Eth Framing VLAN Technology

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Eth Framing VLAN Technology
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  3FL00250_A Ed 031©2008 Alcatel-Lucent., All rights reserved  Alcatel-Lucent University Antwerp 1 University   Ethernet framing & VLAN technology Alcatel-Lucent University Antwerp University During class please switch off  your mobile, pager or other that may interrupt.Entry level requirements:  3FL00250_A Ed 032©2008 Alcatel-Lucent., All rights reserved  2 Table of contents    Ethernet framing......   p. 3  Virtual Local Area Networks. ..   p.13  3FL00250_A Ed 033©2008 Alcatel-Lucent., All rights reserved  Alcatel-Lucent University Antwerp 3 University Ethernet framing  3FL00250_A Ed 034©2008 Alcatel-Lucent., All rights reserved  4 Ethernet-,Ethernet and Ethernet  IEEE-802.3 protocol: based on Xerox Network Standard (XNS)  IEEE-802.3 protocol: commonly called Ethernet. 3 different versions exist:  IEEE 802.3 frame with Type field and any protocol in payload  IEEE 802.3 frame with Length field and LLC header  IEEE 802.3 frame with Length field and LLC/SNAP header  Ethernet v2 is a valid IEEE 802.3 frame.  used in Local Area Networks  uses CSMA/CD LAN >When somebody says that they are running Ethernet on their network, inevitably you have to ask: Which Ethernet? . Currently, there are many versions of the Ethernet Frame Format in the commercial marketplace, all subtly different and not necessarilycompatible with each other.>The explanation for the many types of Ethernet Frame Formats currently on the marketplace lies in Ethernet's history. >In 1972, work on the srcinal version of Ethernet, Ethernet Version 1, began at the Xerox Palo  Alto Research Center. Version 1 Ethernet as released in 1980 by a consortium of companies comprising DEC, Intel, and Xerox. In the same year, the IEEE meetings on Ethernet began. In 1982, the DIX (DEC/Intel/Xerox) consortium released Version II Ethernet and since then it has almost completely replaced Version I in the marketplace. In 1983 Novell NetWare '86 was released, with a proprietary frame format based on a preliminary release of the 802.3 spec. Two years later, when the final version of the 802.3 spec was released, it had been modified to include the 802.2 LLC Header, making NetWare's proprietary format incompatible. Finally, the 802.3 SNAP format was created to address backwards compatibility issues between Version 2 and 802.3 Ethernet.>As you can see, the large number of players in the Ethernet world has created a number of different choices. The bottom line is this: either a particular driver supports a particular frame format, or it doesn't. Typically, Novell stations can support any of the frame formats, while TCP/IP stations will support only one although there are no hardand fast rules in Networking.>CSMA/CD: Carrier Sense Multiple Access with Collision Detection
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