I have been studying for the CCNA for about a year. I have the official text books which I have read several times. I have also spent countless hours going through two video courses (one paid and one free). No matter how much effort I have put into my studies, I just never felt like was getting it. UNTIL I found Jeremy's videos!!!!!! Amazingly clear and thorough explanation of all topics and very useful quizzes to help ensure the main points are understood. I can't recommend these videos enough. I don't think this information is presented in a more thoughtful manner anywhere. Thank you so much for this amazing resource.
Day 17 is a milestone .....it's like CCNA is saying know your level I am a difficult course but @Jeremy'sITLab made everything simple and all you have to do is to go over the VLANs videos over and over until you find your feet ........Thank you for this amazing work MR Jeremy
0:00 Subscribe to Jeremy / What we learned from the last video 0:49 Things we'll cover 1:55 Network Topology of the last video 2:22 Network Topology for this lesson 4:55 Trunk Ports 6:36 VLAN tagging 12:24 VLAN ranges 13:47 Native VLAN 16:54 Trunk Configuration (SW1) 25:32 Trunk Configuration (SW2) 26:35 Router on a Stick (ROAS) 32:48 Things we covered 34:04 QUIZ!
I worked for an ISP for a while but didn't get into the networking side of stuff mostly just installs and a little bit of replacing/adding new equipment. But everything was GUI. I recently went to a different ISP who uses mostly CLI. They use Juniper and so I started doing the Juniper training and learning CLI... as soon as i got to routing and vlans I was lost they don't explain it very well at all. So i came here and have been doing the labs (albeit over and over again to drill commands into my memory). Jeremy gives a good overall explanation and after going "huh" over at juniper, i did these last few videos and went back to the "huh" vid at juniper and went "oooh ok i get it... why couldn't you just say what jeremy said?" These vids while yes they are for ccna, they're helping with my jncia 10x better than the jncia course. THANK YOU JEREMY'S IT LAB!
I have been searching for the Courses offered for CCNA because for the content but you totally break the myth. On my experience it's is only one the best content videos with free of cost. Great inspiration 👏👏 bro
Jeremy, I did my CCNA more than 20 years ago, and I am able to follow along although with a much older brain! I'm really enjoying your presentations and agrre with lots of other comments, you have a very easy way of explaining things! I did pickup a mistake though! Relax, not in any of the content - your heading at 32:46 reads 'Things we have coverered' :) well done on your channel!
Thanks very much Jeremy for the update. Though am going through the same course from another instructor but am always eagerly waiting for your update cos its the best so far. Can`t wait for the next update.
this one was kind of tough, i took a lot of notes tho. but i think im gonna watch it over to get a better grasp on it. i am however much more knowledgeable in VLANS and know how to configure them. never knew any of that until i watched this video and the previous. thanks for all the info, Jeremy!
@16:20 are frames in the native VLANs transmitted directly through the switches SW1 and SW2. Without getting through the router R1.(for different VLANs)
Good question! If both the source and destination are in the same VLAN/subnet, the frames don't need to be sent to the router, this is the same for the native VLAN or any other VLAN. If the source and destination are in different VLANs/subnets, the frames have to be sent to the router to be routed. Again, it doesn't matter if one of the VLANs is the native VLAN, the behavior is the same.
Well that was a heavy video I had to watch it two times but after all I was proud of myself when I was able to answer the quiz questions! Thank you!! :-)
These videos are a great resource to accompany my other resources when training to be CCNA certified. They'll accumulate a lot of views over the next couple of years.
@28:00 In Packet Tracer, when you create a sub interface, the main interface will be activated automatically so no shutdown isn't really required. However, it's still a good practice to enable it before creating sub interfaces.
Quiz Question 4. c) TCI voice, but PCP on screen. A minuscule problem that I found in your entire set of videos. Congrats and many thanks for you work, Jeremy!
Thank you so much for your time and effort on all of these videos Jeremy, I've been struggling to understand a lot through the traditional IME course I was using before, now I understand everything clearly! Quick question - if we were to try and get the CCNA exam done before the end of the year, what would you suggest we learn from here if we were to use another course? Was hoping to take my exam in May, thank you again so much and look forward to more videos!
