communication software

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E-mail is short for Electronic Mail, a software application based on communications to transmit messages over the Internet as a communication network. The E-mail becomes the most popular and frequently used application because of the reasons of easily message transmission to the receiver even though the distance location of the sender and receiver within a thousand miles.

Most of e-mail systems consist of an elementary text editor for composing messages, but many allow users to edit the messages using any editor they want. The message can be sent to the recipient by specifying the recipient's address. Most of message was sent in a text and image form, but some audio files also can be sent but with limited of file size. This application also is able to send the same message to several users at once. This is called broadcasting.

The e-mail application using the standard protocol for sending emails namely Simple Mail Transfer Protocol (SMTP). While, the most commonly used protocol for e-mail receiving is Post Office Protocol v3 (POP3) and Internet Message Access Protocol (IMAP). The receiving protocol is used by email client to extract email message from domain’s email server. Figure 5 below shows the e-mail processing diagram using specified protocol.

Even the message is not send in a real time platform and it is a delay-tolerant application, it still preferred application because this is the only means of sending a letter in the cheapest way, fast, flexible and reliable. Other the advantages of email is the ability to store the email messages in electronic mailboxes until the recipient fetches them and have a notification to the recipient when new mail is received. The e-mail technology is growing rapidly with the advent of m...

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...8 below show the comparison of this two type of FTP.

Figure 8. The Comparison between Active FTP and Passive FTP

There also enhancement in FTP technology which are Trivial Fail Transfer Protocol (TFTP) and Secure File Transfer Protocol (SFTP/FTPS). The TFTP are designed for User Datagram Protocol (UDP) with minimal overheads. Each message is an independent UDP datagram. It always used to bootstrap workstation and network devices. There are two types of transfer mode being use in TFTP namely Netascii for text files transferring and Octet for binary files transferring. While SFTP/FTPS allows clients to request the FTP session being encrypted using cryptographic tools such as Transport Layer Security (TSL) or Secure Sockets Layer (SSL) so that commands and data contains passwords and sensitive information is prevented from being transmitted openly over the network.

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