Telnet service permits a user to connect to the server and run a program there. FTP allows users to move files into and out of the server. These simple, basic services are traditional components of all TCP/IP networks. The Internet service daemon (inetd) or the Extended Internet service daemon (xinetd) starts these and many other network services. The system administrator must configure inetd.conf or xinetd.conf to start the services that will be offered by his network server.
Telnet, FTP, and many other network services need to identify the user to grant access and control file permission. Therefore, the users of many network services must have valid user accounts on the server. Linux provides an array of tools that the system administrator can use to maintain user accounts.
The extensive list of network services started by inetd or xinetd is not the whole story. Some of the most important network services are started independently of inetd and xinetd. The next four chapters discuss four of these important services: Domain Name System, sendmail, Web service, and routing. The discussion of these Internet services begins in Chapter 4, with the configuration of the Domain Name System (DNS).
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