Wide Area Network(WAN)

WAN Wide Area Network:
                                          When we want to connect one LAN local area network to another LAN ,it is connect through WAN wide area network."Connectivity to some one LAN is called WAN wide area network".Accessing another LAN is WAN for us.For example ,if we want to access yahoo server from our Local area network LAN,actually we connect to anther LAN ,so accessing yahoo LAN is WAN for us.In the same way,if we want to access Google LAN or Hotmail LAN,these LAN are also WAN for us.
Connectivity procedures in WAN:
                                                     We can connect through WAN through two methods
1) Point to point
2) Point to multipoint

1) Point to Point Connectivity:
                                                            When we want to connect two branches through WAN, this is called point to pint connection.For example,We connect two branches of National bank of Pakistan.
 Technologies use in point to point connections are PPP and HDLC

 2) Point to Multipoint Connectivity:  
                                                                       When we want to connect many branches to single branch through WAN,this is called point to multipoint connectivity.For example,We connect many branches of National bank of Pakistan to main branch of National bank of pakistan.
Different technologies are use in it such as ISDN , frame relay, ATM , X.25, MPLS