I encourage EVERYONE to go buy the official course!!! I enrolled in an university that offers Cisco’s courses before i found these videos. The professor at the college institution , in charge of the lectures is NOT on par with Mr. Jeremy. I am not exaggerating! During my studies as an electrical engineer, I have not encountered another person with such profound understanding of the concept , like Mr. Jeremy. I don’t know how the guy does it. Great communication skills and vast knowledge!!! Great job!
Doing your lectures with screenshots to my iPad on Notability and writing down a lot of notes on Joplin in 2023 whilst having been working for some time in the telco-industry here in Finland, and just absolutely bravo Jeremy. What a treat these videos are.
0:01 Introduction 1:11 Things we'll cover 2:03 Review - Types of Dynamic Routing Protocols 2:43 Review - How Link State Protocols work 3:52 OSPF 5:41 LSA Flooding 8:25 Basic Proccess of OSPF 9:08 OSPF Areas 15:52 OSPF Areas Rules 18:44 Basic OSPF Configuration 22:26 passive-interface command 23:25 advertise a default route into OSPF 24:17 show ip protocols 29:05 Things we covered. 30:10 QUIZ!
Jeremy Jeremy! JJ oh man you have done it again, your lessons keep becoming sweeter and sweeter. Detailed, no stone left un-turned. Thanks for the theory. Haha unfortunately got one quiz question right. It will all sink eventually. Thumbs-up dude. You the man. Can't wait for the lump some notes from video 24 or 25. I subscribed (smiling!)
great explanations, I just recently landed a job as a NOC technician for an ISP and your course has definitely helped me get prepared for my ccna and feel more confident about my soon to start job, keep up the good work
Your tutorials are legendary, you make the whole networking concept so clear that it does not only help us to pass CCNA, but this series does have practical significance that I already use the concept you teach here to do real networking. I can not say enough thanks to you.
Excellent video series. Consistency is the key and it is the hardest thing to achieve. So many distractions are existing around us. I stopped this series almost 2 times but then came back with more passion. I am planning to finish till video 30, then print out all ANKI Flashcards ( I prefer traditional way to memorize stuff. I have converted Anki flashcards into a pdf file of 309 pages from day 1 to day 63) Then memorize all ANKI flashcards, do all the labs without watching any video (unless I stumble upon something or to verify if I have done the lab correctly) or using notes. Then continue again from Day 31. Day 45 to 63 will be easier for me as I have already completed Cisco CCST (Cybersecurity Pathway) on Netcad. Thank you so much Jeremy. I realized if merely watching these videos require so much consistency. How much effort was required for you to create this course. Salute sir.
I have visited several UA-cam channel but I believe this channel is best, here we can not only see video tutorials but also get exercise files, thanks a lot Jeremy for your hard work
Mr. Jeremy wish you all the best, I think actually everyone who watches your videos don't know how to thank you because your videos are adorable and we can understand easily, your videos are inspiring me to not give up and keep going on learning network, I just wanna thank you from my deep heart, I just download all but dont worry like all and viewer of all . i am asking you to keep going if anything happens you ave to or must complete this course because we need it and need your help I appreciate your all videos and thankful with all my respect my teacher TWANA AHMED BRNO from Kurdistan
Hello Jeremy i would like to thank you for making all these wonderful videos! I am currently a college student and my program has a computer networking subject. All this videos made me understand and love networking. I was able to pass my labs and exams and have gotten excellent marks! Im looking forward to take ccna after college and be a Network Engineer. Thank you!
Thank you for this covering of OSPF. I've been working through Neil's Udemy class and its for the most part good but I had to try something else for his OSPF coverage and this has been exactly what I needed thank you Jeremy.
Are you studying for ccnp yet? If you are or aren’t ospf gets more complicated 😂 BUT Ben piper on Pluralsight will take care of you. His course is pretty damn good
Hey Jeremy, thanks so much for making these videos and labs and flash cards available for free. I used the flash cards for this video and it helped me a lot to understand and really remember the content. So thanks again.
Hey Jeremy. Sam A. from AR, USA. Thanks so much for all your videos. You have an excellent method of teaching and explaining everything in such great detail. I especially enjoy the quizzes at the end. Appreciate all your efforts.
Thanks Jeremy, OSPF and Automation & Programmability are my two remaining topics, once I've those nailed down I'll try again after getting an 817 on my first go.
817! So close! Brush up on your weak spots and you'll definitely get it next time. Days 26, 27, and 28 should teach you all you need to know about OSPF for the exam, so stay tuned 👍
@@JeremysITLab Yeah I stupidly thought I could get through just on my net+ studying and a small bit of real-life experience, but as above those two topics were where I slipped up. Trust me I will be tuning in! Appreciate all that you do Jer.
Hi Jeremy I passed my CCNA yesterday 😅 I appreciate you your videos helped me a lot. My English was not so good but I understand all of your videos clearly.
