Chapter 22.4, Problem 7SC

Program Plan Intro

Port 80:

• Port 80 is the port that the server 'listens to' or intends to receive from a Web client on a Web server or hypertext transfer protocol daemon, assuming that the default was taken when the server was configured or set up.
• A port can be specified on the NCSA server in the range of 0-65536.
• The server administrator however configures the server to recognize just one port number.
• The port number of a Web server is 80, by default.

Reason:

• Port 80 is a standard HTTP port.
• The default web port is 80. When the open some url in client without specifying a port, 80 is used by default.
• If a web server is operating on the same computer, then one can't open a server socket on an open port (port 80) because, it is already in use and it will generate an error.