.
.
( LAN, Local Area Network) . , , , .
, :
MAN Metropolitan Area Network. . .
WAN Wide Area Network. , .
GAN , ( Global Area Network).
. , , . , , (, CSNET), , NSFNET, .
, , , , , . ().
, , , , , .
, .
, . , , .
, .
.
, .
, .
, , , .. .
:
(Data Sharing). . ;
(Resource Sharing). ( ) . , , ;
(Software Sharing). , . , ;
(Electronic Mail). , .