VLAN 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!
Quiz: link: https://networkdirection.net/labsandq...
Patreon information: https://networkdirection.net/patreon/
CCENT/CCNA ICND1 100-105 Official Cert Guide (affiliate): https://click.linksynergy.com/link?id...
Overview of this video:
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)
In the next video, we’re investigating using a router to provide security using access-lists
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