Hi Jeremy at 32:13, can you explain why is the answer C? i've always struggled with a range of host and their wildcard mask. Do you have any lectures on these? a range of host and their respective wildcard mask
You're a saint Jeremy. I'm also looking out for the next parts of OSPF. Today I'll apply for my dream network engineer job. Hopefully I'll get to see you full OSPF training before I reach the technical interview :D
Thanks! :) OSPF will be three parts (I just finished writing the script for part 3), so six videos in total (lecture + lab for each part). Good luck on the interview!
Wow! One of the best and elaborated clip along with simulation lab that is a great lead to CCNA vendor test. I highly recommend. I can't thank you enough! 100% 💯💯⭐🌟💫🌟⭐
Hi jeremy at 21:14 you said, 'the network command is used to tell the router on which interfaces to activate the OSPF on', but i think this command actually enables OSPF on these interfaces but also only advertises the routes which you mention in the network command . Corect me if I'm wrong, thanks!
Thanks for this wonderful course!!! I wanted to say that the ID router can be specified as 0.0.0.1 for R1, 0.0.0.2 for R2, etc. not to be confused with IP addresses
@Jeremy's IT Lab.... i have gone through your CCNA videos, you have explained nicely!! . . . Kindly make videos on interview questions on some important L2 & L3 protocols, it would be very helpful for many ppl who are trying to attend networking interviews.
@@JeremysITLab Got it. I must have misunderstood since I thought the network command only activated OSPF on the interfaces and not advertised any networks.
@@jzero1579 Activating OSPF on the interface includes advertising the networks of those interfaces. I suggest reviewing the RIP&EIGRP video (Day 25) to review the function of the network command.
In the sample topology at 12:11, (1) Can you also add a point-to-point connection between the routers of Area 1 and Area 2 since both are already connected to Area 0? (2) Can you add another router in between those areas then you'll have interfaces connecting to Areas 0, 1, and 2?
Hi jeremy at 21:14 you said, 'the network command is used to tell the router on which interfaces to activate the OSPF on', but i think this command actually enables OSPF on these interfaces but also only advertises the routes which you mention in the network command. Because if you don`t do the "network" command to a given interface, it will not advertise the subnet it is connected to the other routers. Correct me if I'm wrong, please! And Thanks for your amazing course! I also bought at Udemy, but here there are Boson questions and labs.
In multi-area OSPF networks, all non-backbone areas must have an ABR connected to area 0. 2 OSPF routers with different process IDs can become OSPF neighbours. The OSPF area must be specified in the network command. An ASBR connects the internal OSPF network to networks outside of the OSPF domain.
@ 20:55 in the video, you create 2 separate 'network' statements for the 10.0.x.0 networks. Why did you do this? Wouldn't 'network 10.0.0.0 0.0.255.255 area 0' suffice? Creating a 10.0.0.0/16 network statement should include both networks, right?
thank you sooo much for sharing this whole course bro and making it accessible to EVERYONE..u are truly a blessing to this world man, wow!! I just watched ur David Bombal interview too yesterday man, really really inspiring stuff being that u just picked up this stufff a few years ago back and u explain it at expert level already dude!! love it!! thankful/grateful as FFF!!! thanks Jeremy !!!!!!!!!!!!!
Set the IP addresses in binary: 10.0.12.1/28 = 00001010.00000000.00001100.00000001 10.0.13.1/26 = 00001010.00000000.00001101.00000001 From here you can see the first 23 bits are the same so, the combined subnet mask is /23. The /23 mask is: 11111111.11111111.11111110.00000000 and to finally find the wildcard mask just invert 0s and 1s and you will get: 00000000.00000000.00000001.11111111 which is 0.0.1.255. If you activate them individually it would be 0.0.0.15 for /28 and /26 would be 0.0.0.63. But the question is to activate them with one command which is 0.0.1.255
can someone explain quiz 2's answer? How does that IP match the range when in the example config during the lecture we configured 10.0.12.0 & 10.0.13.0 separately ?
work out the broadcast ids of each network in the multiple choice, once you have address ranges you can easily determine which option accomodates both ip addresses... keep in mind in the video we used more specific prefix lengths, this is to configure a variety of subnets in one command
@25:25 you talk about router ID and order of priority, but I'm unclear of the significance. Why must you define the router iD? Is this simply a way to identify the router? Or is this relevant to the routing protocol? I'm coming back to these videos after a break of a few months (because the series wasn't finished) so maybe I forgot something you already covered in a previous video.
Yeah it's just a 32-bit number that identifies the router. For example, if you check the OSPF neighbor table (let's say on "R1"), you'll see the Router ID of all of R1's neighbors. It does play a role in a few things, which you'll see in Day 27/28.
at 21:33 youre talking about issuing the network commands with the wildcard masks. When you mention R1's G0/0 and G0/1, you keep saying /28 mask, but its written as /30 on the topology? Just want to make sure Im understanding properly! 0.0.0.3 would be a /30 wildcard mask no?
@@JeremysITLab you always answer so fast dude lol I know it’s probably the middle of the day in Japan. I think you might be the most interactive UA-camr with their audience lol thank you Jeremy!
