Free CCNA | Spanning Tree Protocol (Part 1) | Day 20 | CCNA 200-301 Complete Course

[@adrians4319]

You really can see the difference between someone who taught for a living and then became an IT pro who teaches versus someone who did IT for a living and became a teacher. Your teaching experience really shines through. You are better than all the paid courses I have spent money on. Please keep up the good work!

[@boweidu1012]

Same here😂 I paid for one course on Udemy. But this free série of course is much much better. I regretting paying that much😢😢😢

[@stardustmotion]

ngl school system feels kind of obsolete in efficiency next to those online resources given how freely you can use them

[@MaiCrapToiYeu]

wibu ​@@stardustmotion

[@keithjustice3310]

100% Being a techy myself I struggle to put things into laymen's terms for people.

[@אהלןסהלן]

​@@boweidu1012 Don't regret your choice, as ir lead you here in consequence :)

[@OmarMatar-qe3vz]

This single lecture alone took me 1 week to understand. Every lecture I watch, I make sure I don't get out of it until I completely understand every concept, topology, or example. Thanks, Jeremy, for all this tremendous effort to accomplish this inclusive course.

[@ghosttheripper8656]

I am trying the same route, the clans took me the longest… saw the light at the end of the tunnel then got hit with the day 19 video 🫠

[@ran_ma2678]

DAY 20 Y'ALL 🎉🎉🎉🎉🎉🎉Congratulations to us. Keep pushing☺

[@aazzam4165]

Thank you!!!

[@littlejin-n8x]

i fee like i forgot everything about vlan why so hard :(

[@konradwerner4134]

@@littlejin-n8x 🙋🏽‍♂

[@keithjustice3310]

@@littlejin-n8x Yea that is one of my biggest issues with studying for CCNA is the flavors of vlan/trunking and remembering all of the topics and what goes to what. Like the information for Vlans, Etherchannel, Trunking, VTP/DTP then you have STP and its flavors and all of their similarities and differences.

[@Rasukutty777]

​@@aazzam4165 How did you do that

[@majidmushtaq4209]

Thank you sir. Passed CCNA today because of you. Getting interested to pass CCNP Inshaa Allah... you are an amazing mentor...

[@RashidKhan-iq6my]

salam bro can i have your fb or insta ID?

[@mfskits]

allahumabarik my friend

[@abdihalim7788]

Alhamdulilah bro what are other resources did u use apart from jeremy videos

[@majidmushtaq4209]

Majid Mushtaq Sheikh

[@mdsameer2774]

Hi bro! Did you get the networking job?@@majidmushtaq4209

[@jameschua9255]

I've listened to few online trainers and you are by far, the most systematic trainer that makes every topic easy to understand. Plus quiz to reinforce learning. Top-grade trainer indeed!!!

[@JeremysITLab]

Thanks, James!

[@mohammedzak16]

content very easy to comprehend. thanks for sharing.

[@syundown6005]

Watchinig this my third time around as a refresher after finishing the course! For anyone else going through this, it feels a lot easier to grasp oncce you've understood it once, I just need to go over the harder concepts again to remember the important details I'd forgotten about like how bridge id is calculated. Don't be scared of forgetting as you can always go back; as long as you put in the effort to learn it well the first time around, it'll be easier the second, and even easier the third. Additional tip: Make sure you take really good notes while watching these videos!! It's been so extremely helpful to me whenever I need to check something I'm not sure about or forgotten about because I know exactly to find the information in my notes. And it's a lot easier to recall because I've made sure to write it down in a way I know I understand, so it's like an "Oh yeah, that's right!" kinda thing. Good luck!

[@doncecilmusic5371]

I'm always happy when I get your notifications. God bless you Jeremy. You're a super hero

[@JeremysITLab]

Thank you Cecil! Never been called a super hero before, I wish I got a cooler superpower...

[@devmiztainsane]

@@JeremysITLab Ciscoman, *insert theme song* hahaha, keep up the great teaching as always Jeremy!

[@Felix-ve9hs]

@@devmiztainsane I hope *Ciscoman* will grant me the power of *CCNA* some day :^)

[@fritzdamiendengambog9169]

Cecil you got it the guy is super hero

[@JZB-2022]

@@devmiztainsane CUCM Defualt Hold music

[@echoslam5170]

I have watched this video 3 times to fully understand the concept. Thank you for making these videos Jeremy!