You make such daunting concepts seems so simple by the end of every video. You really bring it all together in such a cohesive way like no other instructor. Thanks, Jeremy!
at 15:56 i think the explanation may not be complete. The switch has no clue what VLAN the traffic is intended for. It does assume that the frame is intended for VLAN 30 and, if the MAC address of the destination PC is not in the cache, may flood the frame to the other ports in VLAN 30. The effect is the same - the packet does not reach the intended destination.
I'm assuming that there is regular traffic in the network, so the destination PC's MAC address is in the MAC address table. So, the switch knows that the destination is connected to an interface in VLAN10 (because it's in the MAC address table), but the received frame is in VLAN30 (mistakently, because of the native VLAN mismatch), so it doesn't forward it.
I want a job as datacenter technicam here sweden and this course is all a need! Incredible free course! Now o know more than many datacentertechnicans😁
I think you do a great job of demystifying a lot of these concepts. I feel like I am actually understanding the concepts and making serious progress toward my CCNA.
man, this is the first lesson that has really tripped me up. This covered A LOT. I might need to watch this over a few times. VLANs and trunkports are very in depth, or so it seems right now lol
Take your time to absorb it all. It's hard to catch at first, but VLANs are very important to understand! Also consider checking out some other resources to learn about VLANs from, it's good to hear different perspectives.
@@ataulaleemqureshi608 yeah, very tough. Thankfully I was able to understand the basic principals and pass Jeremy’s quiz at the end. However the next video is another zinger lol when he introduces the commands for STP. This seems more in depth than subnetting or VLANS.
@@onewaydrive_ please let me understand this one first ....watching this video 3rd time hopefully now i will understand next videos i guess i also have to watch 3 times:)have u also learned from another resource?i am just following jeremy sir i guess he is the best ...
Thank you! I'll consider it. Although I use the official exam guide to research some topics, my videos usually don't fit with the chapters of the official exam guide very well, one video might cover little pieces from 2-3 chapters of the exam guide, for example.
Hi Jeremy - On the final quiz Q, your answer was the VLAN does not exist on the switch. My question is around creating the VLAN. In these videos, you create the VLANs on access ports: SW(config)#interface range g1/0 - 3 SW(config-if-range)#switchport mode access SW(config-if-range)#switchport access VLAN 10 If you don't want to create access ports in the first place, can you instead do this by changing the two instances of the word "access" above to "trunk"? Thank you so much for responding to these comments!
At 16:04 there is a statement that "the destination is in VLAN 10 and not VLAN 30. So I won't forward the frame". so as per my understanding till now if the frame is unknown unicast or broadcast then it will forward the frame towards VLAN 30 but as the destination IP address does not exist in VLAN 30 there will be no response. From the statement given it seems the switch will no forward the frame but as per the above details it has to forward in frame in above case. Correct me if I am wrong. Thanks.
These videos have been a lifesaver i cant say thank you enough. Currently in the CCNA course and this has helped me tremendously when i totally didn't understand something. Definitely subbed!
5:40 and few seconds after explaining the trunk port, the sw2 forwards the traffic to sw1 but will this be through router or directly sw1 to sw 2 as the red arrows showing?
Hi Jeremy, thanks for your videos. I wanted to ask why untagged frames are important so essentially what benefit does one have if they use native VLANS?
Hi Jermy, I am excited to give my feedback as I have found you awesome. You really know how to TEACH. I was considering to rather discontinue one of my other online academy course and join yours, but I want to know if your course purchase will include the whole course or you are still making the videos?? Thank you..You are BRILLIANT..
Hey Jeremy, in the example at minute 5:43 when the two PCs communicate within the same VLAN/subnet, why doesn't go PC > SW2 > R1 > SW2 > SW1 PC? Instead, it skips the router and goes straight from SW2 to SW1. Are we assuming that the MAC address is known already? Could you clarify that?
The two PCs are in the same subnet, so there is no need to send the traffic to a router. Routers are used to send traffic between different networks/subnets. The sending PC will use ARP to learn the MAC address of the destination PC.
