Port Numbers Explained | Cisco CCNA 200-301

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In the last video, we looked at the layer 4 protocols TCP and UDP. Layer 4 is also responsible for choosing port numbers.
So why do we need port numbers? The example I give here is the postal service. To get post, you install a letterbox (at least here in the UK). This letterbox allows the postal service to access your home.
Network applications work in the same way. If you want to communicate over a network, you must allow some means of access to your device.
Let's say we want to access a web server. We type in the web address (also known as a URL) of the site we want to visit.
The first thing the computer does it convert that URL to an IP address.
This is done by using DNS, but we will cover than in another video. For now, just know it coverts web addresses to IP addresses.
The computer then sends the request to the webserver. The server will then look at the destination port to find out which application to send this data to. It can do this because there is a standard that port numbers follow.
When we made our web request, our computer knew we were trying to access a HTTP site. So it added the destination port number 80 to the TCP header.
The computer will also choose a randomly generated source port to receive reply’s on.
Several port numbers are called well-known ports. These are common protocols that have been assigned port numbers.
Examples of well-known port numbers are HTTP(80), HTTPS(443), SMTP (25).
0 - 1023: Well-known port numbers.
1024 - 49151: Registered ports that companies have registered IANA
49152-65535: Dynamic ports
Resources:
tools.ietf.org/html/rfc6335
www.iana.org/assignments/serv...
#ccna #cisco #networking

Пікірлер: 313

  • @user-or7ji5hv8y
    @user-or7ji5hv8y3 жыл бұрын

    Wow, I don’t know why others can’t explain this basic idea clearly. Thank you.

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks! Great to hear you liked the video. Thanks for watching!

  • @sharmarkenur8398

    @sharmarkenur8398

    3 жыл бұрын

    thanks i got point

  • @ngatijanoke6311

    @ngatijanoke6311

    2 жыл бұрын

    F::5

  • @hassanahmedsiddiqui5260

    @hassanahmedsiddiqui5260

    Жыл бұрын

    @Certbros Sir how can I find port on my window 10 laptop

  • @christinalahey327
    @christinalahey3273 жыл бұрын

    Thank you! My teacher has made port numbers sound like something that one can only understand with multiple doctorates

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks Christina! Great to hear the video helped you out. Port numbers are pretty simple once you get your head around it.

  • @MathoAvito

    @MathoAvito

    2 жыл бұрын

    LOL. true story!

  • @asit3061

    @asit3061

    Жыл бұрын

    🤣🤣

  • @becks3six9

    @becks3six9

    10 ай бұрын

    🤣🤣🤣🤣🤣 comment is so underrated

  • @dandele123
    @dandele1234 жыл бұрын

    Letting you know that I passed my CCNA 200-301 this week and your videos helped me do it! Thank you!

  • @Certbros

    @Certbros

    4 жыл бұрын

    Congratulations!! These are the comments I love the most!! Nice work 👍

  • @radtzerthecommanda8523

    @radtzerthecommanda8523

    Жыл бұрын

    I just begun my course with cisco so i will be a tier 2 engineer

  • @Malitubee
    @MalitubeeАй бұрын

    Bro literally why can’t anyone else just explain it just as easy as you did ! You made this click instantly ,it felt like everyone else was speaking a completely different language

  • @bwood6337
    @bwood63372 жыл бұрын

    Thanks! Everyone else only explained how ports are used without getting into what they actually are or how they operate which made it a lot harder to really wrap my head around them. You provided a really great balance of explaining that without getting overly complicated.

  • @berbid9051
    @berbid90512 жыл бұрын

    Never heard this simple yet comprehensive explanation in any of my computer classes in university. Thanks for this great video

  • @JoseRuiz-mf8zb
    @JoseRuiz-mf8zb Жыл бұрын

    This video made my life so much easier, I just spent a whole semester of just reading and reading and reading, and I literally learned more in this video than the whole semester

  • @fudoshin2776
    @fudoshin27763 жыл бұрын

    THANK YOU SO MUCH!!!! I was struggling with Ports but you just explained it so easily. Thanks again 🙏 💕

  • @Certbros

    @Certbros

    3 жыл бұрын

    You're welcome! Great to hear it helped 👍Let me know if you have any questions.

