This session covers installing, configuring and using telnet server (on a Ubuntu Server machine). It is also shown as how we can run telnet service under xinetd (extended internet daemon). The telnet server is accessed using telnet client running on a Linux client as well as a Windows client. It also covers how telnet communication is unsecure and proves this using wireshark (a packet sniffer that capture NW packets in real time and display them in human readable format).