Course 5: VLANs & TRUNKS

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What you will do

Understand the purpose of creating Virtual Local Area Networks on a switch.
Learn about access ports and trunk ports and how they are configured on a Cisco switch.
Visualize ethernet frame flow in the presence of VLANs / Trunks on a switch.
Perform hands-on configuration and troubleshooting of VLAN / Trunking scenarios on Cisco Switches.
Understand Inter-VLAN Routing.
Investigate Router-on-a-stick configuration.

What you will need

An understanding of unicast and broadcast traffic and how they are handled by a switch.
Knowledge of the Address Resolution Protocol and ICMP.

After taking this course you will

be proficient in configuring VLANs and Trunks on Cisco Switches;
be adept at troubleshooting VLANs and Trunking configuration errors on Cisco switches.

Comments & Discussion

Jared•6 months ago

2.2 kept going on and on never completing. I did like 12+ exercises haha. It told me 3 at the start.

Connected Dots Online•6 months ago

Thanks for bringing this up. I probably need to make this a bit clearer. As soon as you see the "CLOSE" button appear in any lesson, it means that the lesson is complete. (For 2.2 you'll still get the option to continue with more questions for as long as you'd like, but as soon as you see the "CLOSE" button appear after finishing a question, it means that the lesson is complete.

Jared•6 months ago

Feedback: There is a typo in 3rd step of 2.1 where it states
Each device has been configured with an _____ from the network 10.103.155.0. At this point, every computer is able to ping every other computer.
I believe we are missing IP Address or something relatable

Connected Dots Online•6 months ago

Hi Jared,
Thanks for letting me know. You're right, it's missing the words "IP Address". The change will be updated shortly.

Hiwot•1 year ago

please I do not have money to purchase

Hiwot•1 year ago

I want to attend the course please how could you help?

Andrii•2 years ago

Hi

5.VLANS&TRUNKS --> A deeper look at trunk interfaces
"Check the section where VLANs are defined on this switch? VLANs 101, 102 and 103 are defined on the switch, but VLAN 200 is not."

However, if you had created VLAN 200 right before this question, it is already reflected and automatically highlighted in the switch terminal window.

Connected Dots Online•2 years ago

Thanks for pointing this out, Andrii! The lesson has been modified to not allow you to create VLAN 200 on the switch until instructed to do so :).
(Since the intent of that portion is to demonstrate what happens if a VLAN is allowed on a trunk link without having been created on the switch.)

Dmitry•4 years ago

Section 4.3 (Router-on-a-stick), Activity Break 6
The hint for configuring RTR 1 reads as follows:

int gi0/0.10 [Hide]
encapsulation dot1Q 10 native
ip address 10.3.1.1 255.255.255.0

Shouldn't it be 10.3.0.1? My understanding is that 10.3.1.1 belongs to VLAN 20.

Thanks!

Connected Dots Online•4 years ago

Thanks so much for pointing that out Dmitry! It has been corrected now.

Dmitry•4 years ago

Lesson 4.4 (Switched Virtual Interfaces - Part 1): didn't work for me. I couldn't create a virtual interface on the switch. After a few attempts, I clicked on "Perform this for me". This time, the interfaces were created successfully, and the appropriate IP addresses were assigned, but when I tried to ping computers on different VLANs, the pings failed. I'm using Safari 10.1.2 on MacOS 10.10.5.

Connected Dots Online•4 years ago

Hi Dmitry,
Thank you very much for reporting this. A recent update to Layer 3 features introduced a bug. This has now been corrected. Thanks again for reporting it!

Connected Dots Online•4 years ago

Hi Dmitry, also, please note that on Safari, auto-correct is enabled by default. ("vlan" gets auto-corrected to "van"). Were you getting an "Invalid input detected at '^' marker" error?

Connected Dots Online•4 years ago

2 new lessons on Switched Virtual Interfaces have been added to this course recently. As always, please report any errors or inconsistencies.
Any kind of feedback is always welcome! :)

Anil•5 years ago

The course covers minor details usually not found elsewhere. It's very interactive. You guys have put utmost effort for the development of this course. Thanks for providing it free. Are there any plans for new topics in new future ?