🧠 System Design Fundamentals 5: ✅ TCP, UPD, TLS, HTTP, HTTPS, WebSocket, gRPC | OSI Layers Explained

#interviewWithBunny #systemdesign How do clients and servers actually communicate over a network? In this video from the *System Design Fundamentals* series, we will understand the most important networking protocols used in system design by connecting **OSI Layer 3, Layer 4, and Layer 7**. We will follow the complete communication flow—from finding and addressing a server to establishing a connection, securing it, and exchanging application data. Topics covered in this video ✅ OSI Layer 3, Layer 4, and Layer 7 ✅ How clients and servers communicate ✅ Network Layer and IP addressing ✅ IPv4 and IPv6 basics ✅ Transport Layer explained ✅ TCP — Transmission Control Protocol ✅ TCP 3-way handshake: SYN, SYN-ACK, and ACK ✅ TCP acknowledgements, reliability, ordering, and retransmission ✅ UDP and connectionless communication ✅ TCP vs UDP ✅ TLS handshake and certificate verification ✅ HTTP request-response communication ✅ HTTP methods and status codes ✅ HTTPS — HTTP over TLS ✅ HTTP vs HTTPS ✅ WebSocket handshake and HTTP Upgrade ✅ Persistent bidirectional communication ✅ WebSocket ping and pong heartbeat ✅ gRPC and service-to-service communication ✅ QUIC and HTTP/3 basics ✅ Client-to-server and server-to-server communication The concepts are explained using a simple real-life office analogy, so you can understand the complete networking flow without memorizing complicated definitions. The complete communication flow DNS resolves the domain name into an IP address. Layer 3 helps route packets toward the destination IP. Layer 4 decides how the data should be transported using protocols such as TCP, UDP, or QUIC. TLS creates a secure encrypted connection. Layer 7 protocols such as HTTP, HTTPS, WebSocket, and gRPC define how applications exchange information. If you found this tutorial helpful, please LIKE, COMMENT, and SUBSCRIBE for more in-depth tutorials on LeetCode problems, graph algorithms, and coding interview preparation! Don’t forget to hit the BELL ICON to stay updated on our latest videos. 🚀 ►► Social Connect: LinkedIn:   / anindya-sankar-dasgupta-39a315ba   Facebook:   / technicalinterview03   Instagram:   / anindya_bunny   Keywords: http in computer networks, http protocol, http protocol in computer networks, http protocol explained, http, http protocol in detail, http message, world wide web, what is http protocol, application layer protocol, http explained, hypertext transfer protocol, http protocol request and response, http request message, Hypertext transfer protocol http, http protocol tutorial, Www, Http request, what is http protocol what is https,what is ssl, how SSL works, Secure Socket Layer, Transport Layer Security, SSL vs TLS, What is TLS, HTTP,HTTPS, HTTPvsHTTPS, Which is better http or https, https vs https for beginners,h ttp/https explained, SSL explained,what is ssl certificate, how https works, secure socket layer,transport layer security,difference between http and https