CCNA Cisco Certified Network Associate Study Guide - FTP Server

Telnet
� SMTP
� LPD
� X Window
� SNMP
� DNS
� BootP
� DHCP
TCP/IP and the DoD Model 103
Telnet is the chameleon of protocols—its specialty is terminal emulation. It
allows a user on a remote client machine, called the Telnet client, to access
the resources of another machine, the Telnet server. Telnet achieves this by
pulling a fast one on the Telnet server and making the client machine appear
as though it were a terminal directly attached to the local network. This projection
is actually a software image, a virtual terminal that can interact with
the chosen remote host.
These emulated terminals are of the text-mode type and can execute
refined procedures like displaying menus that give users the opportunity to
choose options from them and access the applications on the duped server.
Users begin a Telnet session by running the Telnet client software and then
logging on to the Telnet server.
The name Telnet comes from “telephone network,” which is how most Telnet
sessions used to occur.
File Transfer Protocol (FTP)
The File Transfer Protocol (FTP) is the protocol that actually lets us transfer
files; it can facilitate this between any two machines using it. But FTP isn’t
just a protocol; it’s also a program. Operating as a protocol, FTP is used by
applications. As a program, it’s employed by users to perform file tasks by
hand. FTP also allows for access to both directories and files and can accomplish
certain types of directory operations, like relocating into different ones.
FTP teams up with Telnet to transparently log you in to the FTP server and
then provides for the transfer of files.