Linux RHEL6

                                                           WHAT IS YUM,FTP,SFTP,SSH,TELNET
YUM SERVER:-YUM (Yellow Dog Updater Modified) Is An Open Source Command-Line As Well As Graphical Based Package Management Tool For RPM (Red Hat Package Manager) Based Linux Systems. It Allows Users and System Administrator to Easily Install, Update, Remove or Search Software Packages on Systems helps us to manage packages.
What is the main use of yum server in Linux:-if whenever we want to install any rpm packages or every packages are dependent on their dependencies to work or install any rpm packages successfully without their dependencies packages didn’t get install so you have to install their dependencies and then install your selected packages then yum server helps us here to install our packages in less time and fast by managing our own yum repository by creating yum repository in Linux we can install any packages any time easily.
File transfer protocol:-data can be transferred over a network or the web by ftp and sftp
FTP:-file transfer protocol is TCP/IP application protocol and it uses port number 21 to establish connection and port no-21 to data transmission ftp is the protocol for exchanging files over the
Internet in an unsecured manner. 
SFTP:-is secure file transfer protocol which is used for data transmission over the internet in a secure way SFTP is more popular because it’s supported by Linux and UNIX servers by default.
FTP Client:-when ftp process requesting for file and other process is called ftp client.
FTP Server:-when ftp process receiving the request is called ftp server.

SSH :-is stands for Secure Socket Shell, is a UNIX-based command interface and protocol used for secured remote access to computers and networks. It is widely used by network administrators to control Web and other kinds of servers remotely. SSH commands are encrypted and secure in several ways. Both ends of the client/server connection are authenticated using a digital certificate, and passwords are protected by being encrypted. The SSH, SCP, and SFTP command line tools which are part of the SSH package, are secure versions of the earlier UNIX utilities.

TELNET :-is a protocol that allows you to connect to remote computers (called hosts) over a TCP/IP network (such as the Internet). Using telnetclient software on your computer, you can make a connection to a telnet server.

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