[@JeremysITLab]

Nice! Spanning tree is very important, so it's good to take your time ;)

[@tylermassey5431]

You have a unique way of satisfying little curiosities that pop up in the material. Like, when there is info on the screen that isn't really relevant, you make sure to mention it and give a very brief explanation so that students don't get distracted wondering about it. I very much appreciate this. 👍

[@rupanshisrivastava6413]

Passed my CCNA exam on 31st October, You are doing really an excellent work. I videos are planned in such a systematic way, that makes it so easy to learn and understand.

[@JeremysITLab]

Awesome, congrats! And thanks for the kind words about the course :)

[@Ned478]

did you need any other resources to pass? Anything in particular to study?

[@seanturner7511]

Feels like I hit a brick wall with this episode. When it got to the quiz portion I was so confused. I am rewatching now.

[@lorikmehmeti6777]

Hey bro! This reply might have come a little too late. If you passed through the wall, congrats on the CCNA! If you didn't let this reply be the reason to come back and go for it. Let's study together!

[@seanturner7511]

@lorikmehmeti6777 Thanks man! I just passed last Saturday. It was a nail-biter! I rewatched a lot on 1.5 speed and did the exsim exams. Test was hard! But definitely passable.

[@lorikmehmeti6777]

@@seanturner7511 That's so motivating to hear. Congrats once again. Any tips and tricks that can be useful?

[@bryanlemley9787]

Can someone explain why SW2 Fa1/0 and Fa2/0 are DPs? Do they not have the same root cost as SW1 Fa2/0 and Fa1/0?

[@1234511836]

@@bryanlemley9787 SW2 Fa1/0 and Fa2/0 are DPs because between SW2 and SW1, SW2 has a lower BridgeID. If you look at the MAC address on SW2 014A.3821 is lower than SW1 014A.38F1. Therefore, the ports on SW2 become DPs. In a sense SW2 is closer to SW4 which is the Root bridge (Anybody in the comments correct me if i am wrong) =)

[@ndagireoliver4078]

i watched this video and took down notes of every single word Jeremy said. 12 pages in total! It's taken me 4 hours to understand.I could do every quiz qn on my own. Am happy it's been worth it.

[@KamranAli-ml3vv]

I am attending one online CCNA class, i came here to clarify some points and am so impressed by your way of explanation and delivering the knowledge. Please keep helping and spreading knowledge. May God bless you

[@JeremysITLab]

Thank you, I'm glad my videos are helpful :)

[@swimprodigy87]

One of my favorite videos in the series by far. STP is a one of the harder protocols to grasp, but you break things down in an easy to understand way. Learned a lot in this one. Thanks Jeremy.

[@-b777ljq3]

very good lecture. So far it's the most difficult one among all previous videos, I watched twice and finally understood it, many thanks to Jeremy.

[@khamisnaaman5443]

I've watched three different videos for more than three day... Atleast this is the one I've understood.

[@MrReklez]

same here mate

[@HemanthJabalpuri]

First time, I struggled to understand STP from this video (maybe because of my English) At 22:45 Jeremy said "You don't count the cost of receiving interface, just the sending(outgoing) interface" To calculate cost of interfaces of SW2 (22:45), we have to add the costs of outgoing ports to reach root bridge (SW1 in this case) - via G0/1 it is 4 (since it is only the outgoing interface to reach SW1) - via G0/0 it is 8 (cost of SW2 G0/0 + cost of SW3 G/0) Since via G0/0 the cost the low, it will become root port. I think this makes better understanding. Don't forget to watch the lab video, since it shows this calculation clearly.

[@HemanthJabalpuri]

At 25:22 First let's try to calculate cost of SW1's interfaces - via G0/0 it is 4 (since G0/0 is only outgoing interface to reach root bridge-SW2) - via G0/1 it is 12 (cost of SW1 G0/1 + cost of SW3 G0/1 + cost of SW4 G0/1) Clearly G0/0 won and it is root port. Now, let's try with SW3 - via G0/0 it is 8 (cost of SW3 G0/0 + cost of SW1 G0/0) - via G0/1 it is 8 (cost of SW3 G0/1 + cost of SW4 G0/1) Since both are equal, we compare the 1st neighbor switch of both the interfaces - via G0/0, SW1 is neighbor with BridgeID 32769.014A.38F1.BA81 - via G0/1, SW4 is neighbor with BridgeID 32769.83F1.2846.392F Here, SW1's BridgeID is lower. So G0/0 will become root port

[@Manu-rd4pc]

Thanks again. What gets me confused is the cost of "0"

[@HemanthJabalpuri]

@@Manu-rd4pc It's just to advertise via BPDU. We can calculate costs by seeing network diagram, but real switches can't do that. They have to see the information in BPDU received. When a BPDU with 0 cost is received, it can confirm that root bridge is directly connected to it without any intermediate switches.