There's no way you are only 50-60% done with this course.. That would be an insane amount of content. I would assess 75% but you know better than we do I suppose.
Check out the exam topics list: www.cisco.com/c/dam/en_us/training-events/le31/le46/cln/marketing/exam-topics/200-301-CCNA.pdf I haven't covered sections 4.0, 5.0, or 6.0, as well as IPv6, TCP/UDP, wireless, etc. The CCNA is a very big exam!
Hi Jeremy, As far as I know there is a Virtual Link in the OSPF protocol which allows you to connect two ares bypassing Backbone area. It is not recommended, but it is possible. P.S. Like others, I love your courses, thank you so much!
@Jeremy’s IT LAB - Jeremy, @32:00 you’re saying the 1st 7 bits of the 3rd octet must match right❓ Can you set new straight on why 10.0.14.1 wouldn’t work❓ I can see that 10.0.11.1 wouldn’t work since the 4’s bit is 0 0 0 0 1 0 1 1. If your saying the 1st 7 bits of the 3rd octet must match, wouldn’t 10.0.14.1 also work❓ Couldn’t we then say the wildcard mask could/should be 0.0.3.255❓ I know I’m mixed up...I’m totally upset at myself... What is it that’s deciding what’s supposed to match what❓ Are you saying that the bit sequence MUST MATCH EXACTLY - 0 0 0 0 1 1 0 = 12❓ ...with the last bit as ‘I don’t care’❓ Isn’t the range 10.0.12.1 - 10.0.15.1❓ Where am I going wrong here❓
10.0.12.0 0.0.1.255 matches 10.0.12.0 - 10.0.13.255. Both G0/1's IP address and G0/2's IP address fall in that range, so the command activates OSPF on the interfaces. The first 7 bits of the IP address must match, they are: [0 0 0 0 1 1 0] = 12 ('8' bit + '4' bit) The 8th bit of the 3rd octet doesn't have to match because the wildcard mask in the 3rd octet is 0 0 0 0 0 0 0 1 (0 = must match, 1 = don't care), so it can be 0 or 1. [0 0 0 0 1 1 0] 0 = 12 ('8' bit + '4' bit) [0 0 0 0 1 1 0] 1 = 13 ('8' bit + '4' bit + '1' bit) Watch Day 25's video again if you need a review of wildcard masks.
Hi Jeremy, regarding the Boson Ex-Sim Question, could you explain what does it mean for OSPF to "redistribute" the routes? Does this have to do with a router sharing different dynamic protocols (mixed EIGRP and OSPF), in other words, Router redistribution?
Does the router ID have something to do with the practice of using the last possible address for the interface facing an internal network or subnet ? for example 192.168.1.254 for the interface of the router facing the internal network ?
Hi Jeremy, can I ask a question regarding Quiz 1? At 31:11, if answer (a) is a correct statement, why is answer (b) not correct? For a single-area OSPF network, is the area not a backbone area? In other words, is it allowed that an OSPF network does not have a backbone area? Thanks.
Hi Jeremy Lab, Which router model was used for this lab and how do you configure the external links on Packet Tracer. How do you place the wires for .14 .254 and .126.
i have another question bro, the static route you are configuring... ip route 0.0.0.0 0.0.0.0. (ip) . didn't get that wildcard mask! shouldn't it be 255.255.255.255? because it should be whatever network! (any). with the 0.0.0.0 wildcard mask all the 0s have to match! which mean the specified network is 0.0.0.0. what I think that line means is any network that the router did receive and he didn't have in his routing table, he'd send it out through the gateway specified! still shouldn't the wildcard mask be 255.255.255.255 ?
So I tried to create the multi area ospf config from this video(area 0,1,2,3)with only one additional router in area 1,2, and 3 and cannot get all the routes to be shared among areas. In my config, abrs from area 0 that are the DR and BDR pass along inter area routes fine, but the DROTHER abr for the multi-access segment cannot. Is this correct?
hi jeremy hope ur doing fine ...little confused in quiz 2 the answer 10.0.12.0 0.0.1.255" converted to 10.0.12.0 subnet mask 255.255.254.0 /23 prefix. so the interface should have ip int that subnet . but it appears not , why ? would apppreciate your thought on this..thanx and have a good day.
Hi Jeremy how are you? can you please tell me how to configure multiple interfaces on Netsim because in the command summary they stated you should use "slotstarting" and that really panicked me, what does that mean ?
@@JeremysITLab Hi Jeremy first of all thank you for your training for CCNA i am trying to prepare the exam 200-301 and i am trying to join the CCNA flashcards but i can not join I have tried all kind of different payments method so what shall i do? thank you
Hello mister Jeremy i have one question On a broadcast network 10 routers are interconnected using ospf. How many adjencies will be established between Them? A 45 B 17 C 28 D 16 How to count please type
Firdha me either for the wildcard mask... i know the third octet need a ‘1’ as the they are different for 12 (“1100”) and 13(“1101”), but why the last eight octet can be 255? Is it because the wildcard mask follows the same rule as subnet mask that “0” cannot appear in the middle? So the last octet needs a 255 for wildcard?
