Mrežni protokoli su kao univerzalni jezik interneta - bez njih... Show more
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Updated May 8, 2026
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Osnovni mrežni protokoli: IP, TCP, UDP, HTTP i više
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Osnove mrežnih protokola
Zamišljaj mrežne protokole kao pravila saobraćaja na internetu - svaki uređaj mora da ih poštuje da bi komunikacija funkcionisała. Svaki put kada pošalješ poruku ili otvoriš Instagram, pokreće se ceo lanac protokola koji rade zajedno.
Paket je osnovna jedinica podataka koja putuje kroz mrežu. Tvoja poruka se deli na male delove (pakete), svaki dobija "adresnu nalepnicu" i putuje nezavisno do odredišta. Na kraju se svi paketi sklope nazad u originalnu poruku.
IP adresa je kao poštanska adresa tvog uređaja na internetu. Bez nje, internet ne bi znao gde da ti pošalje podatke. Port je broj koji označava koju aplikaciju na uređaju - dok IP adresa nalazi tvoj telefon, port 443 kaže da podaci idu za Chrome, a ne za Viber.
💡 Zapamti: IP adresa = adresa zgrade, port = broj stana u toj zgradi
IP protokol - osnova interneta
IP (Internet Protocol) je kao poštanski sistem interneta - njegov jedini posao je da donese paket na pravu adresu. Radi bez uspostavljanja konekcije, što znači da svaki paket putuje nezavisno i može doći različitim putevima.
IP je nepouzdan protokol - ne garantuje da će paket stići, može se izgubiti ili stići van redosleda. Ovo zvuči loše, ali zapravo je genijalno jer omogućava brzinu i fleksibilnost. Ruteri jednostavno čitaju adresu i prosleđuju paket dalje.
Svaki paket dobija zaglavlje sa IP adresom pošaljaoca i primaoca. Ruteri koriste ove informacije da bi znali kuda da pošalju paket na sledećem "skoku" ka odredištu.
💡 Važno za ispit: IP se bavi samo rutiranjem, ne i pouzdanošću - to rade protokoli višeg sloja
TCP vs UDP - dve filozofije prenosa
TCP (Transmission Control Protocol) je kao preporučeno pismo sa povratnicom - sporo, ali sigurno. Uspostavlja konekciju pre slanja, proverava da li su svi paketi stigli i u pravom redosledu. Koristi se za web stranice, email i prenos fajlova.
UDP (User Datagram Protocol) je kao SMS - brzo, bez garancije. Jednostavno "ispaljuje" podatke bez provera. Savršen je za gaming, video pozive i streaming gde je brzina bitnija od toga što se izgubi pokoji paket.
Glavne razlike:
- Pouzdanost: TCP garantuje isporuku, UDP ne
- Brzina: UDP je mnogo brži jer nema provere
- Konekcija: TCP uspostavlja vezu, UDP ne
💡 Za ispit: Poveži TCP sa web browsing-om, a UDP sa online igrama i video pozivima
HTTP/HTTPS - jezik web stranica
HTTP (Hypertext Transfer Protocol) je protokol koji tvoj browser koristi da "razgovara" sa web serverima. Funkcioniše jednostavno - ti pošalješ zahtev (GET za učitavanje stranice, POST za slanje forme), server ti vrati odgovor sa sadržajem.
HTTPS je ista stvar, samo sa dodatnom sigurnošću - svi podaci se šifruju pre slanja. Prepoznaš ga po "https://" u adresi i ikoni katanca u browseru. Obavezno za banking, shopping i sve gde unosiš lične podatke.
FTP (File Transfer Protocol) služi za prenos fajlova između računara. Koristi dve odvojene konekcije - jednu za komande ("hoću da skinem fajl"), drugu za stvarni prenos podataka.
💡 Zapamti: HTTPS nije novi protokol - to je HTTP sa dodalom enkripcijom preko TLS/SSL
DNS - telefonski imenik interneta
DNS (Domain Name System) prevodi imena sajtova u IP adrese koje računari razumeju. Kada ukucaš "instagram.com", DNS sistem pronađe da je to zapravo 31.13.64.51 i omogući tvom browseru da se poveže.
