Error Detection and Correction 1: Internet Checksum

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Describes the calculation of the Internet Checksum, which uses repeated ones-complement addition. The checksum approach is a simply way of verifying that data is not corrupted during transmission. Much of this material is based on content from the book Data and Computer Communications by William Stallings.

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30 май 2016

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Комментарии : 47

@sammcconnell7940 5 лет назад

This helped a ton. My textbook just glossed over it briefly in words, which was a little confusing. Thanks for taking the time to make this!

@averageoutdoorsmannz2015 2 года назад

Why are youtube videos so much clearer and more concise than my lectures. Thank you for this.

@ruochenshen2108 2 года назад

The best Internet Checksum video I have seen so far, thanks!

@SciHeartJourney Год назад

Thank you for explaining the process first, then demonstrating it. Great video!

@renkangli7470 6 лет назад

Great explaination!!!!

@solominh2012 6 лет назад

Great lesson. Very easy to understand.

@flynnwoo 4 года назад

excellent tutorial, thx !

@rodolphoa.marinho2598 3 года назад

Thanks for the explanation!

@nobody-dy6ld 4 года назад

Thank you so much for your very helpful videos

@IndialovesyouBJP2024 3 года назад

thank you so much sir! easy to understand! was for great help!

@brunocotrim2415 3 года назад

Great Explaination!

@amirulhafeez9833 4 года назад

man you're a life saver!!!! thankk you definitely subscribe

@whyohmean 6 лет назад

Really love your videos. Very well explained! I'm trying to understand a modulo-2 CRC that has a step in which it says "Form the two’s complement of the remainder." Could you briefly explain what exactly they mean there? Nevermind, I found what I was looking for in another video of yours.

@JacobSchrum 2 года назад

It's now linked from the end card: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6gbkoFciryA.html&ab_channel=JacobSchrum

@murkyPurple123 4 года назад

Thank you!

@valenciofernandes2194 3 года назад

thanks, you saved my day

@AminAramoon 6 лет назад

Dude, you would make such a great teacher

@kristijannikoloski3777 7 лет назад

I have one question. When the receiver gets the message, what message he is going to send to the next layer? For example: Receiver gets this message: D68A AF02 B6AE, he sends to the next layer: D68A AF02?

@jean-paulboga8189 3 года назад

great explanation

@zeeshaniqbal5518 5 лет назад

awesome video

@camorton2 6 лет назад

Thank you

@bend.4506 6 лет назад

Thanks for the video. I was confused near the end though, isn't 9A4E+AF02 = 13950, which becomes 3951 after the ones complement? I got this becaues 9+A=19, minus 16=3, carry the one. This leads to a hex sum of C6AE.

@ditsokar4168 6 лет назад

You forgot to Carry the one from A+F which become 20 not 19

@ashishaswal7396 7 лет назад

thanks.. great help

@MAli-ti3nj 3 года назад

thank you and youtube :)

@Procyon58 7 лет назад

Thanks a lot!

@tails8491 5 лет назад

고마워요 형님

@user-dv7jq2us5q 3 года назад

헐 한국인이다

@spinrzlife8768 3 года назад

Thankk yyoooouuu love u

@Singhandsharmaforlife 3 года назад

After adding the checksum to thr sum I get 1 extra do this mean my message has error

@hannanbaig7888 6 лет назад

At the end, we get FFFF. As far as I know, we`ll have to take one`s complement of FFFF also. The receiver checks the checksum by taking the 1s complement of the sum of the received data (including the checksum) and checking whether the result is all 1 bits. If any of the bits are 0, an error is indicated.