IP Addresses Explained | Cisco CCNA 200-301
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- Опубликовано: 29 сен 2024
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What is an IP address?
An IP address is A unique identifier assigned to each device connected to a computer network
The most common analogy for an IP address is the postal service. For the postal service to work, every house needs to have its own, unique address. If you need to send a letter, you'll need to write the destination address on the envelope. That way, when you send your letter, the postman knows exactly where to deliver it.
Computers work in the same way. Each computer in a network needs to have a unique address, called an IP address.
and when sending data to a computer, just like letters, we need to add the destination address. We also need to include a return address, so they know where to reply.
An IPv4 address is 32-bits in length. It contains 4 sections, which are called octets. These octets are separated by periods. Each octet can, in theory, contain any number between 0 - 255
The IP address is separated into two parts. The first part represents the network and the second part represents the host. To know which part of an IP address represents the network, we use something called a subnet mask. In its simplest form, wherever you see 255. this is the network part of the address and wherever you see a zero, this is the host part of the address,
IP Address Classes
It was decided to split all of the available addresses into groups called classes. The idea was to make address allocation scalable.
We have class A, class B, and class C. Class D and E are reserved.
Class A addresses are between 1.0.0.0 to 126.255.255.255
0.0.0.0 and 127.0.0.0 are class A addresses but are reserved
With a subnet mask of 255.0.0.0
Max Hosts: 16,777,214
Class B addresses are between 128.0.0.0 to 191.255.255.255
With a subnet mask of 255.255.0.0
Max Hosts: 65,534
and class C addresses are between 192.0.0.0 - 223.255.255.255
With a subnet mask of 255.255.255.0
Max Hosts:254
Private IP Addresses
But there’s a problem. The problem is that no one could have predicted the massive explosion of computers and the internet. In fact, there are no more unallocated Ipv4 addresses left. That is why the new Ipv6 has been designed to give us more than enough IP addresses for everyone.
To help prolong the life of IPv4, we have carved out a small section from all three classes and called them, private IP addresses.
Private class A addresses are between 10.0.0.0 - 10.255.255.255
Private class B addresses are between 172.16.0.0 - 172.32.255.255
Private class C addresses are between 192.168.0.0 - 192.168.255.255
#ccna #cisco #networking
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Something is really attractive about your videos, the smoothness and simplicity in animations and colour schemes I think.. You will definitely succeed! Keep up the good work
Wow, thank you! Really appreciate the comment. Great to hear you liked the videos!
Finally, a good analogies.
Glad to find these channel
Ok, are IP Addresses unique to a device or a network??
Thank you so much! im currently taking Cybersecurity class and the coarse is all over the place, this video helps put everything in perspective. Much appreciate it!
Thank you Bernet! Good luck with the course! I'll be making some cyber security related videos soon!
you are absolutely perfect. the best tutor I have ever seen on youtube. thank you very much.
Wow thanks! I really appreciate the comment! Great to hear you like videos.
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Your are an absolute Legend for making this. Thank you so much!!! I didn’t even have to pause or go back 10 seconds I understood everything
Thanks for the comment Zee! Great to hear you liked it.
I get it but I just can't seem to put it in real world scenario also who is setting all theses addresses.. I need a real world example
I've watched several different videos on topics covered in the CCNA 200-301 exam and I am very pleased (so far) with the content provided by CertBros! The content and information provided feels relevant, up to date, and coincides with the information provided on the text book for the CCNA 200-301. The content provided is helping refining the information that I am learning in the book as well giving me a secondary insight and broadening my perspective on Networking in general. I look forward to listening in to all the content provided as I grind out the text to get my certification! Also the 99 problems shirt is funny AF! lol
Wow! Thanks for taking the time to write such a great comment Mark!
Really glad to hear you're enjoying the content.
I want to get into cyber security but I just don't seem to understand networking. Never had any problem programming, using linux or hardware but networking is just beyond me.
Networking is a really important skill in cyber security. This playlist will hopefully hep you out. Good luck!
I've been studying networking for 3 years, never got the hang of it. I have an exam tomorrow at 9am.
It is currently 11pm and I just found your channel, watched 3 videos so far and understood everything.
You might be my saving grace! Thank you!
