VLAN Settings Review

A set of vocabulary flashcards covering VLAN basics, inter-VLAN routing, subnets, default VLANs, gateways, and common mistakes as described in the video notes.

VLAN

A Virtual Local Area Network that logically segments a network into separate broadcast domains; devices in different VLANs cannot communicate without routing.

Inter-VLAN Routing

The process of routing traffic between different using a router or Layer 3 device.

Subnet

A logical subdivision of an IP network; devices in the same VLAN should share the same subnet

Default VLAN (VLAN 1)

The default VLAN where untagged ports belong by default; if many devices are on VLAN 1, it creates a large broadcast domain.

Gateway

The device/interface that provides traffic routing for hosts to reach other VLANs and the Internet; without a gateway, hosts cannot reach other networks.

Router

A device that routes traffic between VLANs and to the Internet

Untagged Port

A switch port that sends/receives frames without a VLAN tag; by default, untagged ports belong to the configured untagged VLAN (often VLAN 1 if not changed).

Server VLAN

A separate VLAN for servers to segregate server traffic from client VLANs, improving performance by reducing cross-VLAN broadcasts.

Broadcast Domain

The set of devices that receive broadcast frames; VLANs reduce the size of broadcast domains by isolating traffic.

Common VLAN Issue: Lack of Routing

A frequent cause of communication problems is failing to route traffic between VLANs; proper inter-VLAN routing is essential for communication.

Unconnected VLANs to Internet

Without routing and a gateway for each VLAN, IT and HR clients cannot reach the Internet; routing between switches and the Internet is required.