Don't flip out about that 7th bit in IPv6 (EUI-64 does it for you)❗ | Cisco CCNA 200-301

EUI 64 bit flipping is something a CCNA should know about, in addition to how IPv6 addresses operate. This video provides the inside scoop, and demonstrations of it it in action.
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[@mattanderson8458]

Thanks so much for this, Keith. I was doing an assignment and was stumped, but your video helped me grasp it better than reading slides off of a presentation and trying to teach myself.

[@KeithBarker]

Glad it helped!

[@digitaldistancerecords736]

Thank you, I was reading the study guide and it just wasn't clicking, now I get!

[@KeithBarker]

Thank you @digitaldistancerecords736!

[@msconfig9786]

I am amazed every time i watch your video’s, you can literally break it down for even a baby to understand.
Thanks for all you do!!!

[@KeithBarker]

Thank you msconfig!

[@pinderant]

Thank you so much, Keith. I was beginning to lose my mind trying to figure out IPv6 addressing. I am now confident I can master it.

[@sidefmovies]

This is spooky, just started to refresh ipv6 today and I see a reference to the flipped bit... I was thinking 🤔 hmmm what was that all about again. Then boom this video pops up. Perfect timing thanks Keith. 👍🏻

[@KeithBarker]

Thank you sidefmovies!

[@Pyxe_ZA]

Thanks a million. I can't tell you how many videos I've watched to try and understand this. The other videos address it as if the person watching it is a tenured network tech. The videos go on for 30+ minutes, and by the time it's done, you're even more confused. This video is so basic, simple and to the point, ESPECIALLY showing HOW to count to get to the 7th bit

[@KeithBarker]

Glad it helped!

[@alberttaylor2754]

Thanks Keith, I did HORRIBLE at your Kahoot quiz yesterday and a big part of my bad performance was due to my woefully bad understanding of EUI-64 bit flipping. This vid opened my eyes, Thank you.

[@KeithBarker]

Happy to do it, thanks for the feedback Albert Taylor.

[@JT-qt5fl]

damn man great vid!! was using a udemy course and the guy glanced right over this and had me so confused!!!
explained perfectly!

[@KeithBarker]

Happy to do it, thanks for the feedback JT.

[@mikec771]

it's nice not having to change the playback speed to 1.25 or 1.5 which I have to for almost all other networking videos. Quick and to the point. I'll be watching more of your videos sir.

[@KeithBarker]

Thank you Mike C!

[@WasiuAbbey-sq8hp]

OMG , this really help me , very straight forward

[@KeithBarker]

Thank you @WasiuAbbey-sq8hp!

[@Clovistered]

Thank you so much for this you made it fun and practical, reading the book on this was very confusing you made it seem very easy to understand. Thanks once again it helps a ton !

[@KeithBarker]

You are so welcome!

[@manojmemane4974]

One of the best teacher. Thanks Kieth

[@KeithBarker]

Thank you Manoj Memane!

[@zsoltkiss-szekely8137]

very well put... still for the exam, you need to flip that bit in your mind. It still feels a bit spooky to go and do it in like 10-15 seconds

[@KeithBarker]

Thank you Zsolt Kiss-Székely

[@EA-fb7ug]

Thank you Keith.

[@AhmedAli-fr5yt]

In Cisco Course on Netacad, zero are omitted and the 7th bit calculated from 88 (1000 1000) will be 8a (1000 1010)

[@KeithBarker]

Thank you Ahmed Ali!

[@AhmedAli-fr5yt]

@@KeithBarker I have reviewed many examples, I find your approach is correct.

[@randallbratton8954]

Just one correction: With the U/L bit, you said it backwards. The values are: 0 = Universal and 1 = Local. Burnt in MAC addresses always have a 0 in that bit. When a user changes the MAC address using a command, this is a locally administered address, and SHOULD have a 1 in that bit. Some vendors enforce this, and when you change your MAC address they automatically make the U/L bit a 1. Your Cisco router does not enforce the rule. If it did, it would not allow you to set your MAC address to 0088.8888.8888. It would either reject the command, or it would automatically change the bit, and your MAC address in running-config would be 0288.8888.8888.

