Free CCNA | OSPF Part 2 | Day 27 | CCNA 200-301 Complete Course

[@ghwang8335]

If anyone finds this helpful, my Cisco teacher used "Demons In Texas Eat Eels Like Fries" to help my class remember the order of the ospf states

[@JeremysITLab]

Haha, I like it

[@Kisnowar]

Hey, that's pretty good. I almost got it after the first time. I'd pin it.

[@02stampede]

That's perfect! The more ridiculous it sounds, the more likely you are to remember.

[@c7po457]

Thanks! This is really helpful. I learned it on the first try!

[@Smithy_7895]

For some reason this seems to help it stick - Thanks

[@kevinhayes1202]

Here i am wishing i had discovered these videos before i took my exam. So finely detailed and precise in presentation. I feel like i have fallen, then woken up with a massive light bulb on in my brain. You have a genuine gift for teaching.

[@JeremysITLab]

Thanks for the kind words, Kevin! And thanks for being a channel member :)

[@JeremysITLab]

ERRATA: At 4:57, I said 'The 100 megabits per second I configured as the reference bandwidth...' . It should be *100,000* megabits per second (or 100 *gigabits* per second). At 6:44, it should be '100 ( R1 *G0/0* ) + 1 (R2 L0) = 101', NOT '100 (R1 *G1/0* ) + 1 (R2 L0) = 101' At 31:10, the command should be 'auto-cost reference-bandwidth'. There is a missing hyphen.

[@WhoData5816]

Hi, am one of your great fan, and I sincerely appreciate your effort. Am preparing for my ccna 201-300 exam by November's and I only depend on your source. please can you recommend me another source because it seems your's is not going to complete soon

[@SakshiKumari-lc5wb]

@@WhoData5816 Udemy course of neil anderson. Boson Net sim exam

[@mohanshetty4474]

I have unsolved network topology so So can u plz share ur email I'd I will send it to u Can u plz help me out sir

[@KimchiJoahaeyo]

You should pin this comment.

[@redddboy]

Jeremy, I just want to thank you for your time and efforts in making this video series for the CCNA. You explain things very well. Now that I'm all caught up, I'm looking forward to every Sunday when you release a new course video. You are a rock star sir!!! :)

[@JeremysITLab]

Thank you, Christopher :)

[@moienanwari]

I don't know how to thank you, Jeremy, I started this course with 0 knowledge but now I completely understand everything, thank you so much . wish you good luck and long-lasting life,

[@StuartTufft]

I'm still going with the course Jeremy! My exam is booked in too. A cool thing I noticed today is that the captions on these videos are extremely accurate.

[@JeremysITLab]

When's it booked for? Good luck! These videos are all scripted so I just upload the script and KZbin does the timings for me, it's quite easy :)

[@StuartTufft]

@@JeremysITLab July 5th. I've been conservative with the time I've allowed myself but I'm feeling good about it. I'm doing a few sections at a time and then consolidating the information by re-running the labs. Sometimes the captions help me concentrate more and I imagine they're great for none native English speakers.

[@nelsoncorreia7293]

@@JeremysITLab I second this. very grateful for your captions.

[@markobarbaric7434]

Jeremy you’re doing a great job, made it look easy! btw : The following fields in the OSPF Hello packets must be the same on both routers in order for routers to become neighbors: subnet, area id, hello and dead interval timers, authentication, area stub flag and MTU. I think that it is important to know for CCNA.

[@JeremysITLab]

Thanks! All of that is in the OSPF part 3 video ;) (except for stub area flag, you don't really need to learn stub areas for CCNA I think)

[@Andrew-mk5yw]

I took the cisco academy course In college and found that these videos by far exceed any book cisco has published. The way you are able to describe the 7 states for ospf is amazing. Thanks so much jeremy.

[@jhilmarmolina2691]

This Monday pass the CCNA! I am really excited. Your videos helped me a lot. Thank you very much Jeremys!

[@JeremysITLab]

That's awesome Jhilmar! CCNA is a very tough exam so I'm sure you studied very hard! Good job ;)

[@sheru9229]

What resources did u use to Pass the exam plz?

[@TheGamingChannel100]

@@sheru9229 I plan on using the official cert guide by Wendell Odom on top of Jeremy's course, should be more than enough to pass. Also make sure to do the flashcards and labs daily, best way to preserve knowledge and memorize the ios commands.. www.ciscopress.com/store/ccna-200-301-official-cert-guide-volume-1-9780135792735 www.ciscopress.com/store/ccna-200-301-official-cert-guide-volume-2-premium-edition-9780135262719

[@dobly21]

I am following the Neils Cisco CCNA boot camp in order to continue with my studies and be able to present my test in November this year. But I will happily pay for a full course dictated by you. an awesome job with the videos and amazingly easy to understand the topics.