  • @flamey4446

    @flamey4446

    3 жыл бұрын

    @@Certbros thanks now I can boot people yay🤟🤟

  • @rishithilak2627
    @rishithilak2627 Жыл бұрын

    sir you are the perfect teacher ever i have seen you giving an every real time example for each topic this makes me practically strong.loved your teaching

  • @mrgigs08
    @mrgigs082 жыл бұрын

    I absolutely like your explanation guys! Keep on doing an amazing job!

  • @Randumb96
    @Randumb967 ай бұрын

    These videos have really helped me wrap my head around so many networking concepts

  • @mehdiroudeau8809
    @mehdiroudeau88097 ай бұрын

    i am from france and I still understand your explanation better than my own teacher thanks a lot m8

  • @jeffhirshberg5171

    @jeffhirshberg5171

    12 күн бұрын

    😊😊😊😊😊😊

  • @thelowertimeframes1442
    @thelowertimeframes14424 жыл бұрын

    Yes! Port numbers, came at a a great time. If you guys would make a video on Cryptography or Encryption, it would be too great!

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks Ron. Glad the video helped. Good suggestion. I plan on making some security videos in the future. 👍

  • @moneymaker3400
    @moneymaker34002 жыл бұрын

    Best video for this concept in the whole KZread.....love you guys❤️

  • @tokinabo
    @tokinabo2 жыл бұрын

    wow, a clear nice voice, at digestible pace, with in depth detailed and yet simple explanation! hard to come across those days..

  • @1leggeddog
    @1leggeddog2 жыл бұрын

    I've been in IT for 20 years and I still learned something from this. Never did get my ccna certificate, i just had to learn as I went after college

  • @srinis9801
    @srinis98012 жыл бұрын

    The videos from cetbros are really tremendous. The most of the topics the way you explained was awesome. The people will love and start learning who doesn't have idea or interest in Networking !!! . We are really awaiting for more tech videos !!! Appreciate your great works

  • @MathoAvito
    @MathoAvito2 жыл бұрын

    Thank you so much for the great explanation! The best sentence in this video was "IP address gets the data to the computer, but it's the port number that gets the right application" Wrote it down for myself.

  • @user-ni4fs5pb3q
    @user-ni4fs5pb3q6 ай бұрын

    I really enjoy and learn well from your videos . Watching your videos is great. :)) Thank you!

  • @andrewdelave
    @andrewdelave3 жыл бұрын

    This was the best explanation I've come across by far. Thank you!

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks Andrew! Glad it was helpful 👍

  • @thatguyluffy4941
    @thatguyluffy49413 жыл бұрын

    Crystal clear on the basics ! good explanation with the figures

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you!

  • @TeamEnneser
    @TeamEnneser2 жыл бұрын

    You nailed it. A neat presentation.

  • @shubhlaabh6342
    @shubhlaabh63426 ай бұрын

    Thanks for making such videos man, 👍 It's helpful alot

  • @tanzeelazam9552
    @tanzeelazam95523 жыл бұрын

    You truly deserve more likes and views. Arigato!!!

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks Tanzeel! Great to hear you liked the video 👍

  • @conorbase7776
    @conorbase77762 жыл бұрын

    This is a really informative and fruitful video. I nearly took notes for every sentence in the video.

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thank you Conor! Glad I could help!

  • @lawlietnao_music
    @lawlietnao_music3 жыл бұрын

    Beautiful explanation, thank you so much for your hard work!

  • @Certbros

    @Certbros

    3 жыл бұрын

    You're welcome! Thanks for the comment 👍

  • @shrutijain4126
    @shrutijain4126 Жыл бұрын

    Great work... Loved it ❤️

  • @ljg3794
    @ljg37943 жыл бұрын

    Simple but intuitive and powerful explanation! thank you!

  • @Certbros

    @Certbros

    3 жыл бұрын

    That's really great to hear! Thanks for the comment. Glad you liked it.

