DHCP Snooping | Cisco CCNA 200-301

Igor had a question about the layer 2 MAC to DHCP payload MAC verification. (around the 30 minute mark). By default that would not happen unless we also add this command:


ip dhcp snooping verify mac-address


Thanks to Igor for bringing that to my attention. I have it on my list to re-record this video. New version will have improved audio, and shorter duration. Thanks!

Thank you so much for sharing your story at the end of this video. Very inspiring as I just got my CWNA this past week and am going for my CCNA this September. I'm also in the middle of a interview process for a Technical Consulting Engineer which would be a dream job come true if I get it. Hearing your story adds to the motivation for me to not only get my CCNA this year, but my CCNP for other avenues as well and maybe even the CCIE!

I set this up and port fa0/2 is trusted but I was still able to run Yersinia on port fa0/3 and drain by dhcp pool. Does port security have to be setup as well on fa0/3?

Thanks for the inspiring story about the CCIE. Really made me want to get back on my CCNP track. Don't know if I'll ever get to CCIE honestly but I think I'm smart enough to get CCNP. I'm getting back on this next week. INE is so expensive though for that training. Appreciate you sharing your story and whether you meant it or not, how encouraging it was!

Thank you for all you do to help others! I've said this to you before but my buddy Zeeshan told me to view all your videos when I was learning networking and I've learned a lot over the past years because of the time you've invested into producing content for those who want to learn. Your teaching style makes it easy to understand. You don't teach like you're reading a white paper like a robot, you teach as you're talking to humans and make the technologies relatable.

Thank you so much for your story at the end. I am 52 and am looking to learn new skills. I've chosen to go back to school and learn information and networking. I have been learning for the past six months. It has been challenging and sometimes I want to give up because it seems so difficult. But let me tell you, that when I get a 100% on a packet tracer with no help, I feel like the smartest person in the world. But then I'm back to reality when I am working on the next packet tracer and I can only get to 68%. Talk about feeling miserable. No problem. I continue because that is what makes me me. I love the challenge of learning. Not really sure if I would take the CCNA test, but I know that I will have extra skills. Your channel is what I listen to before I read my class notes. Thank you so much for that 20% that you are offering to so many of us. It really does make a difference.

I've been studying CCNA for a few months now, and I'm so happy I found your videos!!!!! I genuinely started enjoying studying now thanks to you :))) The content you are creating is truly a blessing sir.

Show ip int brief on R-3 had some entries that seemed odd to me, and left me wondering. 1) why does g0/1 have subinterfaces when only 1 device is attached to the switch, and 2) both subinterfaces are on g0/1, but g0/1 itself has an IP address, I always believed the interface hosting the subinterfaces could NOT have an address of its own ? Thanks

Keith, I wish I had seen the video when you first published it. Excellent. my question is when the dhcp server is a virtual server with vmware on vlan 10 and it is connected to the L3 switch via a port-channel defined as trunk ports. there are several vlans on this trunk port as there are servers that are on different vlans. Only 1 dhcp server. do I add the 2 physical ports in the port-channel as trusted and dhcp snooping still work on the ip dhcp snooping vlan command even if they are coming across the trunk port?

Hi Keith, it may be too late to ask but I'm struggling to understand why option 82 would cause an issue. Ive tried googling it but I cant find any information. Would you be able to explain in more detail what issue could be caused?

Thanks for the tutorial, it was very informative and helped me understand the topic clearly and please stay on the soapbox as I found the piece at the end about your move into IT and your continual desire to improve inspiring. Thanks.

Keith you give me motivation…👍🏻

someway, somehow Keith changed my life ! thank you so much ! say thank you from VietNam.

I have got a question. I appreciate your time effort put into these videos.

Can you make etherchannel as trusted ports with dhcp snooping ?

The best part about Keith Barker is that he teaches you things about networking in wonderful and creative/out of the box ways AND he also inspires you.
So, thank you Keith for teaching me DHCP snooping and thank you for inspiring me on setting and aproaching goals. Thank you for helping me find my personal motivation to keep on learning.

You are also the motivational Speaker. Thanks for your free service. Now moving to 37th.

Where is the pratical of this lab would you like to tell me please ?