Uploaded March 2026 | Updated September 2026, 1 week ago

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CBT Nuggets trainer Keith Barker breaks down VLAN trunking and 802.1Q tagging using a simple building analogy to show how VLANs extend across multiple switches. You’ll see how trunk ports add VLAN tags, how the native VLAN handles untagged traffic, and why these concepts matter when you’re scaling a Layer 2 network. Keith also looks at the problem of loops between switches, how Spanning Tree prevents broadcast storms, and how link aggregation (LAG) lets you use multiple links at once for more bandwidth and redundancy.

🔎 Read more in our blog _What is 802.1Q Port Tagging_ for more info: blog.cbt.gg/914u
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