ERRATA: At 21:33 I mention /28 masks regarding R1's G0/0 and G1/0 interfaces. Should have said /30 as written on the diagram and the command output.
Please your definition of ABR is it correct?it should not be router with interface connect to the backbone area and to at least one other interface?
@@fritzdamiendengambog9169 My definition is correct.
@@JeremysITLab ok thanks
i was so confused lmaooo
Caught that! 🙂 Was coming here to add a comment. I figured someone would have beat me to it... Glad they did. Thanks for doing these labs Jeremy!!
I encourage EVERYONE to go buy the official course!!! I enrolled in an university that offers Cisco’s courses before i found these videos. The professor at the college institution , in charge of the lectures is NOT on par with Mr. Jeremy. I am not exaggerating! During my studies as an electrical engineer, I have not encountered another person with such profound understanding of the concept , like Mr. Jeremy. I don’t know how the guy does it. Great communication skills and vast knowledge!!! Great job!
He does it from the heart!
Thats true.
He is the best
❤
I'm confused, why'd you encourage people to buy the official course if you believe Jeremy is the best course?
These videos are actually better than a lot of the paid ones I've watched.
i agree
so far Jeremy is the best teacher I found in teaching network course online, really hope you can expend your teaching in firewall stuff.
Doing your lectures with screenshots to my iPad on Notability and writing down a lot of notes on Joplin in 2023 whilst having been working for some time in the telco-industry here in Finland, and just absolutely bravo Jeremy. What a treat these videos are.
what a comprehensive introduction to OSPF , amazing as usual Jeremy
Thanks Mohammad, glad you like it :)
I passed my CCNA today. Special thanks to you for your video. I'm really grateful 🙏🙏🙏
congrats bro! ✊👊🤛🤜
Wow! This is called a perfect CCNA Tutorial......Thanks to Jeremy for putting complete effort.
Thanks Muhammad :)
Waiting for the next one?
0:01 Introduction
1:11 Things we'll cover
2:03 Review - Types of Dynamic Routing Protocols
2:43 Review - How Link State Protocols work
3:52 OSPF
5:41 LSA Flooding
8:25 Basic Proccess of OSPF
9:08 OSPF Areas
15:52 OSPF Areas Rules
18:44 Basic OSPF Configuration
22:26 passive-interface command
23:25 advertise a default route into OSPF
24:17 show ip protocols
29:05 Things we covered.
30:10 QUIZ!
Thanks! Added to the description :)
Jeremy Jeremy! JJ oh man you have done it again, your lessons keep becoming sweeter and sweeter. Detailed, no stone left un-turned. Thanks for the theory. Haha unfortunately got one quiz question right. It will all sink eventually. Thumbs-up dude. You the man. Can't wait for the lump some notes from video 24 or 25. I subscribed (smiling!)
Thanks as always Glenn, glad you like the videos :)
great explanations, I just recently landed a job as a NOC technician for an ISP and your course has definitely helped me get prepared for my ccna and feel more confident about my soon to start job, keep up the good work
Well done! NOC technician is a great start for a networking career,
Your tutorials are legendary, you make the whole networking concept so clear that it does not only help us to pass CCNA,
but this series does have practical significance that I already use the concept you teach here to do real networking. I can not say enough thanks to you.
The best course on the web. Way better than the paid courses!!
Absolutely true! I waste a lot of money until I discover Jeremy!
Excellent video series. Consistency is the key and it is the hardest thing to achieve. So many distractions are existing around us. I stopped this series almost 2 times but then came back with more passion. I am planning to finish till video 30, then print out all ANKI Flashcards ( I prefer traditional way to memorize stuff. I have converted Anki flashcards into a pdf file of 309 pages from day 1 to day 63) Then memorize all ANKI flashcards, do all the labs without watching any video (unless I stumble upon something or to verify if I have done the lab correctly) or using notes. Then continue again from Day 31. Day 45 to 63 will be easier for me as I have already completed Cisco CCST (Cybersecurity Pathway) on Netcad. Thank you so much Jeremy. I realized if merely watching these videos require so much consistency. How much effort was required for you to create this course. Salute sir.
ua-cam.com/play/PLA_lWKdCQ7yah2IVkXiMfqvvotFIYtnyH.html
Jeremy, I would like to confess, I completely fall in love with your videos, such a great job! Thank you many - many times! 🙏🙏🙏🙏🙏🙏
Thank you Alyona, I'm glad you like them!
Yeah, we all fell in love with him at first lecture xD
@@shlomiunger3518 me i guess the most who fell in love :)
I know we are not grading the lectures but the ospf series has got to be my all time favs. Iearned ospf after viewing them.
Thanks, glad you like them!
