Network servers

Authentication - NIS/NIS+, Kerberos, SRP

Certificate - X.509

DHCP

DNS

Email - SMTP, POP, IMAP, SPOP, SIMAP

File / print - NFS, Samba, LPD

Firewall - IPFWADM, IPCHAINS

FTP - Wu-FTPD, ProFTPD

LDAP - OpenLDAP

News - Usenet news, INN

proxy - Socks, Squid, DeleGate

Shell - Telnet, SSH, SSL-Telnet, etc

SNA

SNMP

Time - NTP

User information - Finger, Identd

WWW - HTTP, HTTPS

WWW based email

X windows

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