[@jm5514]

Thanks for awesome videos, @keith ! Really helpful! Question - what's the ipv4 equivalent of the eui-64? i feel like i have a good grasp of ipv4 and now trying to understand ipv6 as well.. i understand ipv4 has different types of addresses like unicast and multicast etc and host and network portions, so to which of those would you compare eui-64? i'm trying to understand what it represents in terms of addresses... Would appreciate an explanation if possible please - thanks so much!!

[@KeithBarker]

Thank you for the question Y M. There is no IPv4 equivalent function or feature of auto-creating a host address like IPv6 does with eui-64.

[@theboatswains-yt]

Thanks for explaining this!

[@KeithBarker]

You bet!

[@morganscott5588]

Great demo!!! I would add, don't freak out if you see a well known practice exam series that gets this wrong, and provides an incorrect explanation based on some old thinking of how the 7th bit might be used, but was never implemented. Trust that the 7th bit (3rd bit of 2nd nibble) "Always" flips in UEI-64 :)

[@KeithBarker]

Exactly! Thank you Morgan.

[@randallbratton8954]

Yes, this is true in the context of IPv6 discussion. The actual EUI-64 standard does not flip the bit. However, IPv6 always uses Modified EUI-64, which means it performs EUI-64 and then flips the 7th bit. In most IPv6 documentation, they leave off the word "modified" and just call it EUI-64.

[@ernestcaravalho9074]

You inspire me to be a better IT dude :) Thank you.

[@KeithBarker]

Wow, thanks

[@Sulecio11]

This is great. Thanks for the amazing content Keith. 👏🏻

[@KeithBarker]

Thank you César Sulecio!

[@frankbravo581]

Thanks mate, I got it straight away

[@KeithBarker]

Thank you @frankbravo581!

[@ronvainshtein4362]

Love your videos keith. Keep up the great work!

[@KeithBarker]

Thanks, will do!

[@sharegull]

very well explained thank you

[@KeithBarker]

Glad it was helpful!

[@alexisanyanwu2016]

Your are great sir Keith

[@KeithBarker]

Thank you Alexis Anyanwu!

[@nesternunez8430]

Now that I think about, 000000X0 would be a pretty cool tattoo.

[@Cochabamba37]

Asante Sana kieth

[@MI-qx4lc]

Great content keep up the good work!

[@KeithBarker]

Thanks, will do!

[@Raj75580]

Thanks a lot 👍

[@KeithBarker]

Thank you Sukumar Akoju!

[@fahadoutlook1241]

why they flip it ? what is actual reason behind flipping 7th bit ?

[@mouadjadil2958]

pls tell me if you now know

[@zroqs]

Excellent

[@KeithBarker]

Thank you Gustas Dirgela!

[@chrisyo4461]

Brilliant

[@KeithBarker]

Thank you Chris Yo!

[@jongreenhill777]

What is the point of flipping the 7th bit ?

[@mouadjadil2958]

pls tell me if you now know

[@jongreenhill777]

@@mouadjadil2958 yes I got it. Thank you.

[@msdarwin04]

So if I have a MAC of 18:fc:b6:42:d1:cc, then my Link Local would be FE80::1afc:b6ff:fe42:d1cc ?

[@KeithBarker]

Thank you for the question Michael Darwin. Yes, you nailed it.

[@charlesyaw6514]

You’re awesome

[@KeithBarker]

Thank you Charles Yaw

[@charlesyaw6514]

First to like, Keith

[@ibrahimbarrie4180]

Thank you Keith.

[@KeithBarker]

Happy to do it, thanks for the feedback Ibrahim Barrie.

[@jerryjacob75]

Excellent

[@KeithBarker]

Thank you! Cheers!

[@tech-checkzone634]

Thank you Keith Sir

[@KeithBarker]

Welcome!