Usually the other trainers speaks about the areas and lsa types and then shows what happens when you use them. Here you went from the design perspective of what we want to achieve and how to do that, which made the topic intuitive and easy to understand. You're a great teacher.

This is by far the best video to learn about OSPF Area types.

the explanation of why we configure area stub command on each router is mindblowing. Had never read it anywhere before. Wow

So many gold nuggets within this 30 minute video. Took me almost 4 hours to complete watching this video as I have to pause many times, think, and take down notes. Best "OSPF area types" video explanation so far.

There is not a better instructor on networking than this man right here. I've had the opportunity to learn from him in class. Unbelievable teacher, mentor, and a fantastic person!

Without a doubt the best ospf types explanation on the web. Brilliant!

Hands down the best explanation I saw for OSPF. We need more of this Narbik pleaseee!! 💯

Awesome lecture - descriptive and very informative, You are an amazing teacher!

No matter what Vendor equipment type you are responsible to managing, this is the best explanation for the various OSPF Areas types and in some regards OSPF LSA's as well. Thank you Narbik.

Best OSPF area type video around BY A MILE

I think this is the best explanation for LSA's i saw. Great job Narbik and thank you for sharing this.

Far the best breakdown on Areas and routing you can get free of charge.

Thank you for this. The best tutorial for OSPF Area types I've watched

Brilliant concise explanation. The best and simplest I've seen. Many thanks!

I must say "The best video I have seen explaining the Area types". Explainations along with gestures are amazing combo to understand.:)

What a breath of fresh air to have someone who has planned the presentation in detail and speaks clearly. I learned a lot, I salute you sir.

Thanks for breaking down the concept that is complicated to follow let alone to understand.

Absolutly brillant demonstration, clear complete structured.... What a good instructor you are. Tks a lot.

Best Lecture on OSPF Areas and LSA types. Pure explaination and zero timepass. Thanks Narbik..

Two comments: 1. This is absolutely the best OSPF Area type Video. 2. Next video, would be great if audio is slightly louder.

This method of teaching is quite useful! I do appreciate the whiteboard method as the concepts build as you go. Conceptually, very clear.

The best explanation of OSPF Areas ever found, outstanding

No match with white board or black board method of teaching most effective and impressive way of delivering the knowledge

VEry well explained with routing table, command to define an area. Wholesome video. thanks.

super great and clear explanation thanks. The best video in years for learning OSPF

Amazing video.. this can be a tricky topic to understand but Narbik explains it so well and makes this crystal clear. What a legend.

Awesome, what a clear understanding it gives regarding routes in OSPF. Thanks for posting such Video.

My deadly Notes: EVERY AREA NEEDS A DEFAULT ROUTE (as a pointer to a corresponding ABR either from External route or Internal) [Type1] - Each router generates a Type 1 LSA that lists its active interfaces, IP addresses, neighbors and the cost. LSA Type 1 is flooded only within an area. [Type2] - Type 2 LSA is sent out by the designated router (DR) and lists all the routers on the segment it is adjacent to. Type 2 LSA are flooded only within an area. It contains the information about DR's. [Type3]- Type 3 LSAs are generated by Area Border Routers (ABRs) to advertise networks from one area to the rest of the areas in Autonomous System. It contains the information about inter-area routes. [Type4] - It is generated by the ABR and contain routes to ASBRs. [Type5] - External LSAs are generated by ASBRs and contain routes to networks that are external to current AS. [Type7] - Stub areas do not allow Type 5 LSAs.  A Not So Stubby Area (NSSA) allows advertisement of Type 5 LSA as Type 7 LSAs. Type LSA is generated by an ASBR inside a Not So Stubby Area (NSSA) to describe routes redistributed into the NSSA.  

This is gold! I can't believe I didn't come across this lecture earlier. Thanks a lot!

This is a great explanation. Thank you. Looking forward to more like this.

what can I say, he explained all my doubts so easy and very precise way!