Hi, ended up with a JavaScript question, so sadly I couldn't use my newfound networking knowledge, but thank you nevertheless 😁
Very spectacular information about ip's ,in sometime before i was lot of confusion within ip &how establish connection amid network but have after seen this video, will only say one word "perfect " ,
Keep it up & make more related ip address vlogs with some numerical example to understand how it execute behind network.
If you have seen this then send me your acknowledgement
watching all your videos before exams
if a IP adress start with 90 does it count as class A? my privat start with 192 so class C i guess
Absolutely correct! An IP address that starts with 90 is class A and your IP address that starts with 192 is a class C 🔥
I am confused about the statement that all IPv4 addresses have been allocated for yet we are still being assigned them from internet providers? Please explain :) Ty! x
Class A IP addresses (0-127 NOT 126), where the 1st bit is 0, encompass the range of 0.0. 0.0 to 127.255. 255.255. This class is for large networks and has 8 bits for network and 24 bits for hosts
GREAT CONTENT CERTBROS ! THANKS
i was so confused on that, thanks for the explanation.
and @7:20 how did you know that each class has how many host numbers?
an error to correct,it's 7 bits for the network,bro .thanks for the hint !
OK here's a very simple question that I hope someone can help me with. If I access the internet with my lap top computer from my home and then a second time form the WiFi at the local Starbucks does that mean I have two different IPs or is it the same one for both locations? Thank you.
Great question. You would actually use two private IP addresses (one for your home and one for your wifi) and two different public IP addresses (one assign to your home and one assigned to Starbucks). Hope that helps 😁
@@Certbros That's good to know. Thank You. 🙂
Amazing thx man . I almost got it slowly 😂... but u explained it wonderfull. Great Job
With IPv6 becoming more common I’m wondering if the IEEE will ever need to add another IP version, IPV7.
Hii, Why your network has the class A private network address, but class C subnet mask?
Dude, you were born to be a teacher, when are you dropping the course ???
There is nothing I can do until God truly arises then it will be known the difference between computers and the many eyes that are on the cherubim of Glory that carry the throne of God
This is explain perfectly thank you!
I literally paid for a whole course on networking elsewhere and somehow I cannot bear to open that course. Instead here I am on your videos during my leisure time. Your videos are very well made and something about the layout is just captivating 👌 Thank you!! And please make more videos! 😊
@7:20 how did you know that each class has how many host numbers? and why is it not 127 between the class A and B?
those videos helped me so much thank you you are explaining very well and simple that amazing better than my teacher lol
Wish this were recommended over the crappy video tutorials that talk a lot but don't say much
You should have added few lines on loop back address cause some may get confused what happened to 127.x.x.x. Other than that great video. Really helpful.
Thanks! Yep, I've had a few questions about that. Next time I update this video I will definitely include it. Great feedback, thanks again! 👍
Dear Sir,
The way you teach is very impressive, highly appreciated.
Bundle of thanks.
Technical Support Engineer
Momin Mohammad Hamza
IJ CONNECTS Islamabad, Pakistan.
Thank you Mormin!
Thank you so much this video was well put together and informative... Thank you.
Hi! Great video!
Thanks!
(Last line of the description says "Private class B addresses are between 192.168.0.0 - 192.168.255.255". *class C)
Great spot!! I've fixed the description now 👍 Thanks for the heads up.
About subnetmask of your system using in class C but your ip in class A can you miss something to teach for us?
Beautiful explanation my friend...I'm a nube and this made perfect sense
Thank you so much for making this easy to understand 👍
You are massive because i have understood IP Addressing simply
I think you have a mistake at 9:06 you say the difference is that public addresses are unique while private can be repeated.
But then at 10:10 you bring example to how public addresses can be repeated by 2 neighbors (your example).
Can someone clarify this?
Oh ok I think I understand now.
When you say private = relative to the network the device is in.
For some reason I thought private = company owned (like google)...
Very explanatory and useful video. Glad I discovered this channel.
Very clear explanation. About as simple as the official RFC documents. I was just reading the one describing IP.
I love the simple ASCII graphics they used.
Your animations and diagrams are also superb.
Would how how kgb read ip network via optical network threads
At 11:44, your IPv4 is 10.0.2.15 which belongs to class A, but the subnet mask is 255.255.255.0 which belongs to class C subnet. Why is that? Both should be of the same class I think. Thanks for your videos.
