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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Routing between VLANs

Hosts in a VLAN live in their own broadcast domain and can communicate freely. VLANs create network partitioning and traffic separation at layer 2 of the OSI, and as I said when I told you why we still need routers, if you want hosts or any other IP-addressable device to communicate between VLANs, you just have to have a layer 3 device to provide routing—period.

For this, you can use a router that has an interface for each VLAN or a router that supports ISL or 802.1Q routing. The least expensive router that supports ISL or 802.1Q routing is the 2600 series router. (You’d have to buy that from a used-equipment reseller, because they are end of life, or EOL.) The 1600, 1700, and 2500 series don’t support ISL or 802.1Q routing. ...

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