Chapter 7. Breaking the VLAN barrier by using switched virtual interfaces

Although splitting devices into separate virtual LANs (VLANs) prevents excessive flooding and provides a bit of security, it creates another problem: devices in separate VLANs can’t communicate with each other—at least not without a little help.

At the end of the last chapter, I recommended connecting two test computers to the two VLAN access ports you configured. If you weren’t able to do that, don’t worry. You can still follow along with most of the exercises, and I’ll provide screenshots to fill in the gaps, using the computers shown in figure 7.1 as an example.

Figure 7.1. Two computers in separate VLANs

As you can see, HR-PC1 is connected to FastEthernet0/20, which ...

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