Understanding an IP Address: Cisco Router Training 101

[@Kadalius]

Doing IP addresses in class this week. This is by far the most helpful video that simply breaks the concept down. Thank you.

[@doncrawley3478]

You're welcome. I'm glad it was helpful. Good luck with your class.

[@annetteparker-haynes4510]

What 5 people didnt like this video? Mr. Crawley's instruction was excellent. Thank you sir! Extremely helpful to this chick.

[@saravanankerberos1899]

Mr.Don Crawley is a legend. i would like to declare that i am one of his devotee.Thank you very much for all of your videos.

[@bctesla]

I was CCNA in 2014 . I love this refresher course . IPV6 will be implemented globally by 2000 , 2010 , 2020 2050 ? How long can NAT last ?

[@soundtraining]

You're welcome. I'm glad you liked it.

[@MSKChess]

After listening to many videos eventually i found this and the matter becomes almost clear. Will need to view it again to fully assimilate the concepts. Just like to thank you for taking the time - regards MSK

[@joeypage8286]

Thanks, I am busy with cca training and realy did not understand this ip to binary.. Thanks to your simple kolom system I totally understand it. Now I can focus on the rest of with less panic.. Great help

[@elevenz367]

1 hour before my exam. You are a GOD.

[@oCAVALRYo]

Thank you very much. My teacher tried to learn me, but i can see he did it in a very complicated way. I found this video right after my teacher stopped talking. And first now i understand the basics of binary and IP. Thaaank you so much, I thought i was lost ;)

[@soundtraining]

The class of the address is not determined by the subnet mask. Per RFC 791, the class is determined by the highest order bits of the address. If the highest order bit in the address is 0, creating a first octet value of 0-127, the address is a class A. If the two highest order bits are 10, creating a first octet value of 128-191, the address is a class B. If the three highest order bits are 110, creating a first octet value of 192-223, it's a class C. For more info, see tutorial on my website.

[@the1jmacify]

I've found this video VERY helpful with further explaining the Bits and Bytes of Networking course offered through Coursera by Google. I'm struggling with a graded assignment and this more in-depth exhibition of IPv4 addressing and subneting has been really helpful. Thanks for making this available.

[@soundtraining]

To continue, so you can take any address (A, B, or C) and apply any length of mask to it. The concept of classful addressing is mostly deprecated and now replaced by classless addresses. See RFC 4632 for more information about classless addresses as used in CIDR (Classless Inter-domain Routing). The RFCs are Requests for Comments which are technical documents detailing various protocols and other technologies used in networks. Search on the term RFC for more info.

[@Kryptooknight]

Mr. Crawley, First of all, thank you very much for this extremely simple breakdown of the IPv4. My Data Communications class brings me to your tutorial. I am able to completely follow your tutorial, however, when I check my current IP address at school, I'm getting a 10.20.xx.xx with a subnet of 255.255.255.0. I'm obviously missing something, as the first octet of the IP address classifies this as a Class A IP address which should have only the first octet of the subnet mask allocated for network but this subnet indicates that the first three Octets are reserved for the network instead based on your tutorial. Could you clarify this further please? Also, I haven't ventured into the IPv6 realm yet but I do see the notation of "Link-local IPv6 Address" in my command prompt with a hex value next to it BUT I see an IPv4 address right underneath it which is what my question is based on. Your input would be appreciated.

[@soundtraining]

Kryptooknight Great question. That's the whole point of subnetting. We're creating subnetworks, such as the 10.20 network you mentioned with the 24-bit mask (255.255.255.0). The subnet mask does not determine the class of the address. The class is determined by the leading octet. Classless addressing has replaced classful addressing. For more information, read tools.ietf.org/html/rfc1700 Here's a link to a Wikipedia article which does a good job of explaining link-local addresses: en.wikipedia.org/wiki/Link-local_address Good luck in school.

[@Kryptooknight]

soundtraining.net I got it! Thank you for taking the time to respond. I ended up forwarding this link to my entire class, your material delivery is impeccable. Subscribed.

[@donnellblakey8273]

thanks. There is so much to learn in the IT world... I feel like i will never make it :(

[@Machenziethemodel]

Donnell Blakey your not alone. I feel the same way.

[@dinman68]

I know you made this comment 3 years ago, and I hope you made it at the end. I am just in the first qtr and I'm so lost. I'm afraid I am wasting my time. But I keep being told to hang in there and I will get it.

[@ThePerezrudy2011]

@@dinman68 I am taking an online intro IT course, and I feel the same way, like I am wasting my time. While I am also trying to figure it out, because I have a family depending on me to get my bachelors degree. And I can't even figure our how to set up an IP address scheme.

[@dinman68]

@@ThePerezrudy2011 OMG The IP scheme!!! I just cant seem to get that in this old brain of mine. Next qtr I will be in Cisco class and I'm not looking forward to that at all. I'm only doing two years and only getting my AA. I chose this as retraining after getting hurt on the job and god I need to understand all this. But it is hard!!! Keep going Rudy you are not alone.

[@ThePerezrudy2011]

@@dinman68 Thank you, it definetly helps to know that I am not the only one that is struggling to understand most of this stuff. I did find an awesome channel that made it a whole lot easier to understand. The channel is "Sunny Classroom" his videos are very concise. Look him up.

