Difference between TCP and UDP
There are two types of internet protocol (IP) traffic, and both have very
different uses.
- TCP(Transmission Control Protocol). TCP is a connection-oriented
protocol, a connection can be made from client to server, and from then on any
data can be sent along that connection.
- Reliable - when you send a message along a TCP socket, you know
it will get there unless the connection fails completely. If it gets lost along
the way, the server will re-request the lost part. This means complete
integrity, things don't get corrupted.
- Ordered - if you send two messages along a connection, one after
the other, you know the first message will get there first. You don't have to
worry about data arriving in the wrong order.
- Heavyweight - when the low level parts of the TCP "stream" arrive
in the wrong order, resend requests have to be sent, and all the out of sequence
parts have to be put back together, so requires a bit of work to piece together.
- UDP(User Datagram Protocol). A simpler message-based
connectionless protocol. With UDP you send messages(packets) across the network
in chunks.
- Unreliable - When you send a message, you don't know if it'll get
there, it could get lost on the way.
- Not ordered - If you send two messages out, you don't know what
order they'll arrive in.
- Lightweight - No ordering of messages, no tracking connections,
etc. It's just fire and forget! This means it's a lot quicker, and the network
card / OS have to do very little work to translate the data back from the
packets.
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