• The SFTP first authenticates that client and the server by establishing a single secure connection through the firewall.
  • After building a secure connection between the client and the host comuter, the SFTP protocol encrypts all the data in binary from before sending it over the network.
  • The SFTP not only encrypts data but it also encrypts commands thus, providing data protection against common security threats.

    • SMTP (SIMPLE MAIL TRANSFER PROTOCOL)

    Simple Mall Transfer Protocol (SMPT) is the most common protocol used for transferring e-mails between two or more servers. It generally sends the messages from a mail client to a mail server. Apart from transferring e-mails, SMTP also provides notifications regarding the incoming mail. However it cannot transmit pictures, sounds, or movies. It is capable of sending text only. It has limited ability to queue the messages at the receiver's end. Hence, we need some other protocols for e-mail retrieval.

    POP3 (POST OFFICE PROTOCOL VERSION 3)

    POP3 (Post Office Protocol Version 3) is another commonly used e-mail protocol. It helps to retrieve e-mails from a remote web server using a local client. All POP3 mail servers have a unique address provided by the e-mail service provider. To effectively use POP3 protocol with the e-mail client program (like MS outlook) the address of the mail server must be configured correctly, you will also need to input your username and password to successfully receive e-mails from a remote web server.
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    ESMTP (Extended Simple Mall Transfer Protocol) allows multimedia files to be delivered as attachment to an e-mail


    TELNET

    Just like HTTP and ICP/IP, Telnet is a protocol that is used for accessing a remote computer. A network, composed of multiple computers, using a different kind of hardware and operating systems. Connection to these dufferent kinds of computer may require platform. Telnet, with its built in command structure, provides easy access to remote host computers. It allows the user to login on the remote computer system using the correct login and sign in credemtials. The Telnet program gives you a charchter-based terminal wimdow on another system. The steps to connect to Telnet using using Windows 7 are:

    Figure 2.9: control panel

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