[@ElvyJ1211]

Excellent video...great translation. Thank you soundtraining!!!

[@jonasmller3324]

wow best tutorial about IP Adresses, i have found on the internet so far! :D

[@trinimassive33]

I ABSOLUTELY AGREE!!! I was looking for a video and when I came across this and watched it... he literally made so simple for someone like my self to understand. I had to make notes for me to use and practice with.

[@cintifitz]

this is a splendid tutorial and answers questions my internal novice didn't yet know how to articulate, or where in the vast archives of information to begin learning. my circumstance has gone from woefully ponderous to exciting: light-at-the-end-of-the-tunnel experience. excellent, excellent, excellent. oh, and than you. pay no attention to that geoff crystal dork.

[@yosephtamrat]

Thank you so much, it is a lot clearer now for me after watching this video. 🙏🙏🙏

[@MsPrettierthanpink]

very comprehensive and informative! Great Video, thank you very much.

[@Mladenac]

Nice tutorial and pleasant voice :)

[@xenodata]

I get a lot of attacks on my website from international places. The list of ip addresses assigned to various countries I've looked at is too large to ban or sort through. So if I just ban the first two octets of an ip address, would that do a pretty good job of banning bad actors without having to resort to banning individual addresses? What about banning three octets?

[@clmc1789]

hm. My WiFi just was broken and it keeps braking, when ever it’s braking, there are 4 ip’s instead of 2... always at night... I found the ips using my iPhone WiFi thing that tells me the ip I don’t understand any of those video or how to read an IP address, some sketchy things have been happening round my area recently, this is VERY sketchy to me.

[@doncrawley]

It's impossible to diagnose what's happening with your wifi without doing further analysis. I feel like, if you don't understand this video or how to read an IP address, you should consider having a pro take a look at it. You might try opening a ticket with the maker of your wifi router and see if they can help. Good luck!

[@MMWA.F]

Nice and simple explanations! Thank you

[@BluuuePanCake]

when you explain how consecutive binaries will always be 1 less than the consecutive one (12:30) you just made my complete week by that "trick" that i will show in my next cocktail party.

[@rovert1964]

Best teacher yet!!

[@martenzzee7053]

thanks Mr Crawley.... your simply the Best!!!

[@martenzzee7053]

Thank you sir... was hoping you would have something on "switching and virtual networks"

[@liamvg]

If the IP and subnet and directly mathematically connected, why do we have to even specify the subnet mask? Shouldn't it autocalculate?

[@andresbonifacioviii8006]

easy to understand keep it up thanks

[@alexneufville344]

Great explanation, thank you.

[@drich7670]

Great video Don!

[@rickytik-devops]

i always have question about this subnet 10.0.0.0/24; ip is class A but subnet /24 belongs to class C; why is that? and it's acceptable even on cisco switch or cisco asa.

[@junaidtanoli1]

wow such nice explanation , i got it after alot of learning

[@olemengenge]

Great and easy to learn better than my college

[@abdulazimpatel8467]

Thank you Kind Sir just found your video and channel today. I have already subscribe.

[@harbardrvnclw285]

Due to the class which can be known from the first octet, isn't the IP address itself enough to tell which are network and host bits are?

[@soundtraining]

Great question. In classful IP addressing, you can identify the network and host bits based on the class of the address. Classful addressing, however, is no longer used. Consider the IP address of 10.2.3.4 with a subnet mask of 255.255.255.240. It's a class A address because of the 10 in the first octet, which, in classful addressing, would indicate that the first 8 bits are network and the remaining 24 are host bits. However, it uses a 28 bit mask. Therefore, the first 28 bits are network bits and the remaining 4 bits are host bits. The only way to identify network and host bits is by looking at the mask.

[@harbardrvnclw285]

soundtraining.net So should I stop classifying the IP Addresses into classes? Or classes still have some other purposes?

[@soundtraining]

Classes are sometimes used to assign default masks. Some certification exams may still ask about classes, but otherwise I don't see a need for it. If you, or anyone else, have other insights, please post them.

[@harbardrvnclw285]

Everything makes sense now. Thanks a lot. :)

[@elietabet7696]

Ravenclaw / E.L.F.

[@robertalaverdyan3150]

this is a really useful material.thank you a lot!

[@samuelmoriba1929]

thx so much sir u just make me understand more about IP address

[@ngetdara5994]

How I can get this book sir??

[@zerosugar2126]

Thank you so much, such a useful intro :)

[@Bolt-9]

Thank you!

[@viveksharma5884]

Excellent. Thank you

[@datacorico9199]

never knew obama was an expert in IP address

[@VishEramanpayghost]

Great Stuff.

[@savingdollarz]

Great video and its FREEEEEE!!!!

[@hamtiger14]

informative, thanks for sharing

[@Machenziethemodel]

Thank you

[@khukurinationx648]

Thank you.

[@isaalhajri]

thanks dude

[@richasagar4473]

thank you so much！！！

[@ill6ixx538]

Couldn't hear anything.

[@elietabet6572]

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[@elietabet6572]

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[@elietabet7696]

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