Public and Private Keys - Signatures & Key Exchanges - Cryptography - Practical TLS

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Practical Networking

Practical Networking

2 роки тому

Asymmetric Encryption requires two keys: a Public key and a Private key. These keys can be used to perform Encryption and Message Signing. Encryption provides Confidentiality, and Message Signatures provides Integrity and Authentication.
This lesson is a free sample lesson from the the greatest TLS and SSL training course ever created. No instructor rambling on about pointless stories. No slides with massive walls of text. No time wasting. Only simple, effective, and precise explanations. Complimented with practical illustrations and visuals.
🔐 More details about the course:
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🏢 Do you configure or troubleshoot TLS/SSL for work? If so, I'm willing to bet your employer would happily pay for this SSL training. Reach out if you'd like to coordinate an introduction for a bulk license purchase with your company. I'm happy to provide a generous referral bonus =)
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КОМЕНТАРІ: 370
@PracticalNetworking
@PracticalNetworking 2 роки тому
👉 *More free lessons:* ukposts.info/slow/PLIFyRwBY_4bTwRX__Zn4-letrtpSj1mzY ✨ *Full course:* pracnet.net/tls 💲 *Coupon Code* for 50% off: youtube50
@felixgallardo1783
@felixgallardo1783 6 місяців тому
This session was great, thank you!
@yiweima4412
@yiweima4412 16 днів тому
This is easily the most beautiful explanation video on UKposts to date.
@mertcancam
@mertcancam 2 роки тому
I can't thank you enough! Finally, I am beginning to truly understand all those topics that I have been struggling to grasp.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Excellent, Mustafa. Glad it's all "clicking" =)
@shayanpz7209
@shayanpz7209 2 роки тому
I watched different videos on UKposts to understand this concept and no one else explained this as good as you did! Great job 👏🏼
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you, Shayan. Glad this helped =)
@rogermcnulty887
@rogermcnulty887 Рік тому
I’m 38 years old and a newer IT professional after switching careers. I just recently earned my BS degree in IT and got hired at a major defense company. I’m watching these types of videos for better understanding of specific types of concepts covered in Security+. Also I’ve been personally using technology since the days of original Oregon Trail as a hobby. As my first ever UKposts comment: These videos are fantastic videos. You deserve way more subscribers than you have. Fantastic explanations man. Bravo.
@PracticalNetworking
@PracticalNetworking 11 місяців тому
Hi Roger! Thank you so much for the kind note, I'm honored to be the recipient of your first UKposts comment. =). Hope things are going well at the defense company =). Let me know if your team would benefit from in person training, I'd be happy to oblige. =)
@aditisinghpal1116
@aditisinghpal1116 6 місяців тому
I am a Law Student and was finding it difficult to understand the certain concepts of Information Technoloagy law involving core aspects of cybersecurity. This video simplified everything and explained articulately. Thank you to the author!
@santoshkumar-dr4qg
@santoshkumar-dr4qg 2 роки тому
Again, I am amazed about the nitty gritty details this video is providing. The author starts with basic concept and take it to another level once the basic is done. This increases our horizon in which the techniques can be used. Well done.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you, Santosh =) Glad you liked this video!
@lawrenceonlineshop7040
@lawrenceonlineshop7040 Рік тому
Good Teacher! Very rare to see someone taking difficult concepts and making it simple for others to understand better.
@peterchmelar8886
@peterchmelar8886 2 роки тому
Another gem :) Thank you for the uploads Ed. Every video is packed with useful knowledge.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you, Peter. Glad you're enjoying all of these =)
@lallu1122
@lallu1122 Рік тому
Super work - probably the best SSL videos on UKposts.
@bitfluent
@bitfluent 8 місяців тому
Concise, simple, and visual. Great video!
@karamjeetpadam4719
@karamjeetpadam4719 5 місяців тому
this is the most practical explanation of cyryptography in the entire UKposts.... thanks for such a simplified explanation!!
@privatesocialhandle
@privatesocialhandle Рік тому
My god, I can't believe I had to search so long for a video that makes sense for beginners. Subscribed.
