Hi Hitesh Aggarwal,
Welcome to Microsoft Community Forums.
Here is the difference between CAN (campus area network) and Lan (Local Area Network).
Campus Area Network: This applies to multiple small LANs that are connected across multiple buildings within a small area. It’s common to see CANs used to link up multiple buildings of a large company’s head office, a military base, or even a college campus.
Local Area Network: This is the simplest and most common type of network. Most LANS exist within a very small geographic area, or even within the same building. The wireless network in your home can be said to be a type of LAN.
Hope it helps.
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