Date Added: May 2011
The efficient managing system of sources is mandatory for the successful running of any network. Here this paper describes the most popular network architectures one of developed by IBM, System Network Architecture (SNA) and other is Digital Network Architecture (DNA). As the authors know that the network standards and protocols are needed for the network developers as well as users. Some standards are The IEEE 802.3 standards (The Institute of Electrical and Electronics Engineers 1980) (LAN), IBM Standards SAN (LAN), CCITT Standards (Comit? Consultatif International T?l?phonique et T?l?graphique) (WAN) is the former, but still widely used, name for the ITU (International Telecommunications Union1865), it became a United Nations agency in 1947, a Geneva-based organization that sets international communications standards.