Great spot! We don't really use IP address classes anymore. That said, its important to learn then because they are still used in default configurations and routing tables.
its the default one you can change it but all devices connected to the router must have the same sub net mask
thank you for this, your contents are well explained and easy to grasp and follow. I'm kind of a slow learner, this is helping me a lot!
Thank you CertBros! You are doing great work making me understand network part of computer world
Thanks a lot I am a IP student but the way you explained it gave me a better understanding from what I learned in class
The problema Is that informazions are not nearly sufficient for the ccna. But anyway good free course
i really like your channel. all of the things i had not understood on t=certain subjects are thoroughly explained here
if going the open faucet route; put a bowl in the sink to catch some of the water to use for house-plants, WC tank, etc....once it fills, the rest can simply go down the drain or depending how long before someone needs to be preset to prevent spilling onto the floor: run a hose, that can just stretch over the faucet mouth, into a larger container. if all else fails you can borrow my hot-headed husband and cram him under your sink but remind him to take his heart meds!
When u fight a 10 year old kid that they want to grab yo ip address and intimidate you
random personal fact: this is the first video i find with 0 dislikes
Haha love it! You tempted to give it its first dislike? 😂
@@Certbros but then i’d have to find another one with 0 :p
good Stuff- makes it so interesting
I just completed my quiz on Coursera, and the question was how many IP addresses does a class C network have, and after getting it wrong, the correct answer was shown to be 256, but you say 254??? HELP
There are 256 total IP addresses available (x.x.x.0 - x.x.x.255) however there are only 254 usable addresses because 0 and 255 are reserved. Hope that helps
@@Certbros I should have just watched the next video it was explained there! haha
when I use "What is my IP?" It only shows an IPv6 address
I appreciate the simple class difference between A-C explanation, thank you
The King of Simple Explanations.
Thanks Arslan!
I dearly wish you'd put a link to your previous videos
This is helpful for me as a teacher, to explain complex subject in a very simple manner. You are a king of Simplicity.
That's really great to hear Ruel! Glad you found the video helpful.
Again thank you. Where were you 2 years ago when I first started. You are a teacher!!
Liked and Subscribed ... As it's worth
A question, if my internet provider gives me IP, my SIM card provider also gives me one IP? Is that correct? How can my phone connect with internet?
Correct 👍 You will have another IP with your phone provider.
great explanation man! I liked your use of example, youre a good teacher
dobry den prajem, hladam Marka Paulenku, dostavte sa na osetrovnu, spravime vam chemicku kastraciu
😲
That was a really clear way to explain a complex subject!
Quick qn :shouldn't class A be from 1.0.0.0 to 127.255.255.255?
Good question. 127.x.x.x is a special type of IP address reserved for loopback addresses.
Lesson pacing and explanation exceed expectations. Thanks.
I teach this same method to freshmen and non-traditional. The difference is visually u do a much better job!!! So note 2 ppl reading this, I would check out his feed. Thank you for doing this, it takes a lot of work.
I love the analogy. Analogies make abstract ideas so much clearer.
Glad you liked it!
doing some review, and this is one of the cleanest explanations i've seen since learning this
Are You on Udemy?
This was good.
Needed to re-learn some basics. Fantastic video!
An IP address is made up of 4 octets. each octet is 8bits long so 32 bits in total.
So to calculate the number of hosts supported by a particular class we use -
class A: (2^24)-2 = 16777214
class B: (2^16)-2 = 65534
class C: (2^8)-2 = 254
subtracting 2 because network id and brodcast id are reserved
Thanks
thanks i was trying to figure out how did he calculate that number.
How (2«24)
(2«16)
@@haneefahaneefa4200 2 to the power 24 is16777216
Why is it to the power of 2?
Best tutorials I've seen on the internet
Thanks really helping me with my networking class where the teacher just has us read the book the whole time!
i really love this video. understood very well. thank you so much sir. true legent
Thank you Lyandra 👍 Really appreciate the kind words.
Hey, Thank you so much for your videos, I’m deciding if I should pursue a career in IT and your videos definitely sold me into taking a course! Thank You 🙏🏼
Why is 127 not used in the first octet?
i didnt believe there is something perfect
until i watched this !!!
this tuts should be official source of networking... keep up the good work !
