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Lecture -9 Client Server Concepts DNS,Telnet,Ftp – jj

Lecture -9 Client Server Concepts DNS,Telnet,Ftp

Lecture Series on Internet Technologies by Prof.I.Sengupta, Department of Computer Science & Engineering ,IIT Kharagpur. For more details on NPTEL visit …


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  1. The presentation is very informative & well explained. I guess by mistake port 22 was used for ftp data port. Port 22 is used for SSH, the data port should be 20 (rfc959). Even in ftp over ssh we use port 21 for data connection.
    Port 20 is generally used in Active FTP, where server intiate data transfer fusing source port 20.

  2. you don't understand because you don't understand english well. what is the meaning of "dawn"?

    definittion of dawn

    dawn (dôn)
    1. The time each morning at which daylight first begins.
    2. A first appearance; a beginning: the dawn of history. See Synonyms at beginning.
    intr.v. dawned, dawn·ing, dawns
    1. To begin to become light in the morning.
    2. To begin to appear or develop; emerge.
    3. To begin to be perceived or understood: Realization of the danger soon dawned on us.

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