Proces je hijerarhijski - tvoj računar pita lokalni DNS server, koji ako ne zna odgovor, pita dalje u lancu do root servera. Rezultat se čuva (cache) da sledeći put bude brže.
Bez DNS-a morао bi da pamtiš IP adrese svih sajtova koje posećuješ. Umesto "youtube.com" ukucavao bi "172.217.16.14" - praktično nemoguće za korišćenje.
Praktičan primer: Kada otvoriš Instagram, prvo se pošalje DNS upit da se sazna IP adresa, zatim se uspostavlja TCP konekcija, razmenjuju se HTTPS podaci, i konačno vidiš feed.
💡 Za ispit: DNS = "telefonski imenik interneta" - prevodi imena u brojeve
Kako sve funkcioniše zajedno
Kada otvoriš bilo koji sajt, pokreće se cela "koreografija" protokola. DNS prvo pronađe IP adresu, TCP uspostavi stabilnu konekciju, HTTPS osigura da podaci budu šifrovani, a HTTP prenese stvarni sadržaj stranice.
Za video pozive situacija je drugačija - koristi se UDP jer je bitnije da poziv bude u realnom vremenu nego da svaki paket stigne. Ako se izgubi deo zvuka, čuće se kao kratko pucketanje, što je bolje nego kašnjenje celog razgovora.
Ključne razlike za ispit:
- Aplikacioni sloj: HTTP, HTTPS, FTP, DNS
- Transportni sloj: TCP, UDP
- Mrežni sloj: IP
💡 Brzi podsetnik: TCP = pouzdan (web, email), UDP = brz (igre, streaming), IP = rutiranje, DNS = prevođenje imena u adrese
Razumeвање ovih protokola ti pomaže da shvatiš zašto ponekad internet "kaska", zašto su neke aplikacije brže od drugih, i kako tvoji podaci putuju kroz ceo svet za delić sekunde.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Informatika
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Osnovni mrežni protokoli: IP, TCP, UDP, HTTP i više
Mrežni protokoli su kao univerzalni jezik interneta - bez njih tvoj telefon ne bi mogao da pošalje poruku, a ti ne bi mogao da gledaš TikTok ili Instagram. Ovi skupovi pravila omogućavaju svim uređajima da se razumeju i komuniciraju preko... Show more
Osnove mrežnih protokola
Zamišljaj mrežne protokole kao pravila saobraćaja na internetu - svaki uređaj mora da ih poštuje da bi komunikacija funkcionisała. Svaki put kada pošalješ poruku ili otvoriš Instagram, pokreće se ceo lanac protokola koji rade zajedno.
Paket je osnovna jedinica podataka koja putuje kroz mrežu. Tvoja poruka se deli na male delove (pakete), svaki dobija "adresnu nalepnicu" i putuje nezavisno do odredišta. Na kraju se svi paketi sklope nazad u originalnu poruku.
IP adresa je kao poštanska adresa tvog uređaja na internetu. Bez nje, internet ne bi znao gde da ti pošalje podatke. Port je broj koji označava koju aplikaciju na uređaju - dok IP adresa nalazi tvoj telefon, port 443 kaže da podaci idu za Chrome, a ne za Viber.
💡 Zapamti: IP adresa = adresa zgrade, port = broj stana u toj zgradi
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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IP protokol - osnova interneta
IP (Internet Protocol) je kao poštanski sistem interneta - njegov jedini posao je da donese paket na pravu adresu. Radi bez uspostavljanja konekcije, što znači da svaki paket putuje nezavisno i može doći različitim putevima.
IP je nepouzdan protokol - ne garantuje da će paket stići, može se izgubiti ili stići van redosleda. Ovo zvuči loše, ali zapravo je genijalno jer omogućava brzinu i fleksibilnost. Ruteri jednostavno čitaju adresu i prosleđuju paket dalje.
Svaki paket dobija zaglavlje sa IP adresom pošaljaoca i primaoca. Ruteri koriste ove informacije da bi znali kuda da pošalju paket na sledećem "skoku" ka odredištu.