[@JeremysITLab]

Thank you, I'm glad to hear that! Once I finish up these videos I might add some extra labs etc and package them as a full course.

[@agnivbanerjee7001]

You know what's the best part, your clinical execution in making your video understandable and more logic, keep I the good work, I'm a ccna 201-300 aspirant, already been working under an isp company , role network technician

[@parker73724]

Here's an important note for anyone watching this course in the modern day. Cisco changed their language recently to be less controversial. This means that words like blacklist/whitelist master/slave have changed in the official terminology. Master and slave is now primary/secondary or primary/subordinate and whitelist/blacklist is permit (list)/block (list) or allow (list)/block (list). This is important to know for the test and is listed on Cisco's website under their Inclusive Language Policy.

[@aniswlidi2012]

This is the best explanation of the OSPF neighbour. Very appreciated.

[@JeremysITLab]

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

[@adesesanadelekan9219]

Thank you, Jeremy, for this video, my piece is that, even while am planning to re-certify the CCNA some topics might still be difficult, however, this should not be a showstopper as we can still carry on and book for the exam, am sure not everything will be clear at once, we need to be on the project, do more practice labs...read more OSPF, Etherchannel, subnetting, we figure the rest out along the line.

[@ATFofficial.]

That boson question today was excellent, did a wonderful way highlighting how routers choose paths

[@sumondas478]

ERRATA: At 6:41 100(R1 G1/0) + 1 (R2 L0) = 101 it should be 100(R1 G0/0) + 1 (R2 L0) = 101. That means the R1's exit interface is G0/0 not G1/0. By the way, thanks for the great content @Jeremy ✌️❤️

[@jzero1579]

It amazes me how you know all this information.

[@JeremysITLab]

I do a lot of review and take notes before making these videos!

[@AmirBanaee]

Dear Jeremy, thank you very much for all your efforts in providing such a great tutorial. Please note that in quiz 4 of this lesson, there is a mistake in the correct answer, "reference-bandwidth" is the correct form.

[@emirhanerdogu4656]

I'm in the last video. I finished by taking notes. very useful content thank you.CCNA for my exam preparation

[@JeremysITLab]

Thanks Emirhan, glad you like the videos! The course isn't complete yet, so I will continue to release a new video every week ;)

[@gonzalodiezpuebla381]

What a lecture. So nice Jeremy!! Please keep going on the CCNP course, this is my next course after the CCNA.

[@michaelgodwin7702]

Why did we say that to reach R2's L0 interface, it has to leave it? It doesn't have to leave it to reach it. Is it more of like just an added fee for going to a Loopback address inside a networking device?

[@AfikJones]

Did you ever find the answer for this? I don’t understand it either lolol

[@creedolala6918]

​@@AfikJonesmaybe the reasoning is that it tests if R2 is at least capable of sending stuff out the way it's supposed to, even if it doesn't actually have to go out. If you see that cost go up by one then you know that it's processing ospf correctly.

[@travelandexplorebd8962]

This is insane !!! how detailed way you can describe the thing beyond imagination.

[@konefine3626]

Thank you Jeremy for this explanation, there are too many questions about ospf more than the other routing protocol in all ExamSimulations I have , I am sure by the end of all ospf videos I would be bold to answer them correctly

[@JeremysITLab]

Yeah OSPF is a big part of the exam! I think over the 3 parts I made everything needed for the CCNA is covered ;)

[@bright6627]

Waiting for the whole lessions finished soon, then I can follow the CCNA exam . Thank you ,Jeremy.

[@JeremysITLab]

Thank you for your patience ;)

[@-b777ljq3]

very good lecture, thorough and clear, in depth, many thanks to Jeremy for the hard work.

[@AndreaMarrocco-yh4gg]

Hello Jeremy, i have 2 questions about the Exstart and Exchange State. 1) Why in the Exstart state the routers send a first DBD packet ? Is it to set like an initial counter from the next DBDs sent in the EXCHANGE state? 2) These DBDs are a unique packet in which first the Master and then the Slave send ALL the LSAs header descriptions or they send (in turn) multiple DBDs packets each with a single LSA? However i can't stop to thank you. You definitely need a statue in the centre of CISCO quarter.