Great to hear! 🙏 perfect might be taking it a little far though haha.
After that never gonna say 255 again lol🤣
The Bros are back👍
Good to be back!
Hey! so i watched 4 videos of yours back to back. They are simple and amazingly awesome. Thank you very very very very very much. One request: can you also post videos on SIP, H323, webex, cisco voice, cisco unity, cisco telepresence, cisco meeting server, cisco conductor, cisco tps, cisco tms. please :)
Thanks! Glad to hear your liking the videos! I'm focusing on the CCNA at the moment but if enough people request those then I'll definitely look to make some of these in the future 👌
to be honest ， i think this video is fantastic, but i hope your videas can become longer ,in which i can know more detailed informations about network.
Glad you liked the video and I appreciate the feedback.
very useful video, thanks
interesting lectures.love from pakistan
Very informative and easy to understand.
Hi how do you get the number of host and addresses?, Great tutorial by the way.
this helped me so much my professor literally couldnt explain it as well as you thanks for the explanation
Im really struggling to understand computer networking, but this video really helped me as you would teach a kid in elementary school. Very good. Subscribed.
Wow the comparation between the houses on streets to computers on LAN was valueable.
Thanks!
I got a better intuitive feeling of the concept.
Also I learned new thing such as this classes.
I have a question for you, is this classification into classes useful?
Thank you for this online short video it was done well so well done.
Keep doing this.
Classes can be useful when dealing with simple or defualt configurations but we are no longer restricted by them.
A masterwork congratulation
Thanks 👍
Sir, Excuse me,
If i am provide Public IP address from my ISP to User WiFi but user's WiFi DHCP provide Private IP to user's devices 192.168.1.2 to 192.168.1.254 Else DHCP Server Relay can do this DHCP Public IP address send to all devices. Find it Network bit and Host bit all 1's and all 0's.
Thank you very much.
My question “why is it always 192” (in the army) has finally been answered
Haha! Glad I could help answer that for you.
good question
hi
Tq for help for easy explain sir
thank you for the video.
at 8:06, shouldn't it be like the following?
Class A: 1.x.x.x - 126.x.x.x
Class B: 128.x.x.x - 191.x.x.x
Class C: 192.x.x.x - 223.x.x.x
Excellent explanation
No problem 👍 Thanks for the comment.
At 11:47 the IPv4 address is 10.0.2.15, so it seems to be of class A. However, the subnet mask is 255.255.255.0, which is the subnet mask of class C.
Why is this so? Am I understanding something wrong?
Great question! Although its important to know the IP classes, we are no longer restricted by them. We can use 10.0.2.15 and use the subnet mask 255.255.255.0. This is called classless IP addressing.
@@Certbros Oh! I see. Thanks.
And btw, I didn't expect you to follow comments on such old videos! So, thanks again, it helps guys like me, who don't have any support in this subject a lot.
No problem Pallab, happy to help when I can! If you get any questions just ask 👍
Great video series. May I ask why is a subnet mask necessary if devices have MAC Addresses?
Another question, what is the difference between the Private IP address which is starting from 1) 10 2) 172 3) 192. Is there any standard there?
These are the three blocks that have been reserved for private IP addresses. Class A, B and C. The standard is RFC1918. I hope that answers your question.
These are range of IP classes reserved for private networks and the reason is to save wasted IP Addresses, for example, your pc or your router (default gateway) in your private network may have a private IP Address of class c: 192.168.1.1
you can use this IP just to communicate with devices in your same private network and cannot be used to surf the internet,
to go outside of your local network you will use your public IP address provided by your ISP (internet service provider), which is unique.
By the way, two local area networks or two subnets or two different private networks can have the same range of private IPs, for e.g network1 can have range of 10.0.0.0/8
and the same range network2
can get without IP conflict happening, because hosts are on different networks.
Very well explained...👌
Hello! I have a question. If the ISP gives a public ip address to several networks, how can he have enough public ip address to assign?
Thank you so much! What a breath of fresh air to see it explained so clearly
Thanks for the video! It explains very well!!
Thanks for the video! It explains very well!!
Thanks David!
Thank you CertBros. Really helpful video.
Great to hear it helped! Thanks.