@bentabarzadi3379
@bentabarzadi3379 Рік тому
I have never comment for any video EVER! but you are amazing! Simple, short and sweet! THANK YOU SO MUCH! WOW!
@vrk1219
@vrk1219 7 місяців тому
I can't thank you enough for the detailed explanations, providing necessary intricate details in a lucid and understandable way.... 🙇
@IliyaDamyanov
@IliyaDamyanov 7 місяців тому
This is the best video in the internet explaining this topic.
@rob651
@rob651 10 місяців тому
I have taken many tutorials online, watched many educational videos but your tutorial is so different. You are a great teacher sir. I dont understand how but the topic is explained in depth and at the same time in a very brief and concise way. Thank you very much! Keep up the good work!
@martinmokran6324
@martinmokran6324 2 роки тому
Another great video in Practical TLS series! Thank you.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you, Martin. Glad you enjoyed it!
@alistairbarros8192
@alistairbarros8192 14 днів тому
The best explanation and video I've seen on secure communications using asymmetric and symmetric keys, the illustrations and pacing of explanations are exemplary!
@tomnguyen1015
@tomnguyen1015 11 місяців тому
FINALLY sometime who actually understand and know how to explain things PROPERLY
@hasanalmuazzaz4678
@hasanalmuazzaz4678 9 місяців тому
thanks, no one else explained this as good as you did.
@rockystark9539
@rockystark9539 2 роки тому
Incredible performance, man needs a solid understanding of encryption to explain it in such a way. Well done.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Glad you enjoyed it =).
@roytitas
@roytitas 5 місяців тому
Thank you for explaining each topic with such clarity! This is very very helpful.
@terjidjurhuus1917
@terjidjurhuus1917 5 місяців тому
In a few minutes you managed to simply explain what hours of other videos managed to complicate. Thanks!
@helena8918
@helena8918 10 місяців тому
Best video yet, BY FAR. All well explained, and following all the principals that we should have in count when learning encryption and informatic security.
@mistershirokov5067
@mistershirokov5067 Рік тому
You are a great tutor and you’ve just got a subscriber, good sir. I’ve read tens of articles about ASE and this video is way better than any of them combined (although some were more about the actual functions than the general idea)
@encryptionforbeginners96
@encryptionforbeginners96 Рік тому
Thanks for the great video. I found the factors P and Q for the number 1909: P=23, Q=83. To do this, I used the "Quadratisches Sieb" factorization procedure, which operates as follows: First I calculate the square root of 1909 which gives the value "43.69". After that I set the factors P = 43 and Q = 44. Now the calculations follow. If I calculate P*Q (43*44), then this results in "1892". Since this value is smaller than "1909" I increase Q by one -> Q=45. Now I calculate again the product P*Q (43*45) -> "1935". The value is now greater than "1909", so I decrease P by the value 1 -> P=42. I follow these rules until the value 1909 is calculated. Summary: - P*Q (43*44) -> 1892 < 1909 -> Q+1 (45) - P*Q (43*45) -> 1935 > 1909 -> P-1 (42) - P*Q (42*45) -> 1890 < 1909 -> Q+1 (46) - P*Q (42*46) -> 1932 > 1909 -> P-1 (41) ..... - P*Q (23*83) -> 1909 = 1909 I hope this is helpful.
@PracticalNetworking
@PracticalNetworking Рік тому
Great write up! This proves 2 things: 1. Any key can be solved via brute force 2. Brute force doesn't necessarily require trying _every_ possibility, there are shortcuts you can take as you did =) Going to pin your post, to bring more attention to your write up and hopefully your channel. Good stuff!
@encryptionforbeginners96
@encryptionforbeginners96 Рік тому
@@PracticalNetworking Thank you for pinning. The great thing about the algorithm is also that this can be divided into several threads very well. So you could crack your RSA-1024 key on a graphics card quickly :-)!
@PracticalNetworking
@PracticalNetworking Рік тому
@@encryptionforbeginners96 The difficulty scales exponentially as the key size increases. To date the 1024 bit "RSA Number" factorization challenge has yet to be solved. en.wikipedia.org/wiki/RSA_Factoring_Challenge en.wikipedia.org/wiki/RSA_numbers#RSA-1024
@scottspa74
@scottspa74 Рік тому
Ummm you're sort of a genius
@danialranjbar9805
@danialranjbar9805 9 місяців тому
Thank you for your time and effort for sharing us all this knowledge for free.