[@mblackburn725]

Thanks for this wonderful class, great work so far. When do you plan on posting videos on NAT, ACLs and DHCP? Thanks again Jeremy

[@JeremysITLab]

Not sure about exactly when!

[@davestar6457]

Watched this video 3 times. Third time and the fog is starting to clear!

[@CH-vv2hr]

I am studying for a month maximum and then taking the Exam. I want to work in the cloud but I think a CCNA certification will look great on my resume, especially since I have no experience but hold CompTIA A+, Network+, and Security+ certs

[@DanielBotelho-ok8df]

On that boson question, its not specified the path we should use to calculate, so i just used the linear path RA-RE-RC for a cost of 11, i hope they are more precise with the questions on the exam.

[@MagicalStoriess]

your lectures are truly amazing Sir. simple, detailed, and accurate. Thank you for this amazing course..

[@lim9975]

I didn't know that OSPF can be enabled with the interface in CCNA Bootcamp or maybe I missed it. Thanks for the extra knowledge! Will keep watching your video although I had completed my CCNA test. Still thinking of getting a CCNP but it costs quite high for me.

[@JeremysITLab]

The 'network' command method is more common, but the interface method is quite convenient! Best of luck on the CCNP, it's a tough certification!

[@VeryBigBang13]

I'm still trying to say Router on a stick without laughing and now i learn there are Masters and Slaves Routers ? oh boy 😂

[@JeremysITLab]

Haha, 'master' and 'slave' are actually pretty common terms used in different areas of IT.

[@christianyaerger1751]

Don't kink shame. XD

[@VeryBigBang13]

😂😂

[@stevenjimenez9407]

Just great videos, but still had to repeat days 26-28 just to remember all the new commands and put them on the same page, as a recommendation could you put a list of all commands used on a given video? or something similar, I now this could be pushing more efforts on your part because you already make amazing videos, thanks for making this free.

[@RishiKumar-nz1tp]

At 6:44, in 5th point, I think it should be 100 (R1 G0/0) + 1 (R2 L0) = 101 !

[@JeremysITLab]

Indeed! You're right.

[@NETWizzJbirk]

I actually DO have 100 Gbps links on my network. They are on Cisco 9500 series /w QSFP28 transceivers using 100GBaseFR. I run two of them in LACP between a Firewall Rack and a Core.

[@markganus1085]

you start feeling down then you initiate your day on a 2-way street you go your ex starts a convo and u exchange info now you start loading her and you're full

[@mrdiamondsdv5847]

Wow, that's very creative and helpful way to remember this process, tyvm!

[@hammazahmed1289]

The names, master router and Slave router had me on the ground laughing xD Great Content!

[@groversahil]

Please make automation videos, as it has been introduced in syllabus of ccna 200-30. It's my huge request... Thank you for such useful videos,

[@JeremysITLab]

I plan to cover automation at the end of the course! :)

[@groversahil]

@@JeremysITLab ok, how long it takes to get that?

[@brooksamuel9632]

Thank you for this amazing lecture. you help me to understand the concept of network topology. Much gratitude!!!

[@muhannedbelaid8849]

Another video for this amazing learning journey, thank u Jeremy ^^

[@JeremysITLab]

Thanks Muhaned :)

[@muhannedbelaid8849]

@@JeremysITLab hello Jeremy. i just want to ask you a little question concerning the CCNA Gold Bootcamp for Neil , the price on his website is 99$ , but the price on UDEMY is almost 20$ ?? is it the same course with the same course content ? I hope u answer me . Regards.

[@ravishelke3581]

Jeremy ....the best so far.

[@empire_trad3ing]

Thank you mr jeremy ! When will your ccna course get fully completed ?

[@JeremysITLab]

Early next year, I think!

[@kugodx9]

Best teacher on the internet!

[@tithiram]

Hi Jeremy, This is an outstanding video series. I love it. Thank you so much...!!!

[@이동욱-k1g9l]

This is a question for CCNA. The network engineer is configuring OSPFv2 adjacency. Drag and drop parameters from the left to the required category on the right. All parameters are not used. Examples include netmask, ospf process ID, router ID, IP address, zone ID, timer ospf process ID, router ID, IP address must be unique. I think netmask, area ID and timer must match, is this answer correct? In the case of process ID, is it unique for each router??

[@JeremysITLab]

Wait for Day 28's video, I talk about the requirements for OSPF neighbors!

