TCP vs UDP
阿新 • • 發佈：2018-03-27
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Connection |
TCP is a connection-oriented protocol. | UDP is a connectionless protocol. |
|---|---|---|
| Function | As a message makes its way across the internetfrom one computer to another. This is connection based. | UDP is also a protocol used in message transport or transfer. This is not connection based which means that one program can send a load of packets to another and that would be the end of the relationship. |
| Usage | TCP is suited for applications that require high reliability, and transmission time is relatively less critical. | UDP is suitable for applications that need fast, efficient transmission, such as games. UDP‘s stateless nature is also useful for servers that answer small queries from huge numbers of clients. |
| Use by other protocols | HTTP, HTTPs, FTP, SMTP, Telnet | DNS, DHCP, TFTP, SNMP, RIP, VOIP. |
| Ordering of data packets | TCP rearranges datapackets in the order specified. | UDP has no inherent order as all packets are independent of each other. If ordering is required, it has to be managed by the application layer. |
| Speed of transfer | The speed for TCP is slower than UDP. | UDP is faster because error recovery is not attempted. It is a "best effort" protocol. |
| Reliability | There is absolute guarantee that the data transferred remains intact and arrives in the same order in which it was sent. | There is no guarantee that the messages or packets sent would reach at all. |
| Header Size | TCP header size is 20 bytes | UDP Header size is 8 bytes. |
| Common Header Fields | Source port, Destination port, Check Sum | Source port, Destination port, Check Sum |
| Streaming of data | Data is read as a byte stream, no distinguishing indications are transmitted to signal message (segment) boundaries. | Packets are sent individually and are checked for integrity only if they arrive. Packets have definite boundaries which are honored upon receipt, meaning a read operation at the receiver socket will yield an entire message as it was originally sent. |
| Weight | TCP is heavy-weight. TCP requires three packets to set up a socket connection, before any user data can be sent. TCP handles reliability and congestion control. | UDP is lightweight. There is no ordering of messages, no tracking connections, etc. It is a small transport layer designed on top of IP. |
| Data Flow Control | TCP does Flow Control. TCP requires three packets to set up a socket connection, before any user data can be sent. TCP handles reliability and congestion control. | UDP does not have an option for flow control |
| Acknowledgement | Acknowledgement segments | No Acknowledgment |
|---|---|---|
| Handshake | SYN, SYN-ACK, ACK | No handshake (connectionless protocol) |
TCP vs UDP