Switch connected to VLAN

A switch port is connected to a VLAN by assigning it to a specific VLAN as an access port or configuring it as a trunk port to carry multiple VLANs.VLAN BasicsA Virtual Local Area Network (VLAN) logically segments a network into separate broadcast domains, even if devices are physically connected to the same switch. VLANs improve security, reduce unnecessary broadcast traffic, and allow network administrators to group devices by function, department, or application rather than physical location .Access Ports vs Trunk PortsAccess Port: A switch port assigned to a single VLAN. Devices connected to this port belong to that VLAN and can communicate only with other devices in the same VLAN. For example, a port assigned to VLAN10 will only carry traffic for VLAN10 .Trunk Port: A switch port configured to carry traffic for multiple VLANs between switches or to routers. Trunk ports use VLAN tagging (802.1Q) to identify which VLAN each frame belongs to. This allows VLANs to span multiple switches .Configuring a Switch Port to a VLANCreate the VLAN on the switch:CodeCopySwitch(config)# vlan 10Switch(config-vlan)# name Admin Assign a port to the VLAN (access mode):CodeCopySwitch(config)# interface gigabitEthernet 0/1Switch(config-if)# switchport mode accessSwitch(config-if)# switchport access vlan 10 Configure a trunk port to carry multiple VLANs:CodeCopySwitch(config)# interface gigabitEthernet 0/24Switch(config-if)# switchport mode trunkSwitch(config-if)# switchport trunk allowed vlan 10,20,30 Inter-VLAN CommunicationDevices in different VLANs cannot communicate directly. To enable communication, inter-VLAN routing is required, often implemented using a router or Layer 3 switch. A common method is Router-on-a-Stick, where a single router interface is divided into sub-interfaces, each assigned to a VLAN with its own IP address. The switch port connecting to the router must be a trunk port to carry all VLAN traffic .SummaryConnecting a switch to a VLAN involves:Creating VLANs on the switch.Assigning ports as access ports for single VLAN membership.Configuring trunk ports to carry multiple VLANs between switches or to routers.Using inter-VLAN routing for communication between VLANs. This setup ensures network segmentation, security, and efficient traffic management across your LAN .