Which statement correctly describes data transmission at the transport layer?
- Retransmission of lost packets is provided by both TCP and UDP.
- Segmentation is provided by the window size field when the TCP protocol is used.
- A single datagram can include both a TCP and a UDP header.
- Both UDP and TCP use port numbers.
- Segmentation is provided by sequence numbers when UDP is used.
Explanation: Segmentation is handled at Layer 4 by TCP sequence numbers. UDP does not have sequence numbers in the header, but instead, lets the application handle reordering if it is necessary. Only TCP provides reliable deliver and retransmits data. Each segment has either a TCP header or a UDP header; it cannot contain both.
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