[@mariusavram7823]

Very interesting and practical! Thank you!

[@JeremysITLab]

Thank you Marius!

[@tg9460]

You are just awesome. Great tutorial. I have introduced your channel to some friends. Keep up the great work.

[@JeremysITLab]

Thank you for introducing my channel :)

[@DeepakKumar-ov8ko]

A great job! Please make video on ospf area types and lsa types.

[@JeremysITLab]

Thank you! Those topics aren't really necessary for the CCNA, so if I make a video about them it will be much later!

[@manuelringwald]

Hi all, maybe someone can help me understand this process step: During the neighboring process (step 3, "2-way"), both routers exchange theit RIDs. In the next state (step 4, "Exstart"), both Routers try to be the master using DBD packets. I don't understand why they need to negotiate master/slave in step 4 if R1 (RID: 1.1.1.1) already knows that R2 (RID: 2.2.2.2) has a higher ID from the previous step 3? Maybe I'm missing here something. Cheers! BTW: Jeremy, thank you for your great content!

[@alialiraqi2664]

same questions did you find an answer to it? it seems unlogical at first sight xD

[@alialiraqi2664]

might be new messages are sent to determined it?

[@kensliye94]

I was thinking that too, looks like waste of time and resources

[@maxwellchessdotcom6952]

Hello, I would like to welcome you to Jeremy's IT lab. Jeremy loves Cisco very much.

[@sergeinic1856]

12:43 - Jeremy, you said OSPF messages are encapsulated in IP header. I suppose more correct will be: "OSPF messages are encapsulated in IP packet". Not header.

[@umamaheshwari1081]

Thank you so much for making these amazing videos. You've explained all the concepts very well and in detail. You're certainly the best teacher! When will your CCNA course get fully completed?

[@nutboy93]

Someone asks this on every video I swear 😂 my guess is once a week till he hits about 60-70 in the playlist total

[@JeremysITLab]

Haha yes I answer this question about 5 times a day. I guess it will be finished early next year.

[@umamaheshwari1081]

@@nutboy93 Hahaha i know 😅 it's just that his videos are amazing and easy to understand. Eagerly waiting for the rest of his video lessons.

[@imjinaah]

0:01 Introduction 0:48 Things we'll cover ------------------------------------------------------------------------------------------- 1:40 OSPF Cost 4:02 Change Reference Bandwidth 7:42 Manually Configure OSPF cost of an interface 10:14 Summary ------------------------------------------------------------------------------------------- 11:07 OSPF Neighbors States 12:59 Down State 13:56 Init State 14:34 2-way State 15:55 Exstart State 17:12 Exchange State 17:52 Loading State 18:53 Full State 19:51 Summary ------------------------------------------------------------------------------------------- 20:11 Summary Chart of OSPF message types 22:33 OSPF Show commands 24:23 OSPF Configurations 26:28 Things we covered 28:22 Quiz!

[@JeremysITLab]

Cheers! :)

[@imjinaah]

@@JeremysITLab Happy Thanksgiving Jeremy! 😆 do they celebrate that in Japan? 🤣

[@Free-Palestine1960]

made a mistake @5:45 ?? Switch hes send BPDUs, which include the root path cost. This is the cost of the path from the sending switch to the root bridge. It is calculated by adding the individual port costs along the path from the switch to the root bridge. When a switch receives the BPDU, it adds the ingress port cost of the segment to determine its internal root path cost. It then advertises the new root path cost to its adjacent peers.

[@JeremysITLab]

Nope, not a mistake

[@nikpacara1]

Thank you for your videos Jeremy, they are very helpful. As you mention here 5:20 about changing the reference bandwidth on all OSPF routers in the network! Do you mean to change the reference bandwidth in the entire network or just into that area which those routers are a part off!

[@JeremysITLab]

Change it on all routers that are running OSPF

[@TimeNeverWaits95]

Jeremy is the coolest guy on earth ❤️

[@Jjoseph36]

Is there ever a situation where a router with the higher RID doesn’t become both DR and master at the two way state and Exstart respectively? The reason I asked is, why have two separate states when the later is basically decided by the former. Why not simply have a “two way exstart” state?

[@nicholassattaur9964]

Thanks Jeremy! Great content as always!...

[@JeremysITLab]

Thanks Nicholas!

[@sensesound1359]

Hej Jeremy thank you for the nice course :) . I would like to know if you will cover HSRP and ACLS in the near future?