💡 Važno za ispit: IP se bavi samo rutiranjem, ne i pouzdanošću - to rade protokoli višeg sloja
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TCP vs UDP - dve filozofije prenosa
TCP (Transmission Control Protocol) je kao preporučeno pismo sa povratnicom - sporo, ali sigurno. Uspostavlja konekciju pre slanja, proverava da li su svi paketi stigli i u pravom redosledu. Koristi se za web stranice, email i prenos fajlova.
UDP (User Datagram Protocol) je kao SMS - brzo, bez garancije. Jednostavno "ispaljuje" podatke bez provera. Savršen je za gaming, video pozive i streaming gde je brzina bitnija od toga što se izgubi pokoji paket.
Glavne razlike:
- Pouzdanost: TCP garantuje isporuku, UDP ne
- Brzina: UDP je mnogo brži jer nema provere
- Konekcija: TCP uspostavlja vezu, UDP ne
💡 Za ispit: Poveži TCP sa web browsing-om, a UDP sa online igrama i video pozivima
Sign up to see the contentIt's free!
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Join milions of students
HTTP/HTTPS - jezik web stranica
HTTP (Hypertext Transfer Protocol) je protokol koji tvoj browser koristi da "razgovara" sa web serverima. Funkcioniše jednostavno - ti pošalješ zahtev (GET za učitavanje stranice, POST za slanje forme), server ti vrati odgovor sa sadržajem.
HTTPS je ista stvar, samo sa dodatnom sigurnošću - svi podaci se šifruju pre slanja. Prepoznaš ga po "https://" u adresi i ikoni katanca u browseru. Obavezno za banking, shopping i sve gde unosiš lične podatke.
FTP (File Transfer Protocol) služi za prenos fajlova između računara. Koristi dve odvojene konekcije - jednu za komande ("hoću da skinem fajl"), drugu za stvarni prenos podataka.
💡 Zapamti: HTTPS nije novi protokol - to je HTTP sa dodalom enkripcijom preko TLS/SSL
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
DNS - telefonski imenik interneta
DNS (Domain Name System) prevodi imena sajtova u IP adrese koje računari razumeju. Kada ukucaš "instagram.com", DNS sistem pronađe da je to zapravo 31.13.64.51 i omogući tvom browseru da se poveže.
Proces je hijerarhijski - tvoj računar pita lokalni DNS server, koji ako ne zna odgovor, pita dalje u lancu do root servera. Rezultat se čuva (cache) da sledeći put bude brže.
Bez DNS-a morао bi da pamtiš IP adrese svih sajtova koje posećuješ. Umesto "youtube.com" ukucavao bi "172.217.16.14" - praktično nemoguće za korišćenje.
Praktičan primer: Kada otvoriš Instagram, prvo se pošalje DNS upit da se sazna IP adresa, zatim se uspostavlja TCP konekcija, razmenjuju se HTTPS podaci, i konačno vidiš feed.
💡 Za ispit: DNS = "telefonski imenik interneta" - prevodi imena u brojeve
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Kako sve funkcioniše zajedno
Kada otvoriš bilo koji sajt, pokreće se cela "koreografija" protokola. DNS prvo pronađe IP adresu, TCP uspostavi stabilnu konekciju, HTTPS osigura da podaci budu šifrovani, a HTTP prenese stvarni sadržaj stranice.
Za video pozive situacija je drugačija - koristi se UDP jer je bitnije da poziv bude u realnom vremenu nego da svaki paket stigne. Ako se izgubi deo zvuka, čuće se kao kratko pucketanje, što je bolje nego kašnjenje celog razgovora.
Ključne razlike za ispit:
- Aplikacioni sloj: HTTP, HTTPS, FTP, DNS
- Transportni sloj: TCP, UDP
- Mrežni sloj: IP
💡 Brzi podsetnik: TCP = pouzdan (web, email), UDP = brz (igre, streaming), IP = rutiranje, DNS = prevođenje imena u adrese
Razumeвање ovih protokola ti pomaže da shvatiš zašto ponekad internet "kaska", zašto su neke aplikacije brže od drugih, i kako tvoji podaci putuju kroz ceo svet za delić sekunde.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user