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Building a WAN

Wide Area Networks (WANs) are used to connect LANs and other types of networks together, so that the users and computers in one location can communicate with the users and computers in other locations. WAN connects multiple LANs (or MANs or CANs or PANs) to create a logical single LAN. 
Features of WAN:
WANs are often built using leased lines. At each end of the leased line there will be a router connected to the LAN of that end, and using the leased line the two LANs at the two ends of the leased line get connected. WAN built on leased lines are generally very expensive.
Instead of using leased lines, WANs can also be built using Internet using the standard facilities available from ISP's e.g. braodband Internet, etc.
Generally an organisation will build a WAN for own useand to communicate with the remote offices. Those WANs are called private WANs. For example, a company with offices in Calcutta, Mumbai and Delhi may connect the respective office LANs by building a private WAN using leased lines.
There are WANs which are public WANs. The Internet is a public WAN.
Planning WAN:
WAN planning initiative is expected to be the responsibility of the IT team of the organisation.
For proper planning certain basic data must be collected, may be in a form of a Questionnaire to specify the details of the WAN.