[@JeremysITLab]

HSRP is coming up after OSPF Part 3, ACLs will be a little later in the course!

[@sensesound1359]

@@JeremysITLab Great than you!

[@sensesound1359]

@@JeremysITLab Great thank you! :) I have been trying other courses but you are the most pedagogic person of all of them, and I have learned a lot with your videos. Muchas Gracias!

[@freakkiller277]

It seems like the reference bandwidth is a flaw in the OSPF infrastructure. Is it that way due to lack of foresight? It doesn't make sense that a gigabit and 10gig link can be equally valued.

[@not2pro629]

When you are at the message type slide @ 22:27, are you talking about the different LSA message types?

[@spectrumanalyzer3093]

Another superb presentation. Very clear and concise as always.

[@ivagar1982]

Hi Jeremy, I hope you doing just fine For the following exhibit, how does the router manage traffic to 192.168.12.16? EIGRP: 192.168.12.0/24 RIP: 192.168.12.0/27 OSPF: 192.168.12.0/28 My answer would be RIP route. The OSPF has the longest prefix but it doesnt include the destination IP ad The Destination 192.168.12.16 would be subnet itself for the OSPF and the first ip ad would be 192.168.12.17 What is your thought about this? Thanks.

[@JeremysITLab]

Your answer is correct!

[@VISHALSINGH-hp7rr]

Nice Jeremy, your information is very useful

[@JeremysITLab]

Thanks Vishal :)

[@TSMusic-95]

praise be our lord and savior, channel failed to load

[@iamjoycheee]

I can't thank you enough everytime i finish watching each videos. You are a very great Sensei! Arigato Gozaimasu!

[@chris33006]

you didn't mention this on the lesson. but, What is a difference between speed command and the Bandwidth command for interface configurations?

[@JeremysITLab]

I'm not sure what you mean 'for interface configurations'. The command to configure the speed is 'speed' and the command to configure the bandwidth is 'bandwidth'.

[@umairm8595]

Thank you Jeremy this is very helpful.

[@JeremysITLab]

Thank you, glad to hear that 👍

[@admin_e]

Thank you. You are the best teacher

[@MosesRms]

plz what is the diffirence between the hello packet timer "10 second "and the LSA aging timer " 30 minute " ?

[@JeremysITLab]

Hello timer = how often the router sends OSPF hello packets LSA aging timer = how long the router keeps an OSPF LSA before discarding it and requesting it again from its neighbor

[@MosesRms]

@@JeremysITLab thank you a lot

[@yoddy0]

So thats why R4's default route had both routes in the routing table.

[@carlosenriquelopezperez7269]

hi, dear Jeremy, i was looking the ospf flashcards and in one card you made this question " OSPF DR/BDRs are elected in the "you select show answer" and the answer is " 2-WAY", and here in your video, you said the selection will be in Exstart state, mmm i think there's a mistake in the flashcard

[@JeremysITLab]

At 15:22 I state that the DR and BDR are elected in the 2-way state. Can you point out where I said it happens in the Exstart state?

[@ykrop002]

Thank you for another wonderful video

[@gerryvalenzuela9158]

about the References Bandwidth if you change it at global config mode is not recommended? instead you better change it in each interface it’s bandwidth value ?

[@JeremysITLab]

I think standard practice is to change it at global config mode

[@gerryvalenzuela9158]

@@JeremysITLab thx jeremy 🙏🏼

[@Alberto.81]

Thank you Jeremy! Great lesson as usual.

[@JeremysITLab]

Thanks Alberto! 👍

[@rr0ber4]

this might be too nitty gritty but you said R1 is first in the Down state, it sends a hello to R2 which puts R2 in the Init state, R2 sends a hello back putting both routers in the 2-way state, does that mean R1 (or whichever router initiates the hello) skips the Init state?

[@JeremysITLab]

Yep, depending on the order/timing of the packets you might see a router go straight to 2-way,

[@gerdnerd6704]

Very good! Thank you! Can' t wait for the next one!

[@JeremysITLab]

Thank you, next is coming on Sunday ;)

[@islamtoghuj]

Nice to see the like/dislike bar without any blots (dislikes)

[@JeremysITLab]

Oh, this is probably my only video like that! Awesome :)

[@MohamedFareed-f6v]

First, thanks for your effort what will be the ospf cost if fastethernet interface in router 1 linked to gigaethernet interface in other router after change reference to 10000? in another way , how will calculate ospf cost of routers linked with different type of interfaces?

[@deepbaban6864]

Will these videos be enough to pass ccna exam when you will complete this course.

