LAN Interconnection and Internetworking

The realm of LAN interconnection devices offers a number of options. This section discusses the nature of hubs, LAN switches, virtual LANs (VLANs), bridges, routers, and IP switches.


Hubs interconnect the wiring that's connected to workstations. They are a building block of most networks. There are three major types of hubs:

  • Active— Active hubs regenerate and retransmit signals, just as a repeater does. Because hubs typically have 8 to 12 ports for network computers to connect to, they are sometimes called multiport repeaters. Active hubs require electrical power to run (that's why they're called active).

  • Passive— Passive hubs serve as connection points and do not regenerate the signal; the signal simply ...

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