  • @denisewray4776
    @denisewray47763 жыл бұрын

    Thank you, your video took the confusion out of understanding what Ports are and how they work.

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks Denise! Great to hear it helped.

  • @lilianapatarroyo6432
    @lilianapatarroyo64322 жыл бұрын

    Thank you! You explained so clearly.

  • @volcanoab4419
    @volcanoab44192 жыл бұрын

    Brilliant ... absolutely the best!!

  • @raamch
    @raamch2 жыл бұрын

    Lot of useful and helpful information about port numbers. Thank you so much!

  • @mofojackson
    @mofojackson3 жыл бұрын

    Just saw your excellent video explaining TCP UDP and was going to ask if there was one on ports when this auto played haha. Awesome and exactly what I was wanting to know next

  • @Certbros

    @Certbros

    3 жыл бұрын

    Great to hear! IP Addresses next 👍

  • @mithun1247
    @mithun12473 жыл бұрын

    Thanks bro, your way of explaining these complex topics is the best. I learnt a lot from you. Thanks a lot. You earned a new subscriber

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you Mithun! Happy to help 👍 Welcome to the channel.

  • @luckyplay9919
    @luckyplay9919 Жыл бұрын

    This was so helpful!! Thank you

  • @saltech2024
    @saltech20243 жыл бұрын

    OMG!! Some tutorials are just too short but they explained everything you're looking for Thank you very much

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thank you Ibrahim! Really great to hear you liked the video. Good luck with everything.

  • @agyeirichmondowusu9670
    @agyeirichmondowusu96702 жыл бұрын

    Your explanations and examples are the best

  • @89ulfr
    @89ulfr3 жыл бұрын

    Best explanation I've heard on this topic...Thumbs up!

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thank you! Really glad to hear this 🙏

  • @buzingaaaa
    @buzingaaaa Жыл бұрын

    Thanks for the explanation that's so helpful ❤️

  • @sedikis.dolley3963
    @sedikis.dolley3963 Жыл бұрын

    Wow. Brilliantly explained

  • @sibusisosiyabongandaba698
    @sibusisosiyabongandaba6982 жыл бұрын

    This is so clear, i liked and subscribed right away :-)

  • @98854arjun
    @98854arjun Жыл бұрын

    Wow finally now i understood why a port is required

  • @shaahithahamadh4385
    @shaahithahamadh43853 жыл бұрын

    Crystal Clear Explanation 👍 Thank You.

  • @Certbros

    @Certbros

    3 жыл бұрын

    Glad you liked it

  • @aruizsilva
    @aruizsilva3 ай бұрын

    thanks for your work!

  • @itsjankiinenglish271
    @itsjankiinenglish2713 жыл бұрын

    This is an excellent video!!! OMG it helped me A LOT!!! to understand Ports numbers!!

  • @Certbros

    @Certbros

    3 жыл бұрын

    That's really great to hear! Glad you it helped you out 👍

  • @raulsanchez4716
    @raulsanchez47162 жыл бұрын

    Wow! This was an awesome video. Learned so much.

  • @kaidjohardudhiawala2549
    @kaidjohardudhiawala25492 жыл бұрын

    Superbly explained ,Thank you

  • @bhaskarrao6083
    @bhaskarrao60832 жыл бұрын

    Excellent explanation!

  • @gajlaxmitrader
    @gajlaxmitrader2 жыл бұрын

    You are simply awesome yaar Wow.. i mean nobody explain like this simple way

  • @techanalogies2629
    @techanalogies26292 жыл бұрын

    Great Video. Understood so much in few minutes rather than searching on the web for hours

  • @Certbros

    @Certbros

    2 жыл бұрын

    Great to hear it helped! Thank you.

  • @trevorkubonga1140
    @trevorkubonga11408 ай бұрын

    Hie thanks for a great review, im attempting to transition fro the construction industry into IT and i go introduced to the cisco skills for all program. I wasnt sure about its value but listening to this review has encouraged me a lot. My goal is cybersecurity and im not sure if i should leave the networking and focus on the security or i should run with both.

