TAILIEUCHUNG - The Case for Virtual Local Area Networks (VLANs)

In the history of Ethernet, the virtual LAN is a recent addition. The VLAN was introduced to solve a number of networking issues. In this whitepaper you will learn about the evolution of Ethernet, the reasons VLANs were introduced, and the ways that VLANs can be used. You will also learn about the networking standards that address the VLAN implementation. | Global Knowledge Expert Reference Series ofWhite Papers The Case for Virtual Local Area Networks VLANs 1-800-COURSES The Case for Virtual Local Area Networks VLANs Ted Rohling Global Knowledge Instructor CISSP Introduction In the history of Ethernet the virtual LAN is a recent addition. The VLAN was introduced to solve a number of networking issues. In this whitepaper you will learn about the evolution of Ethernet the reasons VLANs were introduced and the ways that VLANs can be used. You will also learn about the networking standards that address the VLAN implementation. Ethernet Figure 1. Coaxial Cable-Based Ethernet As a local area networking protocol early Ethernet was inexpensive to install and operate when compared to competing protocols such as Token Ring and Arcnet. It operated as a simple bus architecture using an access method known as Carrier Sense Multiple Access with Collision Detection or CSAM simple contention protocol CSMA CD required that stations listen for transmissions on the coaxial cable based network and only transmit if no other transmissions were heard. If two or more devices transmitted at the same time a collision occurred and the devices were required to transmit again. Ethernet worked well with a few networked devices but as networks grew CSMA CD turned out to be a protocol with a problem. Too much traffic caused too many retransmissions and the efficiency of the network declined. To simplify the installation of Ethernet networks a change was made to the network topology. Networks were converted from coaxial cable to twisted pair cabling by introducing a new device into the network. That device is called a hub. The purpose of the hub was to repeat signals transmitted to it so that all devices attached to the hub reacted as if they were still attached to coaxial cable. The hub did nothing to remove the problems associated with CSMA CD. If anything because it was easy to interconnect hubs or add additional .

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