For Question #5: Using a C3850, if the interface is not connected, the allowed vlans do not show when running "show interfaces trunk" . If you run "show interface g#/#/# switchport", the allowed vlans show under "Trunking VLANs Enabled". FYI
Hi Jeremy, First of all thank you very much for your wonderful course. I have a question here, 15:25, you set an example frame sent from PC on the right side VLAN10 to the left side VLAN10, and as the trunk port has been set up between SW2 and SW1, why the frame is not tagged and that automatically goes into native VLAN? I guess trunk port setup is before native VLAN, and since the frame from PC to PC are both in VLAN 10, why is the frame sent untagged? Thanks for your explanation in advance.
Many Thanks for this series of videos, it is so fantastic I have a question please, Why does SW1 not use its mac address table to know which VLAN the packet belongs to? ( Please see the network I'm talking about at 17:10) I mean, if SW2 receives a packet in G0/2 belonging to PC connected to SW1 G0/1 interface, it should forward it through the trunk link, then when SW1 receives the packet check the MAC Destination address then forward it to the appropriate PC regardless of Vlan Thanks in advance
Hey Jeremy @4:00 you explained traffic from pc2 will arrive with a tag of Vlan 10, so VLAN 20 does not need to be allowed on the trunk, however what about the return traffic from The pc on switch 2 on VLAN 10 back to pc2 on VLAN20?... that should have a TAG on VLAN 20 So switch 2 knows where to send the traffic and if VLAN20 is not allowed then the frame will be discarded. Please explain and thanks
The traffic from the VLAN 10 PC will be tagged in VLAN 10 over the trunk, not VLAN 20. The PC is connected to a switch port in VLAN 10, so the switch assigns all of its traffic to VLAN 10 and therefore tags it in VLAN 10 over the trunk. It reaches the router as VLAN 10 traffic, and then the router sends it out as VLAN 20 traffic to the destination PC.
31:36: Hello Jeremy, I confuse, you said that the router is tagging the frames which sent out of each sub-interface, Is the router is re-tagging the frames on their way out to the switch? Isn't it the switch responsibility? The switch suppose to get the frames from the router as it any other decice on the VLAN and tag it. That it's job, isnt it?
The frames are sent to the router for routing. For example, let's say a host in VLAN 10 sends a message to a host in VLAN 30. The frames arrives on R1's g0/0.10 interface tagged in VLAN 10. R1 then checks the routing table and sees the destination is in the 192.168.1.128/26 subnet, connected to the g0/0.30 interface. So, it sends the packet out of g0/0.30, tagged in VLAN 30.
This one was a little bit easier then the first video...I had problem with the LAB cause I like to recreate it and I was unable to ping the other VLANs. However the Pings did work internally in the VLANs..and when i did the simulation the ping look like it was actually flooding which I thought was weird. Yesterday I did try to solve this by trunking but I just confused myself what trunking was. This video help clarify that.
Hi Jeremy...excellent series and course contents..@3:40...we see an example where PCs in VLAN 20 can send traffic to PCs in VLAN 10 via the router using inter-vlan routing. If VLAN segmentation is supposed to provide some increased level of security, how does this inter-vlan routing provide this security benefit?
Hi Jeremy thanks for the content but I have one doubt at 16:15 u said frame coming from vlan 10 which is native vlan is tagged for vlan 30 but because vlan 10 is native then I think it shouldn't be tagged and because vlan 30 also native switch must forward the packet to vlan 30 however vlan 30 have separate subnet replay won't come but my point is switch should forward the packet...pls help with it
Hello Jeremy. I got a few questions At 13:12 when you were explaining when a PC wants to send to another PC in the same VLAN but different switches. ( PC-X -> SW2 (Tags VLAN 10) -> SW1 -> PC-Y ) Got some questions: 1) PC1 is forwarded to SW1 from SW2 without going through router? 2) If so, does that mean PC-X is sent with destination mac address of PC-Y? Then is the router only used in this case through inter-vlan routing and access to the internet? Meaning if PC-X wants to send to PC-Z in Vlan 30, does that mean PC-X is sent with destination MAC of its default gateway, is this what happens? PC-X -> SW2 (Tags vlan 10) -> R1 (encapsulates dest mac of PC-Z) -> SW2 (Looks at L2 header and sees dest mac add) (removes vlan 10 tag and adds vlan 30 tag) -> SW1 (Looks at L2 dest mac + vlan tag 30) -> PC-Z in vlan 30 Is that correct? Also does the switch decide which vlan tag it puts by looking at the destination mac address? Thank you Jeremy EDIT: I am so sorry, I just realized something, I was just confused. It's like routing. If PC wants to send to a PC in the same broadcast domain, the router is not used. If in another lan, the router is used for routing. Same case in VLANs, vlans are basically also different broadcast domains. So if a PC wants to send to another PC in the same VLAN, the PC will ask itself "Do we belong in the same VLAN?" If yes then it will be sent with dest mac of that PC, if not, dest mac of its default gateway, which then will be sent out with the appropriate vlan tag as explained in ROAS
Days 15, 16 and 17 are where it's starting to show how difficult this is!
