![]() The destination address will be either a unicast addresses, a multicast address or a broadcast address. The source address is always a unicast MAC address. It’s important to remember that every Ethernet frame contains two MAC addresses. ![]() The chart below provides a list of the four workstations and their respective MAC addresses. We’ll call these workstations A, B, C and D and we’ll number the ports 1, 2, 3 and 4. Now, imagine that we have a switch with four ports and four user workstations. These functions are present in a switch by default, right out of the box. The switch accomplishes these requirements by executing four basic functions: Learning, Forwarding, Filtering and Flooding. What the network needed was a more logical device that could make decisions for where to send data and block the traffic flow to irrelevant devices. There was no privacy or security and performance was poor. ![]() At its core, the Ethernet is a shared network, each node contending for access to precious bandwidth and dealing with the repercussions of collisions.īefore switches, hubs received Ethernet frames and forwarded them to every connected device. The Ethernet switch has become an integral part of the world’s LAN infrastructure. ![]()
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December 2022
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