TCP versus UDP
There are several differences between TCP and UDP. These differences include the following:
- Reliability: TCP is more reliable than UDP
- Ordering: TCP guarantees the order of packet transmission will be preserved
- Header size: The UDP header is smaller than the TCP header
- Speed: UDP is faster than TCP
When a packet is sent using TCP, the packet is guaranteed to arrive. If it is lost, then it is re-sent. UDP does not offer this guarantee. If the packet does not arrive, then it is not re-sent.
TCP preserves the order that packets are sent in, while UDP does not. If the TCP packets arrive at a destination in a different order than how they were sent, TCP will reassemble the packets in their original order. With UDP, this ordering is not preserved. ...
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