  • @itaybarok9405
    @itaybarok94052 жыл бұрын

    Continue posting videos that this. You are a great teacher

  • @578n.jhansisri5
    @578n.jhansisri5 Жыл бұрын

    After a long time my doubt got cleared 😀😀

  • @mattr7229
    @mattr72292 жыл бұрын

    Great explanation… thank you!!!

  • @micknimm-ne4ef
    @micknimm-ne4ef Жыл бұрын

    you make it seem so much easier.

  • @user-kb4qc9od6t
    @user-kb4qc9od6t2 жыл бұрын

    Thank you! Helped me so muc with my homework

  • @1juan1234
    @1juan12342 жыл бұрын

    Awesome video amigo , thank you 🙏🏼🙏🏼🙏🏼🙏🏼

  • @mohamedashik5374
    @mohamedashik53742 жыл бұрын

    Thank you very much good explanation 💯

  • @manaraljadani6309
    @manaraljadani63093 жыл бұрын

    You made it much easier to understand. Thank you so much

  • @Certbros

    @Certbros

    3 жыл бұрын

    Glad to hear it! 👌

  • @factswithai2
    @factswithai22 жыл бұрын

    great explanation, thanks for such good content

  • @zenrobotninja
    @zenrobotninja2 жыл бұрын

    Great explanation!

  • @rohullahhussaini3351
    @rohullahhussaini33512 жыл бұрын

    made it so simple, thanks

  • @VictoriaOtunsha
    @VictoriaOtunsha2 жыл бұрын

    Thank you for the simplification in the explanation.

  • @Certbros

    @Certbros

    2 жыл бұрын

    No problem at all. Glad you liked it Ogiri 😀

  • @mihailomarcetic2516
    @mihailomarcetic25162 жыл бұрын

    Great Explanation !!

  • @vtsitsilaras
    @vtsitsilaras2 жыл бұрын

    amazing videos!!

  • @robpickles3736
    @robpickles37362 ай бұрын

    I f'ing love CertBros!

  • @justicekatlehopelesa8672
    @justicekatlehopelesa8672 Жыл бұрын

    Thank you so much this is helpful

  • @zyghom
    @zyghom Жыл бұрын

    "wrong": your house address is your IP, your name on the letter is your port because you can have many people living under this address. Or, if instead of house if it is a block of flats: house number is an IP, room number is the port. But then we need also a "sub port number" for the names of people living in this room ;-)

  • @usernotfound1044
    @usernotfound10443 жыл бұрын

    Thank you!

  • @Certbros

    @Certbros

    3 жыл бұрын

    That's great to hear! Glad you got some value from this.

  • @lynxoffinland
    @lynxoffinland3 жыл бұрын

    a very helpful and informative video! Thankyou for educating me.

  • @Certbros

    @Certbros

    3 жыл бұрын

    You're welcome. Glad it was helpful!

  • @cathydowns5442
    @cathydowns54422 жыл бұрын

    Einfach wunderbar erklärt! Danke...

  • @iyanlaksanaputra8212
    @iyanlaksanaputra82128 ай бұрын

    That practice using powercell is so helpfull, i am newbie and i need more practical like this, especially when explaining about tcp/ip model, would like to know what exactly is happening inside the computer during encapsulating and decapsulating data from application layer up to physical layer. Or maybe explain in some 3rd party software like wireshark.

  • @itaybarok9405
    @itaybarok94052 жыл бұрын

    I understood the idea of giving a random port to the source because the port is used in the reply. Thanks. Also, I learned some new ports yet I would love to hear from you kore deeply about the 12 famus ports you showed because you did not go over all of them and you did not put enough information in each so I would like to hear more from it. However, wonderful video I learned from you in this video some important concepts and it sharped my knowledge.

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thanks for the feedback and I'm glad you liked the video.

  • @chiromorilla7448
    @chiromorilla74482 жыл бұрын

    Learning now for my CCNA cert

  • @bpd-ke6bs
    @bpd-ke6bs3 жыл бұрын

    Thank you for making such great videos

  • @Certbros

    @Certbros

    3 жыл бұрын

    No problem. Glad you like them!

