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4.  Think and answer.

                    a.  What is a network?
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                    b.  What is a gateway?

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                    c.  What are the various components of a communication system?

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                    d.  Why do we need computer networks?

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                    e.  Define topology. Explain any two types of topologies.

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                    f.  What do you mean by protocol? Explain FTP and HTTPS.

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                 5.  Differentiate between the following:


                    a.  SMTP                                         POP3
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                    b.  LAN                                          MAN
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                    c.  Client-Server Network                        Peer-to-Peer Network
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