Can multiple users use 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.

How many users can connect to a port?

Irrespective of stateful or stateless protocols, two clients can connect to same server port because for each client we can assign a different socket (as client IP will definitely differ). Same client can also have two sockets connecting to same server port – since such sockets differ by SRC-PORT .

How does a Web server handle multiple requests on same port?

If a server uses a number of sub-processes in order to serve multiple requests by allocating each socket to one sub-process then it is known as a multi-threaded server. This is how the server handles multiple connections at a time.

Can I use the same port number for server and client?

The client and server don’t need to use the same port. As you pointed out, a port can only be allocated to a single process at a time on a machine. To be more correct, a port and IP address pair is the allocation unit. So if your machine has two addresses or more one can bind the port to different processes per IP.

Do web servers only use port 80?

Port 80 is the default for unencrypted HTTP traffic, while port 443 is the default for encrypted HTTPS traffic. Ports 8080 and 8888 are other common ones used as alternate ports for web server traffic.

How many simultaneous connections can a Web server handle?

On the TCP level the tuple (source ip, source port, destination ip, destination port) must be unique for each simultaneous connection. That means a single client cannot open more than 65535 simultaneous connections to a single server. But a server can (theoretically) serve 65535 simultaneous connections per client.

Can client and server be the same?

Answer: Yes, TCP/IP socket server and client applications can be executed on the same machine. TCP Client and server programs are two different and independent application. Just tcp client has to connect to correct address of the tcp server.