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    WIDE AREA NETWORK (WAN)

                      WAN covers a wide geographical  area. In  other words,  it  is a group of computers  that  are
                      separated by a large distance and tied together. It links different metropolitans and even countries
                      across national boundaries. The most popular example of WAN is the Internet: a collection of vast
                      number of computers spread across the world.

                            LAN                      LAN                                 LAN                       LAN

                                                          LAN                        LAN

                                NETWORK ARCHITECTURE

                      The network architecture defines the overall design of the computer network. There are two types
                      of network architectures.

                      CLIENT-SERVER NETWORK

                      This is the most efficient  network architecture
                      that consists of two parts: client system and
                      server system. One computer is designated

                      as the server and all the other computers                Clients     Internet
                      connected into the network are called the
                                                                                                                    Server
                      clients. The clients can request services from
                      the server. This is called the client-server
                      network. The client does not share any of its resources but requests content or services from
                      the server.

                                                        PEER-TO-PEER NETWORK
                                                          An alternative  to  the client-server approach  is the peer-to-
                                                        peer approach. There are no dedicated servers. All computers
                                                        are equal and can share their resources to be used by others
                                                        and are therefore known as peers. This network is more cost

                                                        effective and required low maintenance and  works well in a
                                                        small environment.

                       14   Premium Edition-VIII

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