Reading this 1 year in the future, and currently on my CCNA journey.
Hope you are have had or having much success sir!
@@leontrey777 Good luck, I stopped in the end.
no its easy still and even on the mega lab, all you need is to have everything memorised
@@londonboy9422 What did you do? Did you stop networking after this? I'm curious as going through same series.
I have been studying for the CCNA for about a year. I have the official text books which I have read several times. I have also spent countless hours going through two video courses (one paid and one free). No matter how much effort I have put into my studies, I just never felt like was getting it. UNTIL I found Jeremy's videos!!!!!! Amazingly clear and thorough explanation of all topics and very useful quizzes to help ensure the main points are understood. I can't recommend these videos enough. I don't think this information is presented in a more thoughtful manner anywhere. Thank you so much for this amazing resource.
Thanks Mike :)
Please make CCNP videos
He just put CCNP courses up recently @@anthonyomisorecanfixit
@@JeremysITLabyea, what about to make Ccnp course? I'd like to buy it in the future, no matter how much u'll ask for it
Exactly same here, those books authors are idiots😂
I believe this series alone has helped many of us find a decent job in the industry. Thank you.
Best comment ever!
100% agree
Day 17 is a milestone .....it's like CCNA is saying know your level I am a difficult course
but @Jeremy'sITLab made everything simple and all you have to do is to go over the VLANs videos over and over until you find your feet ........Thank you for this amazing work MR Jeremy
Jeremy is probably the only one instructor on UA-cam who replies to all of the comments :) Awesome videos!
Thank you! I try to answer them all ;)
I concur, Jeremy is on top of answering so many questions
0:00 Subscribe to Jeremy / What we learned from the last video
0:49 Things we'll cover
1:55 Network Topology of the last video
2:22 Network Topology for this lesson
4:55 Trunk Ports
6:36 VLAN tagging
12:24 VLAN ranges
13:47 Native VLAN
16:54 Trunk Configuration (SW1)
25:32 Trunk Configuration (SW2)
26:35 Router on a Stick (ROAS)
32:48 Things we covered
34:04 QUIZ!
Man.. I've never seen someone on UA-cam explain it so well and clear as Jeremy, well done! I'm really enjoying studying this series thanks to you!
holy cow this guy answered almost all the comments. lots of love and respect.
I check them (almost) every day ;)
@@JeremysITLab Prove it hehe
I worked for an ISP for a while but didn't get into the networking side of stuff mostly just installs and a little bit of replacing/adding new equipment. But everything was GUI. I recently went to a different ISP who uses mostly CLI. They use Juniper and so I started doing the Juniper training and learning CLI... as soon as i got to routing and vlans I was lost they don't explain it very well at all. So i came here and have been doing the labs (albeit over and over again to drill commands into my memory). Jeremy gives a good overall explanation and after going "huh" over at juniper, i did these last few videos and went back to the "huh" vid at juniper and went "oooh ok i get it... why couldn't you just say what jeremy said?" These vids while yes they are for ccna, they're helping with my jncia 10x better than the jncia course. THANK YOU JEREMY'S IT LAB!
Time spent on your videos, is never a wasted time. Thanks for this amazing course !
Thanks, glad you like it :)
what a wonderful video, thorough, detailed, and clear, the best VLAN video I've ever seen.
Jeremy's lectures are very clear and organize. Great teacher.
I have been searching for the Courses offered for CCNA because for the content but you totally break the myth. On my experience it's is only one the best content videos with free of cost. Great inspiration 👏👏 bro
Jeremy, I did my CCNA more than 20 years ago, and I am able to follow along although with a much older brain! I'm really enjoying your presentations and agrre with lots of other comments, you have a very easy way of explaining things! I did pickup a mistake though! Relax, not in any of the content - your heading at 32:46 reads 'Things we have coverered' :) well done on your channel!
