The preamble is used only on 10 Mb. On 100 Mb and faster, a different coding method is used and some reserved symbols are used to delimit the frames. Same with the inter-packet gap. Also, frames are no longer limited to 1500 bytes. That's an artifact of the original Ethernet and then by 802.3 using the Ethertype field for length. With DIX ll, it's Ethertype. Frame expansion appeared in the late 90s and now, with jumbo frames, 16K can be used, IIRC. You could have mentioned that if Ethertype/length is 1500 or less, it's an 803.2 frame and 1536 or greater for DIX ll. IP uses DIX and about the only thing that currently uses 802.3 is spanning tree. Other protocols that used to use it are now obsolete. A good reference is Ethernet The Definitive Guide, from O'Reilly and, for a bit of history, you might want to download the Ethernet Blue Book (Gordon Bell), which goes into the original DIX protocol, before DIX ll & 802.3.
@@James_Knott I hope someone like yourself or the original creator of this video will explain it with updated info. I have a logistics background and would understand things better if explained in logistics form.
Are you sure about this? The preamble isn’t part of the frame, but has always been used to indicate the start of the frame for synchronization. No where have I heard or read that this has changed, for Ethernet II or 802.3. If so please provide proof.
I just want to add the 3 in 802.3 came from the fact that the guys from Digital Intel and Xerox were sitting at Table 3 of a restaurant (the Wagon Wheel) in San Jose, when they came up for the specification. The rest is history.
wait, if you have a 42-1500 bytes w/802.1Q how do you get 1522? I think that its always "min 46 max 1500" then you have 18bytes from the eth frame or 22 with the Eth frame w/802.1Q Without 802.1Q: 64-1500 + 18 = 1518 With 802.1Q: 64-1500 + 18 + 4 = 1522
I understand that VLAN-tagging (TPID + PCP + DEI + VID) is inserted before the EtherType field, but can someone explain when “0x8100 VLAN-tagged frame” is used in EtherType field?
it is used when you have multiple vlans, if you have only the default vlan it is assumed all the frames go to the default vlan, when you enter the comman encapsulaion dot1q :vlan number: command it is when you basically tell that subinterface for instance, to be the subinterface responsable for that specific vlan. you can exercise this with wireshark and see the standard ethernet frame, and the ethernet frame when it is tagged.
Can you tell me why the destination address comes first in this ethernet frame? By default source address is first and then only the destination address. What is the logic behind this?
@@danscourses haapy to hear from you Sir you the first who initiated me to networkin just to tell ou i recently passed my CCNA 200-301 AND NOW I M PREPARING FOR CCNP ENCOR I WAS JUST WONDERING IF YOU COULDN4T HELP ME OUT WITH THIS JUST BY SOME ADVISES OR THOUGHTS THX FOR ALL
Sure if he was trying to explain this to attempt to help you transition from whatever level of knowledge you have, he could have done an overview and recapped on essential concepts but this is far from useless
This is probably the most detailed course on the subject that I have seen yet
After this video I have a better understanding of the technology, Thank you..
Excellent Sir, I never seen such a wonderful Explanation with Best Presentation.Thank you Sir Great Job
Very well structured and presented. Thank you
this is the course for the curious guys who really want to handle all the info, i love it, even though it s a bit too advanced, i find it challenging
Wow this is the best way I've ever heard this explained, thanks for such a well thought out video.
Going to watch all your videos. So detailed and I needed it badly!
I love it, the best explanation of the Data Link layer I've ever seen!
A uni exam tomorrow and this is fantastic, thanks for the brilliant content.
Great video! I used it to review for my networking exam. Keep it up!
I love your video's! To the point, detailed and fun to watch.
Bravo, excellent explanation of data link layer
Very detailed and brilliantly explained.
Great and amazing explanation, well done danscourse
This is marvelous, well explained
Thank you for your hard work.
Thanks for the video, found it very easy to follow.
Excellent video. Thanks. I love your work.
The preamble is used only on 10 Mb. On 100 Mb and faster, a different coding method is used and some reserved symbols are used to delimit the frames. Same with the inter-packet gap. Also, frames are no longer limited to 1500 bytes. That's an artifact of the original Ethernet and then by 802.3 using the Ethertype field for length. With DIX ll, it's Ethertype. Frame expansion appeared in the late 90s and now, with jumbo frames, 16K can be used, IIRC. You could have mentioned that if Ethertype/length is 1500 or less, it's an 803.2 frame and 1536 or greater for DIX ll. IP uses DIX and about the only thing that currently uses 802.3 is spanning tree. Other protocols that used to use it are now obsolete.
