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Configure interVLAN routing

Each VLAN is its own subnet and broadcast domain, which means that frames broadcasted onto the network are switched only between the ports within the same VLAN. For interVLAN communication, an OSI layer 3 device (usually a router) is needed. This layer 3 device needs to have an IP address in each VLAN and have a connected route to each of those subnets. The hosts in each subnet can then be configured to use the router’s IP addresses as their default gateway.

Three options are available for routing between VLANs:

1. Use a router, with one router LAN interface connected to the switch for each VLAN. Since you need one Ethernet interface on your router to connect to each VLAN, this option is not really scalable and rarely used today.

interVLAN routing with a router

2. Use one router interface with trunking enabled. This option is called router on a stick (ROAS) and enables all VLANs to communicate over a single interface.

interVLAN routing with router on a stick

3. Use a Layer 3 switch, which is a device that performs both the switching and routing operations.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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