  • @keerthanaa7740
    @keerthanaa77403 жыл бұрын

    Super... I just tried netstat command got information in details .. Thanks you so much..

  • @Certbros

    @Certbros

    3 жыл бұрын

    Great to hear! Glad you liked the video!

  • @johnconnor9787
    @johnconnor97873 жыл бұрын

    Awesome channel! Definitely thumb up!

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you!

  • @krishnabugudi2512
    @krishnabugudi25122 жыл бұрын

    Thank you sir. You have been great help 🆘

  • @Certbros

    @Certbros

    2 жыл бұрын

    No problem at all. Glad to hear it!

  • @msreddykotha5498
    @msreddykotha54983 жыл бұрын

    very crisp and spot-on, love your videos. Could you please make a video on Virtualization.

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks! Great to hear you liked it. Yes, virtualization is on my to-do list 👍

  • @KM-ew5rl
    @KM-ew5rl2 жыл бұрын

    Great best one now I get it!

  • @ETTopTech
    @ETTopTech2 жыл бұрын

    Thank you very much am from Ethiopia

  • @gardelrio9961
    @gardelrio99612 жыл бұрын

    Excellent explanation of ports.

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thanks Gardel!

  • @tato2493528
    @tato2493528 Жыл бұрын

    damn, what a clear explanation. ty

  • @brokencranium
    @brokencranium3 жыл бұрын

    Thanks! Great explanation!

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks! Appreciate the comment 👍

  • @MKOladapo
    @MKOladapo Жыл бұрын

    Well explained

  • @jennymo2197
    @jennymo21972 жыл бұрын

    fantastic content.

  • @broadspectrum3541
    @broadspectrum35412 жыл бұрын

    Please make video on other sections related to computer😭 please🙏 You guys are great in explaining the nuances. Thanks a lot.

  • @JohnDoe-101
    @JohnDoe-1018 ай бұрын

    Thanks!

  • @villages0001Facts
    @villages0001Facts2 жыл бұрын

    Good explanation

  • @nvlsvenu9336
    @nvlsvenu93362 жыл бұрын

    Thank You So Much!

  • @Certbros

    @Certbros

    2 жыл бұрын

    You're welcome!

  • @JaimeCB23
    @JaimeCB233 жыл бұрын

    Amazing videos and thanks for had shared with us

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thanks Jaime! No problem, glad you liked it.

  • @amenforthy2213
    @amenforthy22134 жыл бұрын

    could you please do an updated tutorial about STP ? btw great way of explaining new concepts to beginners !!

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks Amen! I appreciate the support. STP will be updated in the full course. It will have the same information it will just look and sound better.

  • @thelowertimeframes1442

    @thelowertimeframes1442

    4 жыл бұрын

    @@Certbros Looking forward to it

  • @jesiotra6246
    @jesiotra6246 Жыл бұрын

    thank you!

  • @frederickafrihyia6256
    @frederickafrihyia62562 жыл бұрын

    Thanks for sharing

  • @randyallen8186
    @randyallen81863 жыл бұрын

    Awesome! Thank you!

  • @Certbros

    @Certbros

    3 жыл бұрын

    No problem!

  • @L1vR-1948
    @L1vR-19483 жыл бұрын

    Thanks for this video :-) 👍

  • @RBASB10
    @RBASB102 жыл бұрын

    OMG! That was extremely informative. The person explanation was on point. Even the most stupid Person in the world could understand that intel. Thank you kindly Mr 🙏🏻

  • @ahilshaik8083
    @ahilshaik80833 жыл бұрын

    awesome man ...keep going

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you!

  • @04chavez
    @04chavez3 жыл бұрын

    Thanks for the video 🤠

  • @Certbros

    @Certbros

    2 жыл бұрын

    No problem 👍 Glad you liked it!

  • @bneutralnounprod.4948
    @bneutralnounprod.49482 жыл бұрын

    that was cool, thanks so much