@rpinto8800
@rpinto8800 2 роки тому
Thanks again for making this available to us, just finished the playlist enjoyed it, well explained.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Glad you've enjoyed it! Next video releases Monday =)
@tony_0088
@tony_0088 Рік тому
This video is awesome, congratulations guys! You explain complex topics in a very simple, elegant and didactic way.
@PracticalNetworking
@PracticalNetworking Рік тому
Glad you enjoyed it, Tony =). I'm sure you'll enjoy the rest of the Crypto series: ukposts.info/slow/PLIFyRwBY_4bTwRX__Zn4-letrtpSj1mzY
@vmkkannan
@vmkkannan Рік тому
the content you explain is in order and clear to the subject... easily understandable...
@adityae83
@adityae83 Рік тому
You explain really well, after going through few videos and still not grasping the concept your video and explanation helped me understand this concept well. Thank you for this video.
@chukwukauba2417
@chukwukauba2417 4 місяці тому
You have really simplified this mystery for me. Thank you!
@sgwong513
@sgwong513 11 місяців тому
agree, this is the best video series explain how the ssl/tls and encryption works.
@Frack_Black
@Frack_Black 2 роки тому
This channel has become my go to for catching up on stuff I haven't, previously, fully understood. The simple breakdown of the subject matter makes for easier digestion. 👏👏
@PracticalNetworking
@PracticalNetworking 2 роки тому
Welcome, Frack =). Glad you're enjoying this content and how I present it!
@PracticalNetworking
@PracticalNetworking 2 роки тому
Congratulations, you won the giveaway. Message me on discord to claim your prize -- pracnet.net/discord
@Frack_Black
@Frack_Black 2 роки тому
@@PracticalNetworking lovely, thank you. Will pm later.
@Frack_Black
@Frack_Black 2 роки тому
Thanks for the course. 😀
@ChaoticBeing-yj3ij
@ChaoticBeing-yj3ij 2 місяці тому
I was legit mind blown after seeing this video wonderful explanation
@markmanzo2488
@markmanzo2488 9 місяців тому
New sub here. I'm studying for the A+ after getting the Google IT Support Professional cert, and ran across your channel. It's really helping me fill in the gaps on some big topics I was confused on, and helping me understand more of the basics so I can in turn understand some of the more advanced stuff for the Network+ and Security+. I seem to be learning these concepts the way you are teaching them. Thank you.
@Scottpie47
@Scottpie47 Рік тому
Omg FINALLY an explanation of public/private keys that made perfect sense to me!! Thank you!!
@PracticalNetworking
@PracticalNetworking Рік тому
Glad this one helped, Scott =). You're very welcome.
@thecyberguard426
@thecyberguard426 8 місяців тому
o one else explained this as good as you did! Great job 👏🏼
@mmdbx
@mmdbx 2 роки тому
The way you explain things uses the right level of simplification, to facilitate understanding, but doesn't get lost in the details. Thanks for your great work, much appreciated! (I always had challanges to understand the difference between the concept of signatures vs. bulk encryption, but this visualization of yours, with the explanation helped a lot!)
@PracticalNetworking
@PracticalNetworking 2 роки тому
Glad this helped make it click. Thanks for the kind words, Gergely =)
@digitaldrive1192
@digitaldrive1192 2 роки тому
Very nice. Concise, clear with simple and effective animated diagrams. Not sure if it gets any better than this.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Glad you liked it! =)
@kaykay02120
@kaykay02120 2 місяці тому
no words to explain. excellent series
@AtharvBogra
@AtharvBogra 7 місяців тому
This video is awesome in explaining this concept and how hashing and encryption come together in PKI as this was what Ive been struggling to grasp in terms of the complete image! Awesome job.
@scottspa74
@scottspa74 Рік тому
Ed, you are absolutely the BEST!. I'm finishing a 2 year degree at Edmonds and feel like I've learned little (all during covid, virtual) and frequently refer back to your amazing instruction. You def have the calling of a professor (not to mention your obvious chops as an engineer).
