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…

 Secure Shell (SSH).  Purpose: Provides secure encrypted communication and remote…

 File Transfer Protocol (FTP).  Purpose: Facilitates the transfer of files…

 Message Send Protocol (MSP). Purpose: Message Send Protocol is a…

ECHO (also known as ICMP Echo). Purpose: ECHO is primarily…

Remote Job Entry (RJE). Purpose: Facilitates the submission and execution…