Remote logging is a client-server program that allows user to login to a remote computer. After logging on, a user can use the services available on the remote computer and transfer the results back to the local computer.
Terminal Network abbreviated as TELNET is a remote logging application. TELNET is a general-purpose client/server application program which enables the establishment of connection to remote system in such a way that the local terminal appears to be a terminal at the remote system. It is the standard TCP/IP protocol for virtual terminal service as proposed by the International Organization for Standards (ISO).
TELNET uses one TCP connection at port 23. Telnet operates in one of the three modes: default mode, character mode and line mode. It has command line interface.
E-mail is one of the most popular and widely used services on the internet. E-mail is the service that allows you to send and receive messages on the internet. It can send and receive file attachments, videos, images etc. There are many popular E-mail service available free of cost like gmail, yahoomail, Hotmail etc.
Architecture of E-mail system
Generally an email system consists of three mail components:
Transferring files from one computer to another is one of the most common tasks required from a networking or internetworking environment. The largest volume of data exchange in the Internet today is due to file transfer. We will discuss a very popular involved in file transfer i.e. File Transfer Protocol (FTP).
File Transfer Protocol (FTP) is the standard mechanism provided by TCP/IP for copying a file from one computer/host to another. It establishes two TCP connections between the hosts. One connection is used for data transfer, the other for control information (commands and responses). The well-known port 21 is used for the control connection and the well-known port 20 for the data connection. The control connection remains connected during the entire interactive FTP session. The data connection is opened and then closed for each file transferred. It opens each time commands that involve transferring files are used, and it closes when the file is transferred.
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