I have visited several UA-cam channel but I believe this channel is best, here we can not only see video tutorials but also get exercise files, thanks a lot Jeremy for your hard work
Thank you Rafika :)
Mr. Jeremy wish you all the best, I think actually everyone who watches your videos don't know how to thank you because your videos are adorable and we can understand easily, your videos are inspiring me to not give up and keep going on learning network, I just wanna thank you from my deep heart, I just download all but dont worry like all and viewer of all .
i am asking you to keep going if anything happens you ave to or must complete this course because we need it and need your help
I appreciate your all videos and thankful
with all my respect my teacher
TWANA AHMED BRNO from Kurdistan
Thank you so much for your kind words! Don't worry, I won't stop until the entire course is complete 👍
Hello Jeremy i would like to thank you for making all these wonderful videos! I am currently a college student and my program has a computer networking subject. All this videos made me understand and love networking. I was able to pass my labs and exams and have gotten excellent marks! Im looking forward to take ccna after college and be a Network Engineer. Thank you!
Thank you for this covering of OSPF. I've been working through Neil's Udemy class and its for the most part good but I had to try something else for his OSPF coverage and this has been exactly what I needed thank you Jeremy.
Are you studying for ccnp yet? If you are or aren’t ospf gets more complicated 😂 BUT Ben piper on Pluralsight will take care of you. His course is pretty damn good
Hey Jeremy, thanks so much for making these videos and labs and flash cards available for free.
I used the flash cards for this video and it helped me a lot to understand and really remember the content. So thanks again.
Hey Jeremy. Sam A. from AR, USA. Thanks so much for all your videos. You have an excellent method of teaching and explaining everything in such great detail. I especially enjoy the quizzes at the end. Appreciate all your efforts.
10:22 that noise indicates that you adjusted your position on your seat, and that made me feel closer to your physical space, Sensei.
Haha, awesome comment!
You said the truth he's a real SENSEI but also he's on his way of becoming a Hokage!
Thanks Jeremy, OSPF and Automation & Programmability are my two remaining topics, once I've those nailed down I'll try again after getting an 817 on my first go.
817! So close! Brush up on your weak spots and you'll definitely get it next time. Days 26, 27, and 28 should teach you all you need to know about OSPF for the exam, so stay tuned 👍
@@JeremysITLab Yeah I stupidly thought I could get through just on my net+ studying and a small bit of real-life experience, but as above those two topics were where I slipped up. Trust me I will be tuning in! Appreciate all that you do Jer.
u got 817 out of 1000 and failed in CCNA?
Yes, in 2021 - IIRC it was 900 to pass, whats the query?@@GovandMkarim
Hi Jeremy
I passed my CCNA yesterday 😅
I appreciate you your videos helped me a lot. My English was not so good but I understand all of your videos clearly.
Could you share your other resources you use to pass your CCNA, please
hands down, best ccna contente out there + it's free, thanks a bunch.
Thanks so much my best tutor so far in Cisco Networking.
Kudos to you Jeremy
Thank you! I'm glad you think so :)
Happy to spend time viewing legendary video clips. being a non-IT person getting to move to a new world.
Hi Jeremy at 32:13, can you explain why is the answer C? i've always struggled with a range of host and their wildcard mask. Do you have any lectures on these? a range of host and their respective wildcard mask
10.0.8.0 0.0.3.255 matches IP addresses 10.0.8.0 to 10.0.11.255, so it doesn't match either of the interface IP's.
Clean information, well structured and on point.thank you jeremy you are a life saver.
You're a saint Jeremy. I'm also looking out for the next parts of OSPF. Today I'll apply for my dream network engineer job. Hopefully I'll get to see you full OSPF training before I reach the technical interview :D
Thanks! :) OSPF will be three parts (I just finished writing the script for part 3), so six videos in total (lecture + lab for each part).
Good luck on the interview!
@@JeremysITLab hi jeremy, please when will you complete the CCNA vidoes? how many more videos remaining?
Thank you for your effort.
Q2:10.0.8.0 0.0.3.255 matches IP addresses 10.0.8.0 to 10.0.11.255, so it doesn't match either of the interface IP's.
Very Impressed with these videos. I'm using as a refresher before starting study for the CCNP and i'm finding them great. Thanks!
Wow! One of the best and elaborated clip along with simulation lab that is a great lead to CCNA vendor test. I highly recommend. I can't thank you enough! 100% 💯💯⭐🌟💫🌟⭐
i had to watch the video twice to fully understand this topic but it was worth it, thanks
I got your books (vol1 and vol2 2024 version) Jeremy! Amazing job. I am in this path an I hope to get certified next year. Thank you.
Hi jeremy at 21:14 you said, 'the network command is used to tell the router on which interfaces to activate the OSPF on', but i think this command actually enables OSPF on these interfaces but also only advertises the routes which you mention in the network command . Corect me if I'm wrong, thanks!
Man, I came to the same conclusion. Did you confirm it any other way?
Thanks for this wonderful course!!!
I wanted to say that the ID router can be specified as 0.0.0.1 for R1, 0.0.0.2 for R2, etc. not to be confused with IP addresses
Yep, any 32-bit number works.
@Jeremy's IT Lab.... i have gone through your CCNA videos, you have explained nicely!!
.
.
.
