What is VLAN?
Turkish: VLAN (Sanal Yerel Alan Ağı)
A VLAN separates devices into logical network groups on shared hardware, isolating traffic and tightening access control.
What is VLAN?
A VLAN (Virtual Local Area Network) divides devices that share the same switching infrastructure into separate logical networks. Accounting computers, guest Wi-Fi, camera systems, and production devices can use the same cabling while remaining isolated from one another.
VLAN traffic is usually carried with 802.1Q tags. An access port connects an endpoint to a single VLAN, while a trunk port carries multiple VLANs between switches, routers, or firewalls. When two VLANs need to communicate, inter-VLAN routing is required, and many organizations route that traffic through firewall policy.
Business Use
VLANs are used in small offices, warehouses, factories, and enterprise campuses to separate security and operations concerns. For example, POS terminals, employee laptops, and a guest network may share one internet connection, but only approved systems should reach the payment network. This separation limits fault spread and narrows audit scope.
A VLAN is not a complete security model by itself. It should be paired with a clear subnet plan, DHCP configuration, routing policy, and network segmentation rules. Misconfigured trunks or reliance on a default VLAN can create unexpected access paths.
Related Terms
A firewall filters traffic between devices and networks using rules, allowing approved connections while blocking suspicious or unauthorized access.
Network SegmentationNetwork segmentation separates users, servers, and systems into controlled network zones to limit unauthorized access and attack spread.
SubnetA subnet divides an IP address range into smaller network sections for routing, security boundaries, and address management.