Classification Networks
The standard IEEE 802.3. According to Gallo & Hancock (2003), the Ethernet Version 2.0 was developed during years 70, same time of its gnese ALOHA, created for Norman Abramson. The basic difference between the Ethernet Version the 2.0 and ALOHA is that the ALOHA, allowed that any knot (active of net) transmitted given at any time, with this, did not prevent the calls collisions. The Ethernet on the other hand, was developed and projected to detect these collisions. At the beginning of the decade of 80, in accordance with Colouris, Dellimore, & Kindberg, (2007), the IEEE instituted a committee to classify a series of standards for the nets, the model IEEE 802. Some standards, if differ in the performance, cost, efficiency and trustworthiness, plus all supply resources interconnection of nets in high speed.
Table 1 Classification of nets in accordance with the model IEEE 802 IEEE NNomeTtuloReferncia 802.3EthernetCSMA/CD Networks (Ethernet) IEEE 1985a 802.4Token Bus Networks IEEE 1985b 802.5Token Bus Networks IEEE 1985b 802.6Metropolitan Networks Area IEEE 1994 802.11Wireless Local Networks Area IEEE 1999 802.15.1Wireless Personal Networks Area IEEE 2002 802.15.4Wireless Sensory Networks IEEE 2003 802.16Wireless Metropolitan Networks Area IEEE 2004a Source: Colouris, Dellimore, & Kindberg, 2007 Interim, exists some differences between the standards of Ethernet of Xerox and the model created by the IEEE. In accordance with Gallo & Hancock (2003), one of the differences between the 2.0 version and IEEE 802,3 are the topology and the type of handle. IEEE 802,3 supplies support to the topology in star and slide bars, but the Ethernet version 2.0 only supplies to support the slide bars. Finally, compatible nets with IEEE 802,3 can be of band base or broad band, but the nets version 2.0 only can have Ethernet of band base. Still on the computer networks, another media exists that does not demand the necessity of the use of handles, that is, the transmission is made by radiofrequncia or communication infra-red ray.