[@JeremysITLab]

Probably, but I always recommend using multiple resources! Video course + books + practice exams

[@mharoonfrough719]

Well explained. Thanks 🙏

[@JeremysITLab]

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

[@abibossmeka7974]

what would i do without jeremy!!!!

[@ActionzvanNeshie11]

Thanks Jeremy my guy. Fantastic

[@JeremysITLab]

Thanks as always ;)

[@birajbanker]

Hey Jeremy, if you see this, at 21:26 you mention OSPF shares DBD in both exstart AND exchange states. Is this the same DBD shared twice?

[@birajbanker]

20:59*

[@JeremysITLab]

Yeah that's right. The first DBDs are just to determine who will start the exchange, after that the real exchange occurs.

[@birajbanker]

@@JeremysITLab hey thank you so much man. I passed the CCNA yesterday! Your videos were an integral part of my studying process. The morning of, I refreshed my knowledge by watching your VLAN and IPv6 vids. without you, I would've been stuck with Keith Bogart's videos from INE. No flack on Keith, but they were so dry man. From the bottom of my heart, thank you so so much

[@lagranbestiapoop]

Thanks, jeremy! It's a great explanation. Im going for the boson ExSim. where can i get a discount?

[@JeremysITLab]

Thank you! I'm not aware of any discounts at the moment.

[@birajbanker]

Check Reddit. r/CCNA also, currently there’s a MERRY25 discount code

[@EmilGerov-u2m]

slight error on the slide at 6:43. In the slide it should say 100 (R1 G0/0) + 1 (R2 L0) = 101

[@novinpradhan7629]

Thank you very much Jeremy. You have a great content.

[@JeremysITLab]

Thank you, I appreicate your comments :)

[@rotinoxy2978]

please question : from which day can i pass Ccna 200-301 ? thanks lot

[@JeremysITLab]

I guess it will take about 50 days to cover all of the topics

[@rotinoxy2978]

@@JeremysITLab thank you for your response , we are always here and with you , have good day

[@pissedputin7738]

Thank you for these free videos!

[@JeremysITLab]

Thanks for your comments, as always ;)

[@dbest19330]

I smashed the like button to show appreciation --> 600th like :)

[@JeremysITLab]

Thanks David ;)

[@hamedadam6150]

Very great thank you so much for your time everything Hamed Adam

[@mohamedoueslati4822]

Thank you Jeremy ! i bought a copy of Nexim but i still not finished the course yet ! what you reccomend ? use it before finishing course or i can select topics from it ? thank you again ! we are all supporting you and thankfull for what you are doing !

[@JeremysITLab]

Hi, I guess you mean ExSim? I recommend saving it until you have studied all of the exam topics! Then use it to find your weak points and review them.

[@HemanthJabalpuri]

Is there any condition for configuring IP for Loopback interface? Like only private address used or public like 1,1,1,1 2,2,2,2 can also be used?

[@kensliye94]

at 25:34 how could command "router ospf 1" been executed in interface configuration mode "R1(config-if)" and not global configuration mode "R1(config)"????

[@LucianC137]

When will we learn ACLs? Like around what day?

[@JeremysITLab]

Not sure about that. In the meantime, I recommend checking out Practical Networking's series on ACLs: kzbin.info/aero/PLIFyRwBY_4bRkAk_BkWL3ea6lRvOn8AKs

[@Alien-Networking]

Thank you for your great explanation.

[@JeremysITLab]

Thank you for your support! :)

[@leonardofloresramirez6075]

why is it recommended in 9:30 min to change the bandwidth reference and then the interface cost? I understood that no matter if we don't change the reference bandwidth because if we change the interface cost that's what's gonna remain (so in the end the reference bandwidth will have no importance). Did I understand it wrong?

[@faridgulum1226]

Jeremy, what is the difference between "bandwidth" and "auto-cost reference bandwidth" commands?

[@JeremysITLab]

'bandwidth' configures the bandwidth value of the interface. 'auto-cost reference-bandwidth' configures the reference bandwidth of the router. An interface's OSPF cost is calculated like this: *reference-bandwidth* divided by *bandwidth*

[@faridgulum1226]

@@JeremysITLab thank you, jeremy.

[@mustapha-d2k]

HELLO thank you for your effort , at 31:22 The command i think missing a "-" before bandwidth ----------------------- auto-cost reference-bandwidth

[@JeremysITLab]

You're right! Thanks for pointing that out