[@Manu-rd4pc]

@@HemanthJabalpuri Thanks again. That's clearer now 👍

[@bunny.bunbob]

Your approach Looks at the calculation from the opposite direction, compared to Jeremy. Jeremys explanation doesnt make any Sense at this Point. Between sw1 and sw2 only sw1 g0/0 is a sending Interface, so it should have a cost of 4. Jeremys graphics Shows 0 instead. Then in the explanation He writes that sw2 adds its own Interface cost. But why would it? Only sw1 was sending.

[@ernestibrahim7532]

I am very happy to come across this great Gentle Man. Sincerely appreciate your hard work. You wore my Golden Crown for 2020 and beyond.

[@JeremysITLab]

Thank you Ernest ;)

[@fereydoonsassani377]

It's really useful when you watch the whole series, then circle back to the earlier videos again. Definitely helps me understand all the little details more clearly.

[@JeremysITLab]

Yeah that's a good idea! You'll get more out of the material if you go over it again.

[@nblgus2595]

That's how I study , 😅 It works somehow

[@emadsaria6510]

To prevent loops from occurring in a network, the PortFast mode is supported only on nontrunking access ports because these ports typically do not transmit or receive BPDUs

[@JeremysITLab]

Yes, that's correct!

[@christianmella-sastre1615]

So it accesses ports only then for the answer!

[@crazybirdslover3140]

thanks a lot Jeremy, today i finished your videos and started reading the official cert guide to review some points i didn't understand at first. Root cost was one of them. i advice everyone to read Volume one from page 270 to 285 it's very well explained. thanks again for your effort

[@JeremysITLab]

I agree with your recommendation to read the official cert guide, it's extremely helpful!

[@CanadaUkraineGeorgia]

Learning CCNA, today is 08/20/24, hope that I'll pass it by the end of the year, GOOD LUCK TO EVERYONE!

[@FIREfreezerPR]

You got this! I recommend doing Jeremy's IT Lab all the way through, twice! That should definitely make you ready for the test.

[@bricksindustrialequipments2457]

Hurrah ! you're the best in teaching CCna so far in networking arena . Content + Clarity + Quality = Jeremy , Hay Jeremy you're just fucking awesome with your impeccable & top-notch noteworthy lectures .Though I'm a regular follower & I knew you're the best in teaching any topic in CCna . I felt like I'm unable to understand this Spanning 🌲 protocol concept since from morning .I have listened this once & twice and thrice , and in a confusion mode , I'm opted to other KZbin channels to get understand this .After a long search again , I have come back again to you and watched your video for 10 times which makes everything clear in classic spanning tree protocol so far. Thanks a million Jeremy , no doubt you're the best so far in teaching any CCna networking concepts . Alas ! I bet you all , Jeremy cioara , Keith Barker and network Chuck . They are just good for nothing & barking like a bla bla bla !!!

[@JeremysITLab]

Thank you so much ;) Those other teachers are very good and knowledgeable! But different people like different teachers :)

[@adamlovescats]

10minutes in you simplified a concept that i couldnt understand nor in class or with other videos, thank you

[@JeremysITLab]

Nice, I'm glad my video helped :)

[@phoenix86]

I love that you show and explain the bridge priority using binary bits. Most CCNA STP materials that I've seen just throw the numbers at you and expect us to memorize with no rhyme or reason: "Bridge priority can only be increments of 4096 just because!"

[@lukembogo]

Am back to learning Cisco. Thanks to JEREMY. I've just got your contents, Super explanations. I want to go through your videos for 30 Days then register for an online certification. Impressive job Sir

[@JeremysITLab]

Good luck! My course is only about 50% finished at the moment, so if you want to take the CCNA exam soon you should use another course, too!

[@Vishnu-xp9me]

32:14 , 2 ) II lowest neighbour bridge id . then bridge id = bridge priority + mac , if one fail and then other , using same logic for 30:45, but in quiz 5 . basically if using bridge id mean use priority or mac if one fail . but you are skip any one .

[@glenntembo2693]

Thanks J (lowest neighbour ID) - from zero to hero with J'sIT-Lab

[@JeremysITLab]

Thanks Glenn 👍

[@chantellemorehead9390]

Thank you so much for making STP so understandable. You taught me more in the few videos than a whole semester in college

[@JeremysITLab]

Awesome! Glad to hear that :)

[@mattd03411]

College seems to not teach anyone anything anymore besides how to join the democrat cult. Too many people with degrees and zero know how. Forget that bill! I am here re-certing and this is a really well thought out video. So I 2nd that thanks.

