There are various host computers on the Internet which offer services to
other systems on the Internet. Computers that offer services for other
system to use their services called servers. Server contain all the
records of all machines connected to it
Server computer is the main component used in networking. And gives the virtual access to the host computer
Here are some types of servers and clients that you may meet
Mail servers
Mail server are responsible for mailing activities of the system. Post Office Protocol (POP) servers (or POP3 servers) store incoming mail,
while
Simple Mail Transfer Protocol (SMTP) servers relay outgoing mail. Web servers
Store Web pages and send them in response to requests from Web clients, which are usually called browsers.
FTP servers Store files that you can transfer to or from your computer if you have a FTP client.
New servers
Store Usenet newsgroup articles that you can read and send if
you have a new client or newsreader.
IRC servers
Act as a switchboard for Internet-based online chats. To take part, you use an IRC client.
There are some standard numbers for port which used throughout the internet. Some widely used ports listed below Port 21 FTP (file transfer) Port 23 Telnet (remote log in) Port 25 SMTP (mail relaying) Port 80 World Wide Web Port 110 POP3 (storage of incoming mail) Port 194 (as well as 6667 and many others) IRC (online chat) Port 532 Usenet newsgroups (discussion groups)
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