@PracticalNetworking
@PracticalNetworking Рік тому
@jeffchen86
@jeffchen86 2 роки тому
Thanks bro!I struggled a lot to find out this stuff,but you help me a lot just in a few minutes!You are so amazing!
@PracticalNetworking
@PracticalNetworking 2 роки тому
Excellent Jeff! Glad it makes sense now. Cheers!
@fuadyhidayat
@fuadyhidayat Рік тому
What a great explanation. Finally it all make sense. Thank you for providing this video. Really really helpful.
@PracticalNetworking
@PracticalNetworking Рік тому
Cheers Fuady =) Glad it helped! Thanks for the kind words.
@rafay1708
@rafay1708 2 роки тому
You always know how to make life brighter for everyone you know. Thank you so much for spending your Golden time to make such useful Video. these Keys are not easy to understand and to explain but you make it so much easy to understand. Thanks, waiting for your next Video. ✌
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you for the kind words, Rafay. Glad you're enjoying this content =)
@gtbsaraiva
@gtbsaraiva 7 місяців тому
Incredible didactics method. Congratulations
@zs8850
@zs8850 Місяць тому
Absolutely brilliant content! Thank you for taking the time to create this!
@PracticalNetworking
@PracticalNetworking Місяць тому
You're very welcome. Glad you enjoyed it.
@po6577
@po6577 Рік тому
Best explaination I had seen out there! Thanks!
@renansantos8727
@renansantos8727 4 місяці тому
Thanks, saved my life with such clear explanation
@uttpalkant957
@uttpalkant957 8 місяців тому
Just wow, u explained everything so well
@atulsurjuse2916
@atulsurjuse2916 Рік тому
This is one of the best explanation of the difficult subject.I was struggling to understand the base of this topic..Now it's cleared.Thank you very much..!!
@OscarPerez-ox8sq
@OscarPerez-ox8sq 9 днів тому
So far best explaination seen on internet.
@alan29115
@alan29115 Рік тому
So many explanations go right over the actual essence of how these keys interact to encrypt and decrypt. Almost as if they don't even know it themselves, just regurgitating shit from a textbook. THANK YOU
@PracticalNetworking
@PracticalNetworking Рік тому
You're welcome, Alan =). I too agree I've heard many people attempt to explain this by simply regurgitating what others have said... agreed 100% =).
@blankblank1273
@blankblank1273 9 місяців тому
Perfect explanation. Thanks so much
@momo8718
@momo8718 Рік тому
I am currently reading a book on cryptography and hash functions and this is a really good illustration. Well done!
@PracticalNetworking
@PracticalNetworking Рік тому
Thank you, momo. =)
@ImageNxt
@ImageNxt 8 місяців тому
Very good clear explanation. Thanks.
@pinoyheartbeat7245
@pinoyheartbeat7245 5 місяців тому
I am currently enrolled in Cisco's cybersecurity course and I always look at this particular video whenever I get symmetric and asymmetric and public and private keys confused with one another. Very very good tutorial.
@fab5749
@fab5749 Рік тому
This is by far the best explanation on this topic
@PracticalNetworking
@PracticalNetworking Рік тому
Agreed =)
@yulanluo7328
@yulanluo7328 Місяць тому
Every clear and easy to understand, thanks for sharing!
@_bryanquinto
@_bryanquinto 10 місяців тому
clearest explanation ive watched. thanks!
@MultiBob1010
@MultiBob1010 Рік тому
Thank you so much, you made my day, I've been reading bunch of articles about it, there was unclear idea to me (which I can use the private key to encrypt the data and use the public one for decypt) by your video you made the pic clear to me
@PracticalNetworking
@PracticalNetworking Рік тому
Wohoo! Glad I could help. Glad it makes sense now =)
@tihomirvachkov3941
@tihomirvachkov3941 9 місяців тому
Eurica! Finally I got it !!!!!! Thank you very much dude !!!!!
@rajeshrama86
@rajeshrama86 Рік тому
The best explanation I came across after a lot of reading.................Thanks a lot sir
@DG-fs1pq
@DG-fs1pq Рік тому
I say this about each of your videos, but seriously....You are the best teacher when it comes to this material!!! I finally understand this clearly.