Thanks very much Jeremy for the update. Though am going through the same course from another instructor but am always eagerly waiting for your update cos its the best so far. Can`t wait for the next update.
Thanks for following my videos :)
this one was kind of tough, i took a lot of notes tho. but i think im gonna watch it over to get a better grasp on it. i am however much more knowledgeable in VLANS and know how to configure them. never knew any of that until i watched this video and the previous. thanks for all the info, Jeremy!
I think it's a good idea to watch the video twice, to make sure you have a solid grasp on it :)
@16:20 are frames in the native VLANs transmitted directly through the switches SW1 and SW2. Without getting through the router R1.(for different VLANs)
Good question! If both the source and destination are in the same VLAN/subnet, the frames don't need to be sent to the router, this is the same for the native VLAN or any other VLAN.
If the source and destination are in different VLANs/subnets, the frames have to be sent to the router to be routed. Again, it doesn't matter if one of the VLANs is the native VLAN, the behavior is the same.
Thx J. Well understood
Well that was a heavy video I had to watch it two times but after all I was proud of myself when I was able to answer the quiz questions! Thank you!! :-)
Nice, good job! :)
I think you forgot to mention native vlan for ROAS. The command would be: encapsulation dot1q native
I took classes on this few years back but never got my cert. These videos are making things click so much better!
Day 17 took me over 2 hours and 11 pages of notes! Thank you, Jeremy!
Thanks Jeremy for providing these great courses!!
My pleasure!
These videos are a great resource to accompany my other resources when training to be CCNA certified. They'll accumulate a lot of views over the next couple of years.
Thanks, I hope they help!
Jeremy, you are awesome at what you do! I will definitely donate so that you can continue to help others. These video series will change lives
Hello Jeremy! I'm from Argentina and i am starting to learn about cisco switches and routers with your videos. It are of big help for me!!
Guys watch this video twice and takes notes. I had to too watch twice because this was difficult to grasp for me in one setting. Please DONT GIVE UP.
i can't complain, this is wonderful job jeremy.
God bless your soul + spirit.
@28:00 In Packet Tracer, when you create a sub interface, the main interface will be activated automatically so no shutdown isn't really required. However, it's still a good practice to enable it before creating sub interfaces.
Thanks!
Thanks for the tip! I appreciate it :)
Quiz Question 4. c) TCI voice, but PCP on screen. A minuscule problem that I found in your entire set of videos. Congrats and many thanks for you work, Jeremy!
DecemberLast there’s always a mistake somewhere! Thanks for pointing it out
These series were well structured and explained than my college classes. Much appreciated👼
Thank you so much for your time and effort on all of these videos Jeremy, I've been struggling to understand a lot through the traditional IME course I was using before, now I understand everything clearly! Quick question - if we were to try and get the CCNA exam done before the end of the year, what would you suggest we learn from here if we were to use another course? Was hoping to take my exam in May, thank you again so much and look forward to more videos!
Thank you! I recommend Cisco's official cert guide and Neil Anderson's video course on Udemy.
This is something I love more than The Game of Thrones. Thank you, Jeremy.
You make such daunting concepts seems so simple by the end of every video. You really bring it all together in such a cohesive way like no other instructor. Thanks, Jeremy!
I appreciate the focus of and detailed explanations in your quiz questions. Thank you for your attention and care.
Hi Jeremy small note on the quiz at 36:50 option C should be TCI or PCP
at 15:56 i think the explanation may not be complete. The switch has no clue what VLAN the traffic is intended for. It does assume that the frame is intended for VLAN 30 and, if the MAC address of the destination PC is not in the cache, may flood the frame to the other ports in VLAN 30. The effect is the same - the packet does not reach the intended destination.
I'm assuming that there is regular traffic in the network, so the destination PC's MAC address is in the MAC address table. So, the switch knows that the destination is connected to an interface in VLAN10 (because it's in the MAC address table), but the received frame is in VLAN30 (mistakently, because of the native VLAN mismatch), so it doesn't forward it.
the subtitles are life savers
I want a job as datacenter technicam here sweden and this course is all a need! Incredible free course! Now o know more than many datacentertechnicans😁
Thanks Jeremy I did a networking class getting my AAS and this really just brings it all together
A lot of information in this lesson. Need see again many time to remmember and understand. Thanks Jerrymy for providing this course.
