VLAN

Virtual LANs and Layer 2 switching, the foundation of every campus network. Articles tagged VLAN cover fundamentals, trunking, inter-VLAN routing, EtherChannel, troubleshooting, and campus design on Cisco Catalyst switches.

29 posts

VLAN

VLAN Access Ports and Switchport Modes: Access, Trunk, and Dynamic

Learn the differences between access mode, trunk mode, and dynamic trunking protocol negotiation on Cisco Catalyst switches, and why static configuration is the production standard.

Apr 1, 2026 7 min read

VLAN

How VLANs Work: Tagging, Broadcast Domains, and Frame Forwarding

VLANs are more than a configuration checkbox — they change how every frame is tagged, forwarded, and filtered inside the switch. Here's the mechanics.

Apr 1, 2026 7 min read

VLAN

What Is a VLAN? Virtual LANs Explained for Network Engineers

VLANs let you carve one physical switch into multiple isolated broadcast domains — without buying more hardware. Here's how they work and why every network uses them.

Apr 1, 2026 6 min read

VLAN

Understanding Ethernet LAN Fundamentals for CCNA

Master Ethernet LAN fundamentals for your CCNA exam. Learn how IEEE 802.3 defines Layer 1 and Layer 2 operations, Ethernet frames, MAC addressing, and LAN topology for modern switched networks.

Oct 26, 2025 5 min read

EtherChannel LACP uplink between Cisco switches using multiple Ethernet cables

VLAN

Configuring EtherChannel with LACP on Cisco Catalyst Switches

LACP bundles multiple physical links into one logical pipe—doubling or quadrupling bandwidth while keeping STP happy and providing automatic failover.

Oct 22, 2025 6 min read

VLAN

Configuring 802.1Q Trunks on Cisco Catalyst Switches

Master 802.1Q trunk configuration between Catalyst switches, including VLAN pruning, native VLAN setup, and comprehensive troubleshooting techniques.

Oct 14, 2025 8 min read