[@amiraljrah1584]

no word can describe how thankful we are

[@JeremysITLab]

Thank you :)

[@DuongDavinc]

With my poor English, I had to watch the video 3 times to understand tks you, motivational person

[@alexeygaas5893]

Thanks a lot! When more and more new information was appearing, I thought I won't understand anything and will re-watch full video again and again, but not, you explanation is so clear to understand the first time

[@JeremysITLab]

Thank you, I'm glad to hear that :)

[@albertopineda462]

ADDITIONAL INFO: There are BIAs for each interface in a switch. The MAC address used by the STP in the election is the switch's base ethernet MAC address which is shown using the command: show version.

[@justfahmi6948]

Thanks

[@wwolfram33]

The information in this video is fantastic. Well done Jeremy. I had STP questions that were not clear in the CCNA book/course. This video greatly help clear some STP concepts up for me. Keep it up!

[@odrommouniengue2645]

i`m chris from cape town, south africa...your videos are helping me to understand my N+ courses and ccna . thank you. God bless your work

[@Malaikahkhan]

best instructor out there, your content is amazing. Great work Jeremy

[@JeremysITLab]

Thank you! :)

[@وحیاللهاسدی]

Hi dear Jeremy! I am grateful to follow your course and I thin the answer of last question is C: all access port

[@rolan2dr]

Just passed my CCNA! Thank you so much for your content!!! Amazing resource.

[@JeremysITLab]

Wow, congrats! Although my course isn't complete, I'm glad you like it :)

[@rolan2dr]

I actually started with your videos did all your labs. Supplemented with Wendell Odom Cert guide, and watched Kevin Wallace course. Finally, did Boson practice tests.

[@shujaatmirza41]

How was the Exam? Hard or Just Fine? your contribution would be great!

[@Benardk4]

Jeremy's IT Lab is the course complete now?

[@firminorules]

Congrats!

[@claw172000]

Thank you so much for this explanation Jeremy. Until now i wasn't able to understand this concept very well. Never stop teaching, you are a natural !!!

[@antonioraffa7475]

Hi Jeremy, thank you for all your videos. I think that at 35:00 SW1's F1/0 and F2/0 interfaces are non-designated beacause SW2 has a lower bridge ID and not a lower root cost, which should be exactly the same. Is it correct? Almost for the same reason, at 34:02, the designated interface should be SW2's G0/0 and not SW4's G0/1, or am I totally wrong? I didn't understand the root cost, but now I've seen again the video and it's clearer. Thank you very much!😄

[@bigwillie404]

No I don't think you're wrong on this. This caused me to question my understanding of spanning tree while I was refreshing.

[@HardeepSingh-gy3em]

Hi Jeremy, kindly refer to 5:18-5:42-6:00 on the video. "When SW 1 receives the frame..... it will flooded at all interfaces , except the one it was received on" I don't understand what it means , "except the one it was received on".

[@JeremysITLab]

For example at 5:18, SW1 receives a frame from PC1 and then floods the frame. However it doesn't flood it out of the interface connected to PC1, because it received the frame on that interface.

[@HardeepSingh-gy3em]

@@JeremysITLab Thanks Jeremy for your reply. See following statement. "Broadcast and multicast traffic is forwarded out to every port, apart from the port on which the traffic arrived". I hope the above is similar to your explanation. Source: www.guru99.com/stp-spanning-tree-protocol-examples.html

[@rotrose7531]

Thank you very much, Finally I begin to understand the concept of spanning tree. Thanks a lot!!

[@JeremysITLab]

Glad to hear that :)

[@Flying_turnip187]

I have to say this is a great thing you are doing Jeremy! I tried a couple other places to learnthe CCNA and those didnt work. Tried the test and failed. Trying again with your videos. I am connecting with your easy to learn teaching style and easy to understand lessons. I am gonna pass the next time around! Thank you!

[@JeremysITLab]

Thanks JaYu :)

[@OxTongue0]

Thanks Jeremy. For all the videos in this playlist They are so useful You made it look so easy to understand with your slides and explanation Keep up the good work

[@JeremysITLab]

Thank you :)

[@TheBobFish]

Man, what's crazy is I've taken many CCNA boot camps without the intent of testing. I'm in the Air Force and get free training since I'm in a enterprise IT networking position. I don't know if it's because I never put as much effort in or if past courses simply were ineffective, but I remember struggling to grasp the port role process. I had zero issues getting the correct answers on any of your quizzes after this lecture. Well done and thank you.

[@mojbr704]

Oh this is a lot of information, I need to watch it again 😅 thank you Jeremy

[@JeremysITLab]

Spanning tree is an important topic, so take your time to learn it! No rush

[@ObaDayo]

This has to be one of your best videos. Learnt everything as I was taking notes throughout and hardly forgot a thing. Absolutely amazing explanations.