@PracticalNetworking
@PracticalNetworking Рік тому
Thank you, David. Glad you are enjoying this content =). If you are willing... could you do me a favor? Do you mind sharing these videos on Linked In, Reddit, Twitter, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ .
@DG-fs1pq
@DG-fs1pq Рік тому
@@PracticalNetworking I share it quite often. Thanks.
@PracticalNetworking
@PracticalNetworking Рік тому
@@DG-fs1pq In that case, *Thank you **_very_** much for your support.* Much appreciated
@ersoyyildirim5838
@ersoyyildirim5838 8 місяців тому
Such a perfect and clear explanation
@PracticalNetworking
@PracticalNetworking 8 місяців тому
Glad you enjoyed it!
@chittlingwhittles1198
@chittlingwhittles1198 10 місяців тому
Thanks for all of this. Superb content and presentation! Does anyone else feel guilty when you forget to like a video as you’re gobbling this stuff up?
@bill0cao
@bill0cao 7 місяців тому
Thanks for this great lesson which very clearly explains the topic!
@TotallyNotAuroras2ndChannel
@TotallyNotAuroras2ndChannel 5 місяців тому
Amazingly done again: using Pam's public key to encrypt so she alone can open it with her private key. Wow!!!
@sush_utagi
@sush_utagi 11 місяців тому
Thanks for the great explanation my man!
@AnantaAkash.Podder
@AnantaAkash.Podder Рік тому
This is the BESTTT lecture to Public & Private key & how TLS works... Thanks a Lot Man 😊❤️😊
@paolonervi2208
@paolonervi2208 2 роки тому
Your videos are really super useful and interesting.thank you for the time you dedicate in making these contents.greetings from Italy.Paul.
@PracticalNetworking
@PracticalNetworking 2 роки тому
Hi Paolo! Glad you enjoyed them! Thank you for the kind words. Cheers!
@blackbarry45
@blackbarry45 6 місяців тому
the series are awesome! Thank you for your content
@PracticalNetworking
@PracticalNetworking 6 місяців тому
You're very welcome. Thank you for supporting the channel !
@thongtranlequoc688
@thongtranlequoc688 9 місяців тому
amazing!!!
@leagueoflags
@leagueoflags Рік тому
Thank you, thank you, thank you! I finally got how it all works!
@chacopino
@chacopino 10 місяців тому
Excellent explanation!! Thank you very much!!
@CKZA10
@CKZA10 2 роки тому
Really well done video. There's not so many well-made videos that take on the concept, because you can't just dip your toe in the water and experience the totality and awesomeness of encryption and how it sets the stage for what we do and use daily. I can also highly recommend Paul Turner's UKposts videos on SSH and PKI. And then Ivan Ristić's excellent book on SSL and TLS (Bulletproof SSL and TLS - Feisty Duck publishing) - the book started off as a very good TLS 1.3 book but has transpired into something much more and is currently in its second edition (preview stage). If you truly want to get to grip with SSH and PKI - play with it on your PC. It's free and with a bit of virtualization you can toy with SSH Authentication against servers. Heck, PGP is also straight forward with GPG cli and on Windows you get Kleopatra for the GUI experience (although with GPG command line you can do a lot more like sub keys).
@PracticalNetworking
@PracticalNetworking 2 роки тому
Ivan's book is solid. I haven't heard of Paul, just looked up a few of his videos and yes, I agree, it also looks pretty solid. Glad to be compared to such high quality sources. Thanks, CKZA10 =)
@fishfanaticgokul4758
@fishfanaticgokul4758 4 місяці тому
Most valuable video i have seen in this year 🎉🎉🎉🎉 am really astonished ❤
@RaidenHeaven
@RaidenHeaven 2 місяці тому
You know why this video is the Best? Because it doesn't hide the fact you can Encrypt with public and Decrypt with private but ALSO Encrypt with private and Decrypt with public May are too scared to say that.
