Does UDP require a socket?

Does UDP require a socket?

UDP is a very simple protocol. Messages, so called datagrams, are sent to other hosts on an IP network without the need to set up special transmission channels or data paths beforehand. The UDP socket only needs to be opened for communication.

Can multiple UDP sockets on same port?

2 Answers. The only way to associate multiple sockets with a port in TCP is by listening and then accepting. The purpose in that case is to give every incoming client a unique socket so as to keep their byte streams separate. You don’t need that in the case of UDP because there are no byte streams.

How many UDP sockets are there?

A port is a TCP or UDP connection point. Think of them as receptacles on an old-fashioned telephone switchboard. There are 65,536 (or 2^16) ports available for a host to manage connections, numbered from 0 to 65,535 for each TCP and UDP.

What is the difference between a TCP socket and a UDP socket Why would you use one or the other?

TCP is a connection-oriented protocol, whereas UDP is a connectionless protocol. A key difference between TCP and UDP is speed, as TCP is comparatively slower than UDP. Overall, UDP is a much faster, simpler, and efficient protocol, however, retransmission of lost data packets is only possible with TCP.

Can a socket have multiple ports?

A connected socket is assigned to a new (dedicated) port, so it means that the number of concurrent connections is limited by the number of ports, unless multiple sockets can share the same port.

Can 2 applications listen on the same port?

You can only have one application listening on the same port at one time. Now if you had 2 network cards, you could have one application listen on the first IP and the second one on the second IP using the same port number. For UDP (Multicasts), multiple applications can subscribe to the same port.

Do you need more than one UDP socket?

As such, there is generally no need to have more than one UDP socket. UDP is a special protocol where loss of data is permitted / acceptable. Therefore, in a UDP scenario, the receiver doesn’t need to keep reporting back to the server that it successfully received the packets etc.

Why does TCP socket programming need two sockets?

Why does TCP socket programming need two sockets (one welcome socket and one connection socket) but UDP only needs one? Is this because a TCP connection is a persistent connection, so the server needs simultaneous process many request, therefore needing different connection sockets?

Where is the data stored in a TCP socket?

All of this is stored in a separate internal data structure that is associated specifically with that new socket, which will be updated until that new socket is close ()’d, at which point it will be discarded.

What happens when you close a socket in TCP?

That data structure will be updated for as long as the socket exists, and will be discarded when you close () that socket.