Kindly make videos on interview questions on some important L2 & L3 protocols, it would be very helpful for many ppl who are trying to attend networking interviews.
Thank you!
I will consider other video topics after I finish the CCNA course!
Brother you are like a AI in my life love you and God bless you
32:16 Regarding Question #2. Can someone explain why wildcard subnet is 0.0.1.255 every time I calculate it I get a different subnet. Thanks!
On 31:56 . The second quiz question. Can someone please explain in detail how specifying that range activates both the interfaces
10.0.8.0 0.0.3.255 matches IP addresses 10.0.8.0 to 10.0.11.255, so it doesn't match either of the interface IP's.
hey Sir, I found your explanation just so great and clear . The best so far .
Gotta love them wildcard masks!!! Another awesome lesson! xD
For most students it's 'gotta hate them wildcard masks!'
Glad you like them! :)
Clean information, well structured and on point. Great job Jeremy.. Thanks for your help..
Thanks, Emil :)
If the network command just tells the router to send hellos through the interfaces that match, why do you enable ospf on 172.16.1.0 (22:19)?
To make R1 advertise the network to its OSPF neighbors
@@JeremysITLab Got it. I must have misunderstood since I thought the network command only activated OSPF on the interfaces and not advertised any networks.
@@jzero1579 Activating OSPF on the interface includes advertising the networks of those interfaces. I suggest reviewing the RIP&EIGRP video (Day 25) to review the function of the network command.
@@JeremysITLab Thank you!
In the sample topology at 12:11,
(1) Can you also add a point-to-point connection between the routers of Area 1 and Area 2 since both are already connected to Area 0?
(2) Can you add another router in between those areas then you'll have interfaces connecting to Areas 0, 1, and 2?
Yeah, both are possible.
The visual really help. THNX Jeremy!!
Thanks for watching :)
Thank You Jeremy. You are awesome. Keep teaching. God bless you. Awaiting more videos.
Thank you! Glad you like the videos :)
Hi Jeremy, can brief about quiz 2 please? i'm lost
18:03 what would be a real life example ? and what configuration on router physical cables connected or cli ?
Great video on OSPF. Your explanations are on point. Thank you for your high quality product.
Thank you, I'm glad to hear that :)
Your course and labs are great, thanks for the study material
Hi jeremy at 21:14 you said, 'the network command is used to tell the router on which interfaces to activate the OSPF on', but i think this command actually enables OSPF on these interfaces but also only advertises the routes which you mention in the network command. Because if you don`t do the "network" command to a given interface, it will not advertise the subnet it is connected to the other routers. Correct me if I'm wrong, please! And Thanks for your amazing course! I also bought at Udemy, but here there are Boson questions and labs.
Hi Lucas,
It doesn't advertise the route in the 'network' command, it activates OSPF on the interface and advertises the network of the interface.
In multi-area OSPF networks, all non-backbone areas must have an ABR connected to area 0.
2 OSPF routers with different process IDs can become OSPF neighbours. The OSPF area must be specified in the network command. An ASBR connects the internal OSPF network to networks outside of the OSPF domain.
You nailed it again! Keep up good work!
Thanks Marko!
@ 20:55 in the video, you create 2 separate 'network' statements for the 10.0.x.0 networks. Why did you do this? Wouldn't 'network 10.0.0.0 0.0.255.255 area 0' suffice? Creating a 10.0.0.0/16 network statement should include both networks, right?
Thank you vey much for your efforts! Could someone please explain the calculation process in Quiz 2?
Nice video. The amount of detail is perfect.
Thank you :)
thank you sooo much for sharing this whole course bro and making it accessible to EVERYONE..u are truly a blessing to this world man, wow!! I just watched ur David Bombal interview too yesterday man, really really inspiring stuff being that u just picked up this stufff a few years ago back and u explain it at expert level already dude!! love it!! thankful/grateful as FFF!!! thanks Jeremy !!!!!!!!!!!!!
28:08 I cannot see maximum-path command on Cisco Packet Tracer. Is it a Packet Tracer thing?
This is so much easier to understand than my teacher, much easier to understand with a visual component
Thank you Jeremy for all your efforts. Keep up the good work.
Thanks Alberto :)
Thank you for these videos! Can you go more in depth on how you figured out the answer for Quiz question #2.
10.0.8.0 0.0.3.255 matches IP addresses 10.0.8.0 to 10.0.11.255, so it doesn't match either of the interface IP's.
Thanks for your support
Thank you ;)
quiz 2 question, for /28 the wildcard would be 0.0.0.15 and /26 would be 0.0.0.63, where did 0
0.0.1.255 come from ?
Set the IP addresses in binary:
10.0.12.1/28 = 00001010.00000000.00001100.00000001
10.0.13.1/26 = 00001010.00000000.00001101.00000001
From here you can see the first 23 bits are the same so, the combined subnet mask is /23.
The /23 mask is: 11111111.11111111.11111110.00000000 and to finally find the wildcard mask just invert 0s and 1s and you will get: 00000000.00000000.00000001.11111111 which is 0.0.1.255.
