An access port is a type of switch port used to connect end devices such as PCs, printers, or servers to a network. It operates at Layer 2 of the OSI model, handling data link layer functions, and is assigned to a single VLAN, ensuring that all traffic from the connected device stays within that VLAN . Unlike trunk ports, access ports do not carry traffic for multiple VLANs and do not use VLAN tagging .
When an end device sends data to the network, the access port forwards the untagged frames to the switch. The switch internally associates the traffic with the VLAN configured for that port, often using a Port VLAN ID (PVID). Before the frame leaves another access port to reach the destination device, the switch strips any VLAN tags, so the endpoint only sees raw, untagged traffic . This simplifies communication for devices that do not support VLAN tagging.
| Feature | Access Port | Trunk Port |
|---|---|---|
| VLANs | Single VLAN | Multiple VLANs |
| Traffic | Untagged | Tagged (IEEE 802.1Q) |
| Purpose | Connects end devices | Connects switches or routers |
| Complexity | Simple | More complex to configure |
| Broadcast Domain | Part of one VLAN | Can carry multiple VLANs across the network |
Access ports are ideal for end-user devices in enterprise networks, providing a secure and straightforward connection to the network while maintaining VLAN segmentation. They are often used in conjunction with port security and 802.1X authentication to prevent unauthorized access . In summary, an access port is essentially the user-facing interface of a switch, designed to connect individual devices to a specific VLAN, ensuring proper traffic isolation and network organization.
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