LAN (local area network), hay còn gọi là "mạng cục bộ", là mạng tư nhân trong một toà nhà, một khu vực (trường học hay cơ quan chẳng hạn) có cỡ chừng vài km.
LAN (local area network), also known as the "local area network", is the private network in a building, an area (school or such agencies) have the size as long as several kilometers.
LAN (local area network), also known as the "local network", the private network in a building, a sector (schools or agencies, for example) is about the size of a few kilometers.