MAN(metropolitan area netework)-
                                                  it is a N/w which is located with a signal geagraphical region area 
man usually do not use private dedicated
CAN(campus area network)-
                                        it is located in a collage campus or two or more building having a same office in a limited area
SAN(storage area network)-
                                         A storage
 area network (SAN) is a dedicated network 

that provides access to consolidated, block 

level data storage. SANs are primarily used to

 enhance storage devices, such as disk

 arrays, tape libraries, and optical jukeboxes, 

accessible to servers so that the devices

 appear like locally attached `devices to

 the operating system.

PAN (personal area network)-A personal

area network (PAN) is a computer

network used for data transmission 

among devices such 

. PANs can be used for communication 

among the personal devices themselves

 (intrapersonal communication), or for 

connecting to a higher level network and 

the Internet