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Course 5: VLANs & TRUNKS   

PRICE: $0.00

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
Connected Dots Online2 months ago
Some updates were made earlier today. If you encounter any errors or problems with any of the lessons or exercises, please post a note here.
christian6 months ago
you stated that it doesn't exist using the show vlan commend yet using the same command I can see the vlan 400 and it is assigned on int gi0/6.
Connected Dots Online6 months ago
Hi Christian, could you clarify which lesson this is in reference to?
christian6 months ago
in section 3.2 we you stated that when a layer 2 interface is configured as a trunk port then only vlans on the switch will be displayed on the running config of that switch . There is vlan 400 that exists on the running config which you stated doesn't exist please elaborate your point on that thanks for your feedback.
christian6 months ago
hi connected dots please clarify for me the point where you have stated that when a layer 2 interface is configured as a trunk port then only vlans on the switch will be displayed on the running config of that switch I was practicing section 3.2 and you have stated that vlan 400 does not exist on the switch yet we created it and assigned it to int gi0/6 please help me understand your point.
Dmitry8 months 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

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

Connected Dots Online8 months ago
Thanks so much for pointing that out Dmitry! It has been corrected now.
Dmitry10 months 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 Online10 months 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 Online10 months 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 Online13 months 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! :)
Anil15 months 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 ?
Connected Dots Online15 months ago
Thanks for the feedback, Anil! You're welcome. (Yes, the little details sometimes make a big difference while troubleshooting complex networks.)
Yes, there are plans to develop more topics.
Connected Dots Online19 months ago
Cisco's Dynamic Trunking Protocol is covered in a new post uploaded to the Resources section of the site:
Sherzod19 months ago
It's great! Thank you very much. Looking forward to the next lesson.
Yannick20 months ago
Thanks I just completed the course and it was fantastic.So when will you upload the next courses
Connected Dots Online20 months ago
Thanks for the feedback Yannick! A new lesson has just been uploaded for this course (Router on a stick). The next course should be available in a couple of weeks.
Luisito22 months ago
It's great, I've learn a lot about this course, i'm waiting for nex lesson
Connected Dots Online22 months ago
Thanks Luisito! The next lesson should be uploaded in a few days!
Dmitry23 months ago
Awesome! Loved the way the course is structured, the balance between theory and practice (labs, exercises, activity breaks), interactive features, the visualization tool! Looking forward to the next lesson.
Connected Dots Online23 months ago
Thank you for your constructive and informative feedback, Dmitry! Glad to hear that you found the structure effective. We're hoping to be able to keep increasing the effectiveness of the content we offer!
Sherzod23 months ago
This course is great. Thanks. We look forward to the next lesson!
Connected Dots Online23 months ago
Thank you for the feedback, Sherzod! We should be uploading the next lesson later today.
Connected Dots Online24 months ago
This course is still in development but we have made it available while we continue the development. We hope to make new lessons available every few days.
As usual, any feedback is greatly appreciated!