How can VLAN segmentation improve security and traffic isolation in a multi-department corporate network?

Example Concept: VLAN segmentation involves creating distinct broadcast domains within a switch or across multiple switches, using VLAN IDs to tag traffic. This separation ensures that devices on different VLANs cannot directly communicate unless explicitly allowed through routing or firewall rules. By isolating traffic, VLANs prevent unauthorized access between departments, reduce the risk of broadcast storms, and simplify the application of security policies tailored to each department's needs.