If you activate them individually it would be 0.0.0.15 for /28 and /26 would be 0.0.0.63. But the question is to activate them with one command which is 0.0.1.255
@@michaelrose4037 Thanks.
@@michaelrose4037thank you!
@@michaelrose4037 Thank you for also answering my question. Many Thanks
@@michaelrose4037 Thanks as well this was so helpful. Kind of a bummer he didn't bother to explain that in the video...
can someone explain quiz 2's answer?
How does that IP match the range when in the example config during the lecture we configured 10.0.12.0 & 10.0.13.0 separately ?
work out the broadcast ids of each network in the multiple choice, once you have address ranges you can easily determine which option accomodates both ip addresses... keep in mind in the video we used more specific prefix lengths, this is to configure a variety of subnets in one command
Thanks, you have unique way to teach when this course will be completed and we seek for another courses from you ❤️
Thank you :)
@25:25 you talk about router ID and order of priority, but I'm unclear of the significance. Why must you define the router iD? Is this simply a way to identify the router? Or is this relevant to the routing protocol? I'm coming back to these videos after a break of a few months (because the series wasn't finished) so maybe I forgot something you already covered in a previous video.
Yeah it's just a 32-bit number that identifies the router. For example, if you check the OSPF neighbor table (let's say on "R1"), you'll see the Router ID of all of R1's neighbors. It does play a role in a few things, which you'll see in Day 27/28.
at 21:33 youre talking about issuing the network commands with the wildcard masks. When you mention R1's G0/0 and G0/1, you keep saying /28 mask, but its written as /30 on the topology? Just want to make sure Im understanding properly! 0.0.0.3 would be a /30 wildcard mask no?
Yep, it's /30
@@JeremysITLab you always answer so fast dude lol I know it’s probably the middle of the day in Japan. I think you might be the most interactive UA-camr with their audience lol thank you Jeremy!
Listen up! I want to welcome you to Jeremy's It lab!
@Kace Seth dont tell me you actually believe that
@@Laevatei1nn That's a bot.
@@jzero1579 lmao how stupid of me
There's no way you are only 50-60% done with this course.. That would be an insane amount of content. I would assess 75% but you know better than we do I suppose.
Check out the exam topics list: www.cisco.com/c/dam/en_us/training-events/le31/le46/cln/marketing/exam-topics/200-301-CCNA.pdf
I haven't covered sections 4.0, 5.0, or 6.0, as well as IPv6, TCP/UDP, wireless, etc. The CCNA is a very big exam!
@@JeremysITLab Well based off of their percentages that means you have covered 65%... not too bad! Keep it Jeremy! We support you bro!
Hi Jeremy,
As far as I know there is a Virtual Link in the OSPF protocol which allows you to connect two ares bypassing Backbone area. It is not recommended, but it is possible.
P.S. Like others, I love your courses, thank you so much!
Clean information, well explained ✌ thank you for your efforts :)
@Jeremy’s IT LAB - Jeremy, @32:00 you’re saying the 1st 7 bits of the 3rd octet must match right❓
Can you set new straight on why 10.0.14.1 wouldn’t work❓
I can see that 10.0.11.1 wouldn’t work since the 4’s bit is 0 0 0 0 1 0 1 1.
If your saying the 1st 7 bits of the 3rd octet must match, wouldn’t 10.0.14.1 also work❓
Couldn’t we then say the wildcard mask could/should be 0.0.3.255❓
I know I’m mixed up...I’m totally upset at myself...
What is it that’s deciding what’s supposed to match what❓
Are you saying that the bit sequence MUST MATCH EXACTLY - 0 0 0 0 1 1 0 = 12❓
...with the last bit as ‘I don’t care’❓
Isn’t the range 10.0.12.1 - 10.0.15.1❓
Where am I going wrong here❓
10.0.12.0 0.0.1.255 matches 10.0.12.0 - 10.0.13.255. Both G0/1's IP address and G0/2's IP address fall in that range, so the command activates OSPF on the interfaces.
The first 7 bits of the IP address must match, they are:
[0 0 0 0 1 1 0] = 12 ('8' bit + '4' bit)
The 8th bit of the 3rd octet doesn't have to match because the wildcard mask in the 3rd octet is 0 0 0 0 0 0 0 1 (0 = must match, 1 = don't care), so it can be 0 or 1.
[0 0 0 0 1 1 0] 0 = 12 ('8' bit + '4' bit)
[0 0 0 0 1 1 0] 1 = 13 ('8' bit + '4' bit + '1' bit)
Watch Day 25's video again if you need a review of wildcard masks.
Jeremy's IT Lab - Thank you Jeremy...
when the screen shows the config. mode and interface , the reference topology diagram should be shown too . That will be easier to understand .
Hi Jeremy, regarding the Boson Ex-Sim Question, could you explain what does it mean for OSPF to "redistribute" the routes? Does this have to do with a router sharing different dynamic protocols (mixed EIGRP and OSPF), in other words, Router redistribution?