[@giorgioamato6176]

Hi all, minute 34:10, why is not SW2 G0/0 the designated port? As far as I understand the root path cost from that interface is 8 (4+4) while the root path cost from SW4 G0/1 is 12 (4+4+4). Can anyone clarify that? Thanks

[@knaulzz]

Bruh I’m on the same page I need clarification

[@Azimnazmi7]

I'm sure you've already figured it out, but i'll try to explain. For electing which port is designated port between SW2 & SW4, we're looking for port from switch that has the LOWEST root cost among its interfaces. So, for SW2, G0/0's root cost is 8, G0/1 & G0/2's root cost are also 8, so the lowest root cost for SW2 among its interfaces is 8. For SW4, G0/0 has 4 root cost, and G0/1 has 12 root cost, so the lowest root cost for SW4 among its interfaces is 4. So, 4 (lowest root cost of SW4) is smaller than 12 (lowest root cost of SW2), then the designated port will be port from SW4, which its G0/1 interface. I'm still learning as i go btw, but i hope this helps!

[@ItayKhn]

I swear I finished Netacad with a lecturer and your level of explanation is far beyond, I could see now things that I couldn't.

[@jonathansanchez7010]

Tus explicaciones son muy buenas, a pesar que mi nivel de ingles es básico, se entiende muy bien. Thank you Jeremy for your explanatory videos!

[@Nxtfbrdf]

3 years ago I wa studying computer science in school,but I hated Netwroking,now I have fallen in love with it,Thank you Jeremy.

[@onewaydrive_]

oof im gunna have to go back over this one a few times. I was good up until the end there lol thanks jeremy!

[@JeremysITLab]

No rush, take your time to absorb it all ;)

[@paulpark9824]

I read OGC I & II cover to cover, and I have to say watching these videos is more efficient and effective, while also being way less strenuous. Same material and concepts, but somehow Jeremy presents things in a way that is far more comprehensible to novices. I did learn a lot from OGC, but boy did I pay a price. At times I would get confused and bewildered, resulting in the whipping and gnashing of teeth; brimstone emanating from my nostrils. Never happens with Jeremy's labs or lessons. I Just sit back, relax, and learn.

[@sankofacloudworks]

I've been studying the OCG also but now I fall asleep listening to Jeremy's IT lab and sometimes I can hear him talking CCNA talk in my dream....lmao

[@josephnduati1214]

Gold found Guys, gold found! Thank you Sir!

[@user-wv1bi6mc1p]

I have watched this one more than 4 times, and finally, I understand it throughly. Thank you so much.

[@potatobits7997]

Hi Jeremy, I am confused with "you don't count the cost of the receiving interface, just the sending/outgoing interface" at 22:48.. but then at 23:30 you said that SW2 g0/0 was advertised a cost of 4 from SW3 and you added it to 4 on its g0/0 = 8.. isn't the advertised 4 from SW3 is a receiving for SW2? yet you said not to count receiving interface.. please help me to clarify my thoughts.. Thank you

[@FarhadHosan043]

Brother from sw2 all three port has cost 8. So you have to compare sw1 and sw4 mac address because Pri same so in this case sw1 mac address is lower so g0/2 port on sw3 is root port and other is designated port on sw1. And other 2 port is non designated port.

[@roger6nelson]

11:50 sec...a simple statement of clarity that I looked through several Google searches, STP vids on KZbin, 2 Udemy courses and the Cisco cert guide, and there I find the tiny nugget that gave me the clarity I needed (Only switches use STP between other switches)...thank you

[@JeremysITLab]

Only switches use STP, but they will use it even on interfaces connected to other devices such as routers and PCs!

[@roger6nelson]

@@JeremysITLab Interesting, do you clarify in one of the STP videos? I’ve only watched this one so far.

[@JeremysITLab]

@@roger6nelson Well I state it in the slide at 11:50...Switches send BPDUs out of all interfaces, but routers, PCs, etc do not send BPDUs.

[@roger6nelson]

@@JeremysITLab What’s your preferred method of donation?

[@roger6nelson]

@@JeremysITLab no worries, I added your course on Teachable

[@scottmcarthur7496]

this is not an easy concept to understand at all, but you do a good job of it jeremy, CCNA is not to be taken lightly, i never understand how this is entry level certification!

[@biz20072008]

Some people teach in order to show people how great a knowledge they have and this confuses the Sh*t out of the audience. You genuinely want to pass knowledge to your audience and I commend you for that. AH-MAZING!

