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Todd Lammle's CCNA/CCENT IOS Commands Survival Guide: Exams 100-101, 200-101, and 200-120 by Todd Lammle

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Chapter 5

Layer-2 Switching and Spanning-Tree Protocol (STP)

When Cisco discusses switching, it’s talking about layer-2 switching unless otherwise mentioned. Layer-2 switching is the process of using the hardware address of devices on a LAN to segment a network. In this chapter I’ll focus on the particulars of layer-2 switching so you can understand how it works.

OK, you know that switching breaks up large collision domains into smaller ones and that a collision domain is a network segment with two or more devices sharing the same bandwidth. A hub network is a typical example of this type of technology. But since each port on a switch is actually its own collision domain, you can make a much better Ethernet LAN network just by replacing your ...

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