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 VLANaware 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 switchtoswitch control traffic (for example, CDP or LLDP). Another is the native VLAN, which enables nonVLAN 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/labsandq...
Quiz: link: https://networkdirection.net/labsandq...

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


CCENT/CCNA ICND1 100105 Official Cert Guide (affiliate):
https://click.linksynergy.com/link?id...

In the next video, we’re investigating using a router to provide security using accesslists


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)


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