https://blog.it-learn.io/tags/vlan/Recent content in Vlan on it-learn.io | IT, Networking & Cybersecurity BlogHugoen-usWed, 29 Apr 2026 00:00:00 +0000https://blog.it-learn.io/posts/2026-04-29-vlan-hopping-jumping-between-network-segments/Wed, 29 Apr 2026 00:00:00 +0000https://blog.it-learn.io/posts/2026-04-29-vlan-hopping-jumping-between-network-segments/<p>Network segmentation is one of the most fundamental security controls in enterprise architecture. VLANs are how that segmentation is typically implemented at Layer 2 — separating the finance workstations from the engineering lab, the production servers from the guest wireless, the PCI cardholder data environment from the rest of the network.</p> <p>The problem is that VLANs are enforced by switch configuration, and switches — particularly legacy ones with default settings that prioritize compatibility over security — can be tricked into treating an attacker&rsquo;s port as a trunk, delivering traffic from every VLAN on the wire. Or a single double-encapsulated frame can jump a VLAN boundary in one hop with no negotiation required.</p>