The Link Layer and Local Area Networks

1104
Ethernet Technologies
Ethernet Technologies

As discussed earlier, weve referred to Ethernet as if it were a single protocol standard. But in fact, Ethernet comes in many different flavors, with somewhat bewildering acronyms such as 10BASE-T, 10BASE-2, 100BASE-T, 1000BASE-LX, and 10GBASE-T. These and many other

Tags baseband ethernet, ethernet traffic, physical media, repeater, coaxial cable, star topology
764
Link-layer Switches
Link-layer Switches

As illustrated in Figure 1, modern Ethernet LANs use a star topology, with each node connecting to a central switch. Up until this point, we have been unclear about what a switch actually does and how it works. The role of the switch is to receive incoming link-layer frames and

Tags star topology, buffers, switch table, forwarding table
328
Self-Learning
Self-Learning

A switch has the amazing property (particularly for the already-overworked network administrator) that its table is built automatically, dynamically, and autonomously - without any interference from a network administrator or from a configuration protocol. In other words, switches are self-learning. This capability is accomplished as follows:

Tags network administrator, self-learning, switch table
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