![]() ![]() ![]() With their ability to isolate traffic and create the "instant" networks, switches can be used to divide a physical network into multiple logical or VLANs through the use of Layer 2 traffic segmentation. If the destination address of a frame is not known or if the frame received by the switch is destined for a broadcast address, the switch forwards the frame out all ports. These lookup tables are populated by an address-learning process on the switch. ![]() Switches maintain content-addressable memory (CAM) lookup tables to track the source addresses located on the switch ports. Data frames are sent by end systems, and their source and destination addresses are not changed throughout the switched domain. Unlike hubs, switches cannot regulate the flow of data between their ports by creating almost "instant" networks that contain only the two end devices communicating with each other. This chapter covers the following subjects: ![]()
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