A good reference is Ethernet The Definitive Guide, from O'Reilly and, for a bit of history, you might want to download the Ethernet Blue Book (Gordon Bell), which goes into the original DIX protocol, before DIX ll & 802.3.
So basically, this video is completely obsolete.
@@Parkhill57 Well, not completely obsolete, but a lot has changed.
@@James_Knott I hope someone like yourself or the original creator of this video will explain it with updated info. I have a logistics background and would understand things better if explained in logistics form.
@@freddyhardware840 I'm really not sure what you're asking for or how logistics would apply
Are you sure about this? The preamble isn’t part of the frame, but has always been used to indicate the start of the frame for synchronization. No where have I heard or read that this has changed, for Ethernet II or 802.3. If so please provide proof.
dd an exam u helped me nail it..thnk u
Congratulations from Brazil.
I just want to add the 3 in 802.3 came from the fact that the guys from Digital Intel and Xerox were sitting at Table 3 of a restaurant (the Wagon Wheel) in San Jose, when they came up for the specification. The rest is history.
Great and very informative video!!
Thanks a lot. Great video!
thanks it was really helpfull
Buenísimo loko
Doesn't CD in CSMA/CD mean Collision Detection (instead of Collision Recovery shown in the first slide) ?
this is it!!!
Thanks for the video. What layer would you say the DHCP server works on?
Layer 3
yessirrrrr!!! Thanks for this.
This is awesome thanks
Perfection
Good job thank you
is frames made before flow control at the data link layer?
wait, if you have a 42-1500 bytes w/802.1Q how do you get 1522?
I think that its always "min 46 max 1500" then you have 18bytes from the eth frame or 22 with the Eth frame w/802.1Q
Without 802.1Q: 64-1500 + 18 = 1518
With 802.1Q: 64-1500 + 18 + 4 = 1522
Are these videos in this playlist are updated? I means CCNA 200-301?
I understand that VLAN-tagging (TPID + PCP + DEI + VID) is inserted before the EtherType field, but can someone explain when “0x8100 VLAN-tagged frame” is used in EtherType field?
it is used when you have multiple vlans, if you have only the default vlan it is assumed all the frames go to the default vlan, when you enter the comman encapsulaion dot1q :vlan number: command it is when you basically tell that subinterface for instance, to be the subinterface responsable for that specific vlan. you can exercise this with wireshark and see the standard ethernet frame, and the ethernet frame when it is tagged.
Gracias!!
Can you tell me why the destination address comes first in this ethernet frame? By default source address is first and then only the destination address. What is the logic behind this?
hey, did you guide me if there are 1510 bits to be sent over ethernet how many would it take? 2?
very interesting and Clair thx
Hi How about a data payload greater than 1500 bytes is transmitted. So how does the fragmentation happen?.
Is all this coded in the shell? ....I am a brand new newbie to IT Support and a little confused....
Thanks again !
is ethernet frame header the same as ethernet frame? if not, which fields are different?
I have on queation is it posible to have a working phone of pc whithout a mac adres and stil acces the internet ?
love your video's do u have any online classes for CCNA am working on my rectification
🐐
thanks.
Hi Dan, can you share this PowerPoint or diagram? As always, thank you for sharing your knowledge...
Yes! I just added the link to the slides in the video description but here it is also: drive.google.com/open?id=19vnT21JflhCMenQNKeCJ4P_OdlJu29mP
wow .🤯
Is this still current in 2024?
i wonder if u are still actve Sir we miss u re lessons
I am still here Majid. What video topics are you interested in?
@@danscourses haapy to hear from you Sir you the first who initiated me to networkin just to tell ou i recently passed my CCNA 200-301 AND NOW I M PREPARING FOR CCNP ENCOR I WAS JUST WONDERING IF YOU COULDN4T HELP ME OUT WITH THIS JUST BY SOME ADVISES OR THOUGHTS THX FOR ALL
Hello vhat open wrong internet adress
way too detailed useless give an over view thn graduallu add details
Sure if he was trying to explain this to attempt to help you transition from whatever level of knowledge you have, he could have done an overview and recapped on essential concepts but this is far from useless