TCP vs UDP Comparison | Cisco CCNA 200-301

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The two primary protocols at the transport layer are TCP and UDP.
A network application has to choose how to send its data. That choice comes down to reliable or unreliable transmission.
Both reliable and unreliable have their benefits and drawbacks.
TCP (Transmission control protocol) is the most widely chosen option for transmitting data. This is because it can reliably send and receive data.
The way TCP can provide such stable and reliable connections is in three ways.
1. Acknowledgements
2. Sequencing
3. Checksum
But, before any of that can happen, first we need to start a reliable connection.
TCP does this by using what's called a three-way handshake.
1. SYN
2. SYN-ACK
3. ACK
Now we have an open TCP connection. A similar process will be followed when closing this connection as well.
UDP (User Datagram Protocol) has none of the error handling, sequencing or reliability of TCP.
You can think of UDP as a kind of machine gun of data. Just firing and firing not caring if data is lost or not.
While TCP offers great connection and reliability, it comes at a price or resource and latency.
Where UDP is very useful is in a situation when we need live, real-time connections. For example, voice calls, video calls, and gaming all need fast real-time connections.
That’s it for the TCP and UDP, two ways to send data, for two different purposes.
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Thank you! Glad you liked it.

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I finally understand tcp now… thank you so much!

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Thank you 🙏🏿 Made it easy to understand

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Good explained. Thanks so much!

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Thanks for that explanation.... Very important to know differences between which apps use UDP and which one TCP's.

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Thank you. Glad it was helpful!

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You're welcome. Thanks for the comment!

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No problem Josh. Glad it helped.

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[@Theartist_of_GOD]

Great video I like the explanation! But I need to know what exactly the acknowledgement numbers do?

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Glad to hear that! Thanks Mohamed.

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Wow thanks! Great to hear you like the videos!

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Thanks Cody! Great to hear you like the videos. Good luck with the apprenticeship next week 👍 Haha yes I'm British. Did my accent give it away?

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Sorry, what is a lateny please? Is that the speed at which the data or file is sent? Thank you for these great videos. Thank you.

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Thanks you Rachi! Glad you like the videos!

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Thanks Daniel!

[@normbograham]

If you write 60 bytes in a UDP packet, then all the bytes are sent (wrapped in proper headers). If you write 60 bytes in a TCP packet, then you might get one or multiple packets, incuding some with 0 bytes data (with wrappers), or it might wait until, about 2/1000'ths of a second has passed before sending the packet. So, when you read the TCP packets at the other end, you have to know when to keep reading. A simple solution, is to add your own header, into your tcp ip packet sent. and then you can tell where one ends, and one begins. Another solution, is to use two UDP lines, where each side, have a client and a server.

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ty, sir

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Good, very good!

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Thank you!

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The moment you describe UDP as machine gun got me laughing so bad

[@Certbros]

🤣 Glad you liked it!

[@baaaaaaaaaaaaaaaan2066]

do you have videos for the other TCP Flags?

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i love all your videos please let me know where i can watch them from very beginning

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You can watch the playlist here on KZbin. I'm still making the course and regularly uploading videos here as well. Glad to hear you're getting value from them.

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No problem at all. You're very welcome.

[@swayamnayak7134]

what is the need of checksum in a udp header if it doesn't care about some lost or corrupted data?

[@fuzzy-02]

TCP is a experienced truck driver while UDP is a pizza delivery guy on a motorcycle.

[@hrrb5726]

ty

[@babaji1684]

Amazing...

[@Certbros]

Thanks! 👍

[@xeridea]

UDP good for situations where if the data was resent, it would already be useless, which is why it is good for realtime. If a part of a voice call is resent and received 2 seconds later, it is already useless.

[@aceban5441]

i have a question, UDP is used for live connections right?, is a Live stream like twitch considered a UDP?

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UDP is like the way my professors teach.

[@Certbros]

🤣🤣

[@saipragada7698]

what is checksum?

[@rhinoara7119]

Why checksum for udp??

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Can I know by when can we expect the full videos

[@Certbros]

Working on it now. There's still a lot to cover but its comming along nicely. Im hoping it will be later this year.

[@thechroniclesofjian8846]

❤️

[@nblgus2595]

Sending data got it 😂😂

[@bitonic589]

Why is there no NSP (not stupid protocol)? NSP sends all data in one

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now i cannot ignore imagining tcp as two people just sitting in each ends of a room shouting SENDING DATA.......GOT IT to each other XD

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♥️♥️♥️

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Wow

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Shout out sa CSU BSIT dyan.

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It's not ready yet but when it is it should be around $20. If you sign up to the mailing list in the description I'll send out a discount code when its launched.

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