Thank you once again Jeremy. Incredible video, can't express how much we all appreciate the hard work you've put into these videos!!
The best CCNA course you can find on the internet and totally for free
I think you do a great job of demystifying a lot of these concepts. I feel like I am actually understanding the concepts and making serious progress toward my CCNA.
man, this is the first lesson that has really tripped me up. This covered A LOT. I might need to watch this over a few times. VLANs and trunkports are very in depth, or so it seems right now lol
Take your time to absorb it all. It's hard to catch at first, but VLANs are very important to understand! Also consider checking out some other resources to learn about VLANs from, it's good to hear different perspectives.
same here :(
@@ataulaleemqureshi608 yeah, very tough. Thankfully I was able to understand the basic principals and pass Jeremy’s quiz at the end. However the next video is another zinger lol when he introduces the commands for STP. This seems more in depth than subnetting or VLANS.
@@onewaydrive_ please let me understand this one first ....watching this video 3rd time hopefully now i will understand next videos i guess i also have to watch 3 times:)have u also learned from another resource?i am just following jeremy sir i guess he is the best ...
@@onewaydrive_ At last got it :)
You the best man, great quality content, never seen anybody explaining this much clear.
Oh, that was one hell of a long and info filled lecture. Finally, done. Thank you, Jeremy (and my patience)
Great job! You can add in the description which part of the official exam guide you covered in the video. :)
Thank you! I'll consider it. Although I use the official exam guide to research some topics, my videos usually don't fit with the chapters of the official exam guide very well, one video might cover little pieces from 2-3 chapters of the exam guide, for example.
Dang Jeremy, you are doin god's work. I will read my exam questions in that Canadian accent
Haha, it's an honour (with a 'u'!)
Bro now I am realizing how compulsory it is for me to watch your tutorial after I finish reading every corresponding chapter.
Dear sir how can I express my heartfelt thanks to you, I really don't know. Please keep going sir, we really need you. Take my respect and love sir.
At 13:20 of the video, why SW2 didn't forward the frame to the PCs in the Engineering Dept. network with VLAN 10 and with the same source PC?
Hi Jeremy - On the final quiz Q, your answer was the VLAN does not exist on the switch. My question is around creating the VLAN. In these videos, you create the VLANs on access ports:
SW(config)#interface range g1/0 - 3
SW(config-if-range)#switchport mode access
SW(config-if-range)#switchport access VLAN 10
If you don't want to create access ports in the first place, can you instead do this by changing the two instances of the word "access" above to "trunk"?
Thank you so much for responding to these comments!
Jeremy!!! Thanks a lot! Question! on 32:43 why does the frame go to SW2 and then to R1 instead of going directly from SW2 to SW1?
Because it needs to be routed by the router, the source and destination are in different subnets/VLANs.
stay blessed Mr. Jeremy
Thank you Saul, you too!
At 16:04 there is a statement that "the destination is in VLAN 10 and not VLAN 30. So I won't forward the frame". so as per my understanding till now if the frame is unknown unicast or broadcast then it will forward the frame towards VLAN 30 but as the destination IP address does not exist in VLAN 30 there will be no response.
From the statement given it seems the switch will no forward the frame but as per the above details it has to forward in frame in above case.
Correct me if I am wrong. Thanks.
Dear @Jeremy's IT Lab, thank for doing this for us, can you share with me any notes or slides.
Sorry, no notes or slides!
Voice of pronounciation is clear
Very well explained , your series is the best , please upload the remaining topics also as I am preparing for my CCNA based on your videos :)
I will continue to upload one video per week ;) Still making videos!
@@JeremysITLab thanks ! Looking forward to it
Great and powerful video for the first time I understand this topic thank you
I love how that you don't just answer the quiz questions, but also explain why the other answers are incorrect.
Thank you :) I think that's very important!
@@JeremysITLab Couldn't agree more
These videos have been a lifesaver i cant say thank you enough. Currently in the CCNA course and this has helped me tremendously when i totally didn't understand something. Definitely subbed!
Thanks for the sub!
