Typischerweise mehrere Applikationen pro Rechner. Well-Known Services. Nur ein Anbieter pro Service und Rechner. http: HyperText Transfer Protocol. ftp: File Transfer Protocol. telnet, rlogin, rsh, ssh: Secure/Remote Shells. smtp: Simple Mail Transfer Protocol. domain: Domain Name Service (DNS). ntp: Network Time Protocol. nfs: Network File System. Dienstadressen (Ports).

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