This is by far the best explanation of OSPF I've ever seen!

it's the best explanation that i found about ospf area types, Thank You Narbik Kocharians

Best Video ever explaining OSPF. Excellent work. Great explanation for this topic.

Absolutely the best OSPF area types explanation

Sir you smashed it , great, great, great explanation ever i found.

Clear, concise, easily digested. Fantastic! I will achieve my goal of becoming a CCIE (Security) Thanks Narbik!

This brings back memories. Narbik is a fantastic teacher.

Great instructor and training video on OSPF, thank you

Sir i don't know what to say you have explained it in very clear and concise way.marvellous explanation I came across thanks alot❤️

Learnt ospf in the best way. Thank you for the detail explanation.

Nicely explained and want to see more videos! Nice work sir.

Excellent work! I hope near future will come soon to see your next great work as you promised at the end of this video ;)

Awesome! I learned something new in this video and i love the teaching style, Thank you Narbik!

Thank you very much for the best video out there describing OSPF Area Types!

Great explanation, thank you very much for that! I hope to see other videos here.

Thank you for the quick review - I haven't used OSPF since studying for my CCNP in a lab, but now I need to know it :-)

so straight foward, No BS - Amazing!!

You are an excellent teacher and communicator. I'd love to see more of your videos.

I very impressed with the way you are explaining OSPF Area

Thank you Mr.Narbik. This is a great tutorial.

Awesome video..Looking forward for more such videos!!

Great explanation on this topic. Thank you for your help!

I'm currently studying computer systems and networks at university, thank you for this, very helpful !!!

A very clear and concise expert explanation... Its such a shame he only has one video.... I could do with more of his knowledge ☺

Thank's so much, you explain OSPF area very clearly.

Amazing .Well explained .Please upload more videos .

Best video on ospf area...thanks a lot....

This gentleman is an incredible teacher!

Watched this multiple times whenver i want to refresh i come here.

very good exlpaination stub , t stub ,nssa, t nssa and lsa types super Sir .

very instructive and distinguished, thank you sir for this great effort

You are awesome, sir!

Great! Very clear and easy to follow.

Splendid sir!

Best OSPF Area Type concept , Thanks expecting next video OSPF , BGP

you are simply superb ... no words to explain !!!!! waiting for your upcoming videos .....

I like so much this way of teaching, awesome

Great lecture. Thank you!

awesome presentation, very clear. Thank you so much!

He is the very best, true legend bar none

Amazing explanation! Thank you.

Absolutely fantastic sir. Thank you so much.

Amazing, the way you simplify OSPF area types, it was really awesome, this was a confusing topic for me ever, which has been cleared now, Thanks a lot Sir.

Very good explanation Narbik.

Thanks for the explanation Sir. I got my doubts cleared.

incredible teacher! Thanks

Simply Amazing!!

Effective teacher, Thank you!

Upload more! Such a great explanation!

I’m watching because this guy is a handsome daddy bear. Woof

Thank you for the video, it helped me a lot.

Awesome explanation.

Amazing..actually thunder striking vedios......

Sir you are explaining is ultimate and awesome. I never ever saw trainer like you. Request you to please share BGP & ASA Labs as well. Thanks for your time.

Great explanation. It is pleasure learn from you.

so clear explanataion ever I have seen.. Thank you very much

Please upload more videos on different topics .you are a great teacher.Expecting more videos from you

One of the best explanations of area's and LSA's I would have been very useful for me if I could take a screenshot of your board. The whole screen was never shown.

Excellent topology Excellent explaination Excellent Presentation. Clearly understood the entire Area topic. Thanks, A lot Sir.

Great special area explaination

Very good - now i know this part of OSPF.

I think its ideal video of stub ,totally stub,NSSS,Totally NSSA

Wow! This was so good!

Great teacher!

brilliant explanation !

Wow, excellent... refreshing

Wonderfull and outstanding video. thanks a million :)

just great!

Thanks you, this is best video.