[@JeremysITLab]

Thank you, glad to hear that :)

[@maxwellchessdotcom6952]

The picture in the top right was taken after Jeremy implemented STP on his network.

[@mateisergiu7495]

This is the best explanation that i saw of STP protocol,everything is put on step by step,amazing...i have searched for this explanation for years,thank you a lot!!

[@iftihajhossain]

Hi @jeremy, can you please explain a bit more how you calculate SW2 int g0/1 and g0/0 root cost (Quiz 5 Non-Designation port part) ? I mean how they have higher root cost ? Would be good if you go for Quiz 6 also, (just for Non-Designation port part with peer SW Root cost). Thanks in advance.

[@kavissenmurday7029]

I am having the same question in my head, sir. Could someone explain this would be wonderful?

[@BankiHorvathGyorgy]

Same question for me. As for the remaining ports between SW2 and SW4, the designated port should be SW2.G0/0, whereas SW4’s G0/2 should be the ND port, because SW2 has lower MAC Address.

[@kavianrowghani5085]

@@kavissenmurday7029 SW2's G0/0, G0/1, and G0/2 all have a root cost of 8 (in the case of SW2'S G0/1 and G0/2: 4 from SW1's G0/1 and 4 from themselves. In the case of SW2's G0/0: 4 from SW4's G0/0 and 4 from itself.) Since all SW2's interfaces have the same root cost, the next tiebreak is to calculate the root cost from the lowest neighbor bridge id. Remember lowest bridge ID (BID) is a concatination of bridge priority plus MAC address. We can see that SW1 has the lowest neighbor BID. But SW2's G0/1 and G0/2 are tied here again. So, the next tiebreak is to calculate the lowest neighbor port ID. between SW2's G0/1 and G0/2, G0/2 has the lowest neighbor port ID: SW1's G0/0. Therefore, SW2's G0/2 is chosen as the root port. I hope this helps!

[@kavianrowghani5085]

@@BankiHorvathGyorgy Hi Banki, I'm not sure which Quiz example you are referring to. In Quiz 5, SW4 does not have a G0/2 port. In Quiz 6, SW4 was elected as the root bridge and therefore, all its ports are designated ports. Hope that helps. Please reply and clarify and I would be happy to help further.

[@kavianrowghani5085]

Please see my comments below. For some reason I can't @ you

[@aruizsilva]

Complicated issue today. You are a gifted teacher. Thanks very much for your help!!

[@Brian-nz6ns]

So when determining the Root Port you only consider the root cost of each specific interface but when determining the root cost of individual collision domains you add the root cost for the entire switch?

[@JeremysITLab]

That's correct. The switch wants to select the best interface to be the root port, so it compares the root cost of each interface. When deciding which side of the connection will be designated in a collision domain, the switches compare their root costs (=their cost via their root port)

[@Volmire1]

@@JeremysITLab Thanks, that cleared up the question I had.

[@CurrencyCrafting]

What do you mean the root cost of individual collision domains?

[@suneye6782]

Thank you Jeremy for your incredible effort to make it easy for us. Just i want to add a small thing . in 32:08 (part #1) if you add how we will select the lowest bridge ID it will be nice. we learn from you that The Bridge Priority is compared first. If they tie, the MAC address is then compared.

[@hixonke1]

Hello Jeremy. I’ve said in other videos and I’ll say it again, thank you for the great videos! I have a question on this one on the quiz section that’s got me stumped. At times stamp 34:09 you say Switch 1s G0/2 is DP and SW2s G0/1 is non. I’m not making the connection. Wouldn’t the root cost on Sw 2 be 8 while the cost on SW 1 be 12, therefore making the roles be reversed on these ports? This is my first attempt on STP so I’m sure it probably something I’m missing, but…. Thanks in advance! Adding this edit after my post above…. Same on SW4 G0/1 and SW2 G0/0. I came up with reversed roles on the ports. My thinking is this: from sw4 you leave port G0/1 cost of 4. Leave switch 2 another cost of 4. Finally leave sw 3 another cost of 4 to get to root, which is a total cost of 12. Then from sw 2 you leave port G0/0 for a cost of 4. Out sw 4 for another cost of 4 to root for a total cost of 8.

[@JeremysITLab]

To select the Designated/Non-Designated ports, you compare the root cost of the switches, not the root cost of the ports you are deciding the roles of. Notice I stated 'Interface on switch with lowest root cost' becomes Designated, not 'interface with lowest root cost' becomes designated. SW1's root cost is 4, SW2's root cost is 8, and SW4's root cost is 4. SW2 has a higher root cost than the others, so its ports become Non-Designated.