5:40 and few seconds after explaining the trunk port, the sw2 forwards the traffic to sw1 but will this be through router or directly sw1 to sw 2 as the red arrows showing?
Hi Jeremy, thanks for your videos.
I wanted to ask why untagged frames are important so essentially what benefit does one have if they use native VLANS?
no words sir, the way ur explaining style , student from india
😁
Thank you Jeremy, you are the best !!!
Thank you!
Your videos are just amazing and understandable.Thank you !!!
Thank you :)
Hi Jermy, I am excited to give my feedback as I have found you awesome. You really know how to TEACH. I was considering to rather discontinue one of my other online academy course and join yours, but I want to know if your course purchase will include the whole course or you are still making the videos?? Thank you..You are BRILLIANT..
Still making the videos!
Thank you Jeremy. Explanation is clear..God bless you.
Thank you :)
Hey Jeremy, in the example at minute 5:43 when the two PCs communicate within the same VLAN/subnet, why doesn't go PC > SW2 > R1 > SW2 > SW1 PC? Instead, it skips the router and goes straight from SW2 to SW1. Are we assuming that the MAC address is known already? Could you clarify that?
The two PCs are in the same subnet, so there is no need to send the traffic to a router. Routers are used to send traffic between different networks/subnets. The sending PC will use ARP to learn the MAC address of the destination PC.
Thanks so much for these courses, Jeremy. They have been a tremendous help for me.
16:05 The switch didn’t forward the frame because in its vlan 30 switch table there is no MAC address matching or another reason?
Thanks, Jeremy. Fantastic videos. God bless.
Thanks, Sanjay!
Thank you very much Mr. Jeremy. The lessons are very interesting and helpful.
Thanks for all your kind words :)
Thank you for the update, Jeremy!
My pleasure :)
For Question #5: Using a C3850, if the interface is not connected, the allowed vlans do not show when running "show interfaces trunk" . If you run "show interface g#/#/# switchport", the allowed vlans show under "Trunking VLANs Enabled". FYI
Hi Jeremy,
First of all thank you very much for your wonderful course.
I have a question here, 15:25, you set an example frame sent from PC on the right side VLAN10 to the left side VLAN10, and as the trunk port has been set up between SW2 and SW1, why the frame is not tagged and that automatically goes into native VLAN?
I guess trunk port setup is before native VLAN, and since the frame from PC to PC are both in VLAN 10, why is the frame sent untagged?
Thanks for your explanation in advance.
In this scenario, VLAN10 is the native vlan meaning it is untagged.
Many Thanks for this series of videos, it is so fantastic
I have a question please, Why does SW1 not use its mac address table to know which VLAN the packet belongs to? ( Please see the network I'm talking about at 17:10)
I mean, if SW2 receives a packet in G0/2 belonging to PC connected to SW1 G0/1 interface, it should forward it through the trunk link, then when SW1 receives the packet check the MAC Destination address then forward it to the appropriate PC regardless of Vlan
Thanks in advance
Hey Jeremy @4:00 you explained traffic from pc2 will arrive with a tag of Vlan 10, so VLAN 20 does not need to be allowed on the trunk, however what about the return traffic from The pc on switch 2 on VLAN 10 back to pc2 on VLAN20?... that should have a TAG on VLAN 20 So switch 2 knows where to send the traffic and if VLAN20 is not allowed then the frame will be discarded. Please explain and thanks
The traffic from the VLAN 10 PC will be tagged in VLAN 10 over the trunk, not VLAN 20. The PC is connected to a switch port in VLAN 10, so the switch assigns all of its traffic to VLAN 10 and therefore tags it in VLAN 10 over the trunk.
It reaches the router as VLAN 10 traffic, and then the router sends it out as VLAN 20 traffic to the destination PC.
@@JeremysITLabthanks yes,makes sense now 👌🏻
thanks for the videos man, i cleared ccna in 3 weeks.
Thanks for your vids. Using all the supplementary study material as well. Very helpful in understanding and hands on training
You explain all of this very well, but HOLY MOLY its a lot.
As Always.....Lots of love from India .....
Thank you Prati!
31:36: Hello Jeremy, I confuse, you said that the router is tagging the frames which sent out of each sub-interface,
Is the router is re-tagging the frames on their way out to the switch?
