From the course: Cisco CCNA (200-301) Cert Prep: 1 Network Fundamentals and Access

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VLANs

VLANs

From the course: Cisco CCNA (200-301) Cert Prep: 1 Network Fundamentals and Access

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VLANs

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[Instructor] By default, a switch has all of its ports in a single broadcast domain. This means if a broadcast is sent, it will go out to all ports save for the one it entered on. Following that logic, to create separate broadcast domains, an engineer would have to use a different switch for each domain, which isn't practical or scalable in any real way. This is where Virtual LANs or VLANs come in. VLANs allow logical segmentation within a single switch. A VLAN allows for multiple separate broadcast domains to exist in the same switched infrastructure. VLANs have many benefits. They reduce the number of devices that needlessly receive broadcasts. They increase security by segregating networks, and they also shrink the failure domain so troubleshooting issues can be simpler. Manage switches, or those that allow VLAN configuration, generally default to having all ports configured for the default VLAN. In Cisco Kit this will be VLAN 1. As a best practice, all ports should be moved to a…

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