[@hixonke1]

Man I totally missed that detail, but just added it to my notes. Understood now. Thank you so much for clarity and such a quick response.

[@JeremysITLab]

@@hixonke1 No problem! Thanks for the tip via PayPal Keith, I really appreciate it :)

[@meliadas7725]

@@JeremysITLab I get it now, it's so clear ! i was confused, tunneling vision on the interface making useless calcul instead of just "listening". I take the switch's root port and just go to root bridge then i have my cost number and the lowest one would be designated ! Thank you !

[@CraftnCrest]

Never before did not waited for any youtube notification. Now i have broke down my record. you are mentor .please upload your next video

[@JeremysITLab]

I'm glad you like the videos ;) Next one will be up tomorrow!

[@scottmcarthur7496]

this is the hardest part of the course so far

[@joksyzm]

Quiz 5. 34:08 Why are those interfaces elected through root cost when all interfaces are connected with Gigibit connection?

[@JeremysITLab]

The switch's root cost is used to determine which interfaces are elected, not the root cost of each individual interface.

[@prashantkiratkar.5747]

Are both the Designated port & the Root port in the forwarding state? Then what's the difference?

[@JeremysITLab]

The root port guarantees a path to the root bridge, the designated port does not (the port across from the designated port could be blocked).

[@prashantkiratkar.5747]

@@JeremysITLab Thanks Jeremy.

[@kimdahlgren697]

Had to watch the video 2 times to wrap the consept around my head. But as allways, very well explained, and I dont think you could had made it easier to understand. Thank you again :)

[@JeremysITLab]

Thanks, Kim!

[@yasiryousuf2344]

I have been following your series and found very informative you are doing great. My question is in Quiz 5 SW4 interface G0/1 should be non designated port instead of SW2 interface G0/0 because both costs are same and SW2 bridge ID is lower, please explain.

[@JeremysITLab]

SW4 has a root cost of 4 (via its G0/0 interface) SW2 has a root cost of 8 (via its G0/2 interface + SW1's G0/1 interface) SW4 has the lower root cost, so its interface becomes designated. Look at 32:00 in the video, I said the 'interface on the switch with the lowest root cost' will be designated, so that's why SW4's interface becomes designated. Let me know if you have any more questions :)

[@yasiryousuf2344]

@@JeremysITLabMy confusion has cleared, thanks a lot sir.

[@winha4555]

I got confused too, and after 30 minutes searching with no solution I've found your comment. Thanks both of u

[@VinnydaNetEngineer]

Boson answer:C Portfast is enabled on end user devices such as PCs. When a NIC becomes active upon boot, PortFast will forward traffic immediately. This is used on access ports.

[@LucianC137]

the opposite side of the root port is always designated right?

[@JeremysITLab]

Correct! The root port's role is to provide a path to the root bridge, so the opposite side must be designated (forwarding). If it's blocking it can't provide the path to the root.

[@mosasa1307]

@31:07 "The switch with the lowest root cost will make its port designated". Jeremy you said that both switches (Sw2 & 3) have the same root cost. I thought the root cost was calculated by the outgoing port and the speed of the port. So in this case, SW3 should have a root cost of 8 from the perspective of SW2.

[@JeremysITLab]

SW2's root cost is 4: it's directly connected to the root bridge. Same for SW3: it's directly connected to the root bridge. We aren't comparing SW2 G0/0 vs SW3 G0/1, we are comparing SW2 vs SW3.

[@moeqwaqanah9550]

Great efforts! Thank you very much I just want to ask , what is the estimated time for finishing this course ?

[@JeremysITLab]

I think I will finish it around the end of this year.

[@adelcazevo5272]

This lesson for me, is more difficult to understand, but you teached very good, because that now i know very well that lesson about STP, thank you very much for it, you are the best CCNA teacher of the world.

[@aaronhuang8425]

Jeremy, my brother and I started your CCNA program on Monday of this week. My brother and I are on Day 4 today. So far, we really enjoy your layout and information. You do a very good job explaining the information in direct and understandable fashion! If you don't mind me asking, how many "Days" do you anticipate you're going to post for the complete CCNA 200-301 course? Due to financial hardship, my brother and I have not downloaded Boson yet. Is it possible to simply go thru your course and pass the CCNA or would you recommend purchasing the Boson practice exams and Boson practice labs in addition to your course? We've been mainly using the Packet Tracer, using Anki, and watching/studying your videos as of right now.

[@JeremysITLab]

Thanks for the comment, I'm glad you and your brother are liking the series :) I guess it will be up to 50 days in total, there's still a lot to cover. You don't NEED the Boson products to pass, but they are definitely helpful. If you're going to get just one, get the practice exams after you have studied all the exam topics, to help you prepare before taking the real thing. It's $99, but it could save you from having to retake the exam if you fail, which is much more expensive.

