VLAN Trunk Links | Network Fundamentals Part 13

Switch Trunk Links | Network Fundamentals Part 13
We’ve seen that VLANs can divide up a switch into separate logical networks. But what happens when we run out of ports? We need to buy a new switch.

But how do we connect the two switches in a VLAN-aware network? Do we need a separate link for each VLAN? That could work, but won’t scale well. What if we have 50 VLANs?

Instead, we can use a trunk link. This uses a process called tagging, where the VLAN ID is added to each frame, in the form of a small tag in the ethernet header.

Now a single link can be used between the switches, and traffic from different VLANs can pass over it, all while still keeping the traffic separate.

There are a few special VLANs which work with this. One of these is VLAN 1, which is used for switch-to-switch control traffic (for example, CDP or LLDP). Another is the native VLAN, which enables non-VLAN aware devices to connect.

Trunking also enables extra features, like Router On A Stick, or ROAS. This is where a router can connect to the network using a single trunk link, and forward traffic between VLANs.

See how all of this works in this video!

Lab: https://networkdirection.net/labsandquizzes/labs/lab-vlan-trunking-and-tagging/
Quiz: link: https://networkdirection.net/labsandquizzes/quizzes/vlan-trunking-and-tagging-quiz/

Patreon information: https://networkdirection.net/patreon/

CCENT/CCNA ICND1 100-105 Official Cert Guide (affiliate):
https://click.linksynergy.com/link?id=RL4E*8CmbSY&offerid=145238.2955226&type=2&murl=http%3A%2F%2Fwww.ciscopress.com%2Ftitle%2F9780135792735

In the next video, we’re investigating using a router to provide security using access-lists

Overview of this video:

0:00 Introduction

0:33 Extending VLANs Across Switches

1:38 How Trunking Works

6:12 Voice VLANs

7:49 Lab (Part 1)

14:14 Quiz #1

14:25 VLAN 1

15:36 Native VLAN

16:30 Lab (Part 2)

21:39 Quiz #2

23:51 ROAS and Lab (Part 3)

LET’S CONNECT

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