Yes, 'redistribution' involves sharing routes from outside of the routing protocol into it (like static, connected, or EIGRP routes into OSPF)
@@JeremysITLab got it. Thanks
Silly questions probably, but during the default-information originate section at 23:24, I assume you do that after #network ospf 1?
What is the point of configuring ospf on R1 G2/0 if we are just going to put it in passive?
To advertise the network
@@JeremysITLab I thought the passive stops the advertisement off that interface or am I misunderstanding what passive does?
@@KeyumizIt prevents hello messages from being sent out of that interface
@@JeremysITLab Okay, thanks must have missed that
I am really struggling with questions like Quiz 2. Could someone please help me?
Does the router ID have something to do with the practice of using the last possible address for the interface facing an internal network or subnet ? for example 192.168.1.254 for the interface of the router facing the internal network ?
Thanks Jeremy for your great work as always
Thanks :)
Hi Jeremy, can I ask a question regarding Quiz 1? At 31:11, if answer (a) is a correct statement, why is answer (b) not correct? For a single-area OSPF network, is the area not a backbone area? In other words, is it allowed that an OSPF network does not have a backbone area? Thanks.
Hi Jeremy
@16:17: Areas should be contiguous > Does this mean each area can only be connected to single ABR or ..... ?
No, an area can have multiple ABRs.
@@JeremysITLab Hm ! to work together, they will have to have same subnet and area configured - please correct me ?
@@talalakbarlaghari They don't have to be in the same subnet.
Thanks for the content, have learned a lot
Hi Jeremy Lab, Which router model was used for this lab and how do you configure the external links on Packet Tracer. How do you place the wires for .14 .254 and .126.
@jeremy's IT Lab
i have another question bro, the static route you are configuring... ip route 0.0.0.0 0.0.0.0. (ip) . didn't get that wildcard mask! shouldn't it be 255.255.255.255? because it should be whatever network! (any). with the 0.0.0.0 wildcard mask all the 0s have to match! which mean the specified network is 0.0.0.0.
what I think that line means is any network that the router did receive and he didn't have in his routing table, he'd send it out through the gateway specified! still shouldn't the wildcard mask be 255.255.255.255 ?
Static routes don't use wildcard masks.
At 21:30 you say you specified 10.0.12.0 with a slash 28? Sure seems like its a /30 0.0.0.3 ? Is this an error or am I missing something?
Yes it was an error. It is mentioned in the pinned comment.
32:11 Quiz 2 , can anyone please tell me why wildcard mask in the answer is 0.0.1.255? Thanks
Write it out in binary and see which bits match! None of the other options (A, B, or D) match both 10.0.12.1 and 10.0.13.1.
So I tried to create the multi area ospf config from this video(area 0,1,2,3)with only one additional router in area 1,2, and 3 and cannot get all the routes to be shared among areas. In my config, abrs from area 0 that are the DR and BDR pass along inter area routes fine, but the DROTHER abr for the multi-access segment cannot. Is this correct?
Distance vector Protocols works on "Bellman Ford Algorithm". Remember this name too!
hi jeremy hope ur doing fine ...little confused in quiz 2 the answer 10.0.12.0 0.0.1.255" converted to 10.0.12.0 subnet mask 255.255.254.0 /23 prefix. so the interface should have ip int that subnet . but it appears not , why ? would apppreciate your thought on this..thanx and have a good day.
Both 10.0.12.1 and 10.0.13.1 are matched by 10.0.12.0 0.0.1.255.
Hello Jerems.I will take an exam this year.İs videos still up to date?
Hi Jeremy how are you? can you please tell me how to configure multiple interfaces on Netsim because in the command summary they stated you should use "slotstarting" and that really panicked me, what does that mean ?
Should be the same as I have shown a few times throughout the course. For example, 'interface range g0/1 - 2'.
Thank you, may Allah help you in your life.
We await the next video.
Thank you Saleh :)
@@JeremysITLab Hi Jeremy first of all thank you for your training for CCNA i am trying to prepare the exam 200-301 and i am trying to join the CCNA flashcards but i can not join I have tried all kind of different payments method so what shall i do? thank you
@@BeyondTheCosmos17 The flashcards are free. Follow the link in the top line of the description
Hello mister Jeremy i have one question
On a broadcast network 10 routers are interconnected using ospf. How many adjencies will be established between Them?
A 45
B 17
C 28
D 16
How to count please type
Excellent content, I'm grateful for the channel.
Welcome back sir
Thank you! :)
🙏 So helpful am back
From KE
Thank you :)
Jeremy I don't know why I just feel blank about the quiz number 2. I get confused with the wildcard result.
Firdha me either for the wildcard mask... i know the third octet need a ‘1’ as the they are different for 12 (“1100”) and 13(“1101”), but why the last eight octet can be 255? Is it because the wildcard mask follows the same rule as subnet mask that “0” cannot appear in the middle? So the last octet needs a 255 for wildcard?
Think of it like the subnet mask 255.255.254.0.
'10.0.12.0 255.255.254.0' matches 10.0.12.0 through 10.0.13.255.
@@JeremysITLab ok thank you :)