Isn't it the switch responsibility?
The switch suppose to get the frames from the router as it any other decice on the VLAN and tag it. That it's job, isnt it?
The frames are sent to the router for routing. For example, let's say a host in VLAN 10 sends a message to a host in VLAN 30.
The frames arrives on R1's g0/0.10 interface tagged in VLAN 10. R1 then checks the routing table and sees the destination is in the 192.168.1.128/26 subnet, connected to the g0/0.30 interface. So, it sends the packet out of g0/0.30, tagged in VLAN 30.
This one was a little bit easier then the first video...I had problem with the LAB cause I like to recreate it and I was unable to ping the other VLANs. However the Pings did work internally in the VLANs..and when i did the simulation the ping look like it was actually flooding which I thought was weird. Yesterday I did try to solve this by trunking but I just confused myself what trunking was. This video help clarify that.
Hi Jeremy...excellent series and course contents..@3:40...we see an example where PCs in VLAN 20 can send traffic to PCs in VLAN 10 via the router using inter-vlan routing. If VLAN segmentation is supposed to provide some increased level of security, how does this inter-vlan routing provide this security benefit?
We can configure security policies on the router to control which devices can communicate with each other
Thanks for yet another incredible video Jeremy!
Thank you :)
Hi Jeremy thanks for the content but I have one doubt at 16:15 u said frame coming from vlan 10 which is native vlan is tagged for vlan 30 but because vlan 10 is native then I think it shouldn't be tagged and because vlan 30 also native switch must forward the packet to vlan 30 however vlan 30 have separate subnet replay won't come but my point is switch should forward the packet...pls help with it
At 5:33, why doesn't the sw2 forward to R1 first before it send to sw2? Thought only routers can do inter vlan routing?
its not inter-vlan in this case its from vlan 10 to vlan 10
Awesome playlist. Thank You for your kindness!!
thanks a lot jeremy this your videos and your channel is the best. hope you more success.
Thank you :)
Thanks for the great video, I have understood Vlans better now.
Nice, I'm glad to hear that!
3:18 regarding to vlan30, why not it connects to R1 via SW1 directly instead of vlan30-SW1-SW2-R1?
Just picked up a copy of ExSim from your link! I hope you get some kind of credit/cut of that! I also told them where I heard about them :)
Thanks Bobby! I'll get a little cut from it, much appreciated ;)
Perfect explanation ! thank you very much, learned a lot
Hello Jeremy. I got a few questions
At 13:12 when you were explaining when a PC wants to send to another PC in the same VLAN but different switches.
( PC-X -> SW2 (Tags VLAN 10) -> SW1 -> PC-Y )
Got some questions:
1) PC1 is forwarded to SW1 from SW2 without going through router?
2) If so, does that mean PC-X is sent with destination mac address of PC-Y?
Then is the router only used in this case through inter-vlan routing and access to the internet?
Meaning if PC-X wants to send to PC-Z in Vlan 30, does that mean PC-X is sent with destination MAC of its default gateway, is this what happens?
PC-X -> SW2 (Tags vlan 10) -> R1 (encapsulates dest mac of PC-Z) -> SW2 (Looks at L2 header and sees dest mac add) (removes vlan 10 tag and adds vlan 30 tag) -> SW1 (Looks at L2 dest mac + vlan tag 30) -> PC-Z in vlan 30
Is that correct?
Also does the switch decide which vlan tag it puts by looking at the destination mac address?
Thank you Jeremy
EDIT: I am so sorry, I just realized something, I was just confused. It's like routing. If PC wants to send to a PC in the same broadcast domain, the router is not used. If in another lan, the router is used for routing.
Same case in VLANs, vlans are basically also different broadcast domains. So if a PC wants to send to another PC in the same VLAN, the PC will ask itself "Do we belong in the same VLAN?" If yes then it will be sent with dest mac of that PC, if not, dest mac of its default gateway, which then will be sent out with the appropriate vlan tag as explained in ROAS
I thought I understood this subject until I watched the full course here. The teaching is excellent. Thank you so much.
Nice! I'm glad my videos helped deepen your understanding :)
From Chile, Thank you so much for all yours videos, it's help me a lots, regards,
the best course for those who want to learn network
Day 17 was awesome! Thank you Jeremy!