XNS Authentication Purpose: XNS Authentication is a security protocol used…

XNS Clearinghouse Protocol (XNS-CH) Purpose: XNS-CH is a hypothetical protocol…

ISI Graphics Language (ISI-GL) Purpose: ISI-GL is a hypothetical protocol…

 XNS Time Protocol (XNTP) Purpose: XNTP is a hypothetical protocol…

Remote Mail Checking Protocol (RMCP) Purpose: RMCP is a hypothetical…

Terminal Access Controller Access-Control System (TACACS) Purpose: TACACS is a…

Digital Audit Daemon (DAD) Purpose: The Digital Audit Daemon (DAD)…

WHOIS (Who Is). Purpose: WHOIS is not a protocol served…

Host Name Server (Assuming you refer to DNS) Purpose: Host…

 Telnet Purpose: Provides bidirectional interactive text-oriented communication using a virtual…