- Dsource
- ESequence number
How the community answered
(38 responses)- A3% (1)
- B89% (34)
- C3% (1)
- D5% (2)
Explanation
TCP is a connection-oriented, reliable protocol, while UDP is connectionless and does not guarantee delivery. To support reliability and ordered delivery, TCP includes fields that UDP does not: the Sequence Number (E) tracks the byte position of each segment so the receiver can reorder them, and the Acknowledgement Number (B) tells the sender which bytes have been received, enabling retransmission of lost data. UDP has no need for these fields. By contrast, both TCP and UDP include a Checksum (A) for error detection and a Source Port (D). The Length field (C) appears in UDP headers (to indicate datagram size) but not in TCP headers, where length is inferred from the IP header.
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