[@kelecortez5834]

@@JeremysITLab YES !!!! buy Boson exams . I did & they are great. Super glad I purchased it

[@dmitrikazantsev3692]

Thanks Jeremy, well done, man. it's Day 20, and I keep moving along your series...

[@thobekilealicendlovu3578]

I found this video difficult

[@Rasukutty777]

Yes

[@BrotherYarmoth]

Great video as always. Had to watch it a billion times before I was able to answer the quizzes correctly. For the Boson answer (I bought the practices tests by the way. Boson is AWESOME!) I'm going to say A. Because portfast can only be enabled port by port and not globally/all at the same time.

[@fritzdamiendengambog9169]

Bro I go through many explications of this elections stuff.even with the goats Imran video I wasn't able to clearly understand.But this video made it very clear.in fact before you I already had many other ressources for my CCNA.but went I am stuck in some stuff,I just refer to your video and I am always satisfied thanks bro.

[@JeremysITLab]

Thanks for your kind words :)

[@innocentchigwende805]

Could you please check 34:14 Quiz 5, between SW2 (G0/0) and SW4(G0/1), from the rules I think SW2 (G0/0) is supposed to be Designated port not the other way around. This is because it is on a switch with the lowest Bridge ID

[@nehalali7857]

yeah I also figured this out

[@Sparkkllleee]

In the selection process of designated and non designated ports the root cost comes first then the lowest bridge Id So the switch with the lowest root cost would be designated And if the root cost is a tie then the lowest bridge Id is used for the selection

[@wonkyboymakesstuff]

Genuinely thank you for this video. Such a tough topic to grasp but you did an incredible job

[@Dreambig6636]

started again after 4 months gap but love the way u taught everything Hats of

[@98009252]

awesome sir ur the borer and driller u wonderfully bore and drill to the root of every concepts made so simple hatsoff ,none explained so till date in the online i have searched so far, thankyou

[@syedyousafbukhari2213]

35:10 i don't get how Sw2 has lower root cost, than sw1 because if they both has double connection with FA then it must be 19 outgoing for both, no?

[@kamilovicftw6810]

So, i made it to this point. 17.09.2021 is may exam day. I hope i will finish all vidoes in the next 2-3 weeks. Last week will be review week. Im also beeing in a "CCNA prep" class, and i work with supplementary stuff like anki, and a book. Greetings from germany.

[@allans.9754]

Your videos rock! Thank you, Jeremy. We appreciate the time you take to teach us networking.

[@edwinsenas7169]

Mr. Jeremy thank you very much for sharing your knowledge to us and all your efforts and hard work. may God bless you more.....

[@JeremysITLab]

Thank you :)

[@tsehayeredae7730]

You're number 1 trainer, and thank you so much for all the lessons

[@vernerheisenberg8900]

All good?! NO! Actually, NOT ALL GOOD! That was just pure gold!

[@Fink87]

3:54 can be obviated in an enterprise setting by providing two wall ports at an end users device, which goto two different access switches in the comms room, therefore if one switch goes down, users can plug their cable into the other port.

[@boots7859]

You have no clue how expensive that would be in an enterprise or even average sized businesses...

[@Fink87]

@@boots7859 Im not a financial advisor, just providing an alternative solution, that we certainly employ.

[@Fink87]

@@boots7859 Im well aware of how expensive it would be - the fact remains the same as two years ago when I posted that, it can be used to avoid the scenario. At no point was cost mentioned, are we going to pull up everything in these videos and determine the cost to a business? Why even bother having L3 switches, since they would cost more. What a daft statement to make.

[@jacoswart4886]

Thank you for a very insightful explanation on STP. Just a quick question. How does SW3 know what the port priority is of ports on another switch. Time Index 28:38

[@marks5850]

Hey Jeremy, thanks for a great presentation! You're not rushing. Great job.

[@yoriichiT]

I'm confused at 9:06 you said that interfaces in a blocking state send and receive bpdu But when i googled it i found out that it only receive bpdu Am i missing something?

[@kumarpriyank44]

Finally wait is over. Got a notification of new upload and thats jeremyyyyy ... 😁😁.

[@JeremysITLab]

Glad you like the videos ;)

[@ericksonloyola6993]

now i understand it a little, we need to plot the flow of root cost first from the root bridge. before we determine who has the interface with the least root cost per switch.

[@magedashraf2053]

Wow, i thought i will never understand it !! you are incredible !! :")))

[@clancynick]

Thanks!