@PracticalNetworking
@PracticalNetworking 2 місяці тому
If you enjoyed this video, you'll love my video on RSA where I prove exactly that with the math =)
@alexl2512
@alexl2512 Рік тому
Thank you so much for your explanation. It is very clear and accurate. 🎉🎉🎉
@cevuwolf3077
@cevuwolf3077 Рік тому
I agree with Mustafa Mertcan CAM ,finally someone explained the proper way.Thanks a lot :D
@PracticalNetworking
@PracticalNetworking Рік тому
;) Thanks for the kind words.
@southern_smacker
@southern_smacker 11 місяців тому
I first tried to study Public and Private keys encryption back in 2002 after passing my Java 2 certification, but could not understand the concept. I then kept struggling with understanding how encryption and SSL/TLS works. Today this mystery is solved forever. I would like to thank the creator of this wonderful course.
@kartiknit1
@kartiknit1 2 роки тому
Excellent video, finally understood these concepts!
@PracticalNetworking
@PracticalNetworking 2 роки тому
Glad to hear, Karthik =). Cheers!
@prasadpulaguntla9255
@prasadpulaguntla9255 Місяць тому
The best video to understand how JWT works (although jwt is not explicitly discussed in the video). Can't thank you enough for such a clear and simple explanation!!
@prasadpulaguntla9255
@prasadpulaguntla9255 Місяць тому
I meant how JWT signatures work
@PracticalNetworking
@PracticalNetworking Місяць тому
Thank you for the kind words, and thank you for supporting the channel =).
@ShaliniNegi24
@ShaliniNegi24 9 місяців тому
Thank you for the video.
@hosseinshourabi398
@hosseinshourabi398 Рік тому
Woooooooonderful. I am amazed about deep details this video is providing. Well Done, Thank you so much!
@PracticalNetworking
@PracticalNetworking Рік тому
Glad you enjoyed it, Hosein =) You're very welcome.
@trino4965
@trino4965 9 днів тому
Thanks for making understand easy what I couldn't understand for years
@nidhisharma3578
@nidhisharma3578 3 місяці тому
Thank you for making it so easy to understand 🙏
@PracticalNetworking
@PracticalNetworking 3 місяці тому
You’re welcome 😊
@tusharludhrani8059
@tusharludhrani8059 4 місяці тому
this was the most amazing explaination ive ever heard!!!! thankyou sooooooo muchhhh
@shujauttali2608
@shujauttali2608 11 місяців тому
seeing your videos everyone will switch his/her career to networking 😍
@duygutemur3606
@duygutemur3606 2 роки тому
Amazing instructor! Thanks! 😍
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you =). Glad you enjoyed it!
@ManiacViews
@ManiacViews 8 місяців тому
Very helpful video
@kaidjohardudhiawala2549
@kaidjohardudhiawala2549 10 місяців тому
superbly explained
@MadhuCM
@MadhuCM 2 роки тому
This is just brilliant way of explaining 👏
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thank you, Madhu!
@wwolfram33
@wwolfram33 2 роки тому
Another great lesson. Actually, this is fantastic! Thanks!
@PracticalNetworking
@PracticalNetworking 2 роки тому
Thanks Ward =). Cheers!
@captainsloth5895
@captainsloth5895 5 місяців тому
This video is fantastic. Thank you.
@szilardfineascovasa6144
@szilardfineascovasa6144 Місяць тому
Boy, this video indeed demonstrated the mission of the channel as stated: hitting that sweet spot between basic and too complex. I often find myself frustrated right in that "Twilight Zone", googling and switching between articles and videos (only to become more frustrated). As someone else was saying, this made JWT make sense as well...after reading through stuff that was starting nicely, bulding up nicely, only to then muddy the waters in an epico style 😁. Was tempted for the first time to read the RFC. Bookmarked, subscribed, and will certainly chek the other videos. Thanks!
@PracticalNetworking
@PracticalNetworking Місяць тому
Thank you for the kind words! Glad you enjoyed this series. Thank you for supporting the channel =)
@neetadhavade
@neetadhavade 3 місяці тому
Superb! very well explained
@golus4963
@golus4963 2 роки тому
Appreciated and thanks to you for sharing the typical things into easy way....
@PracticalNetworking
@PracticalNetworking 2 роки тому
You're welcome, Golu.
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