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3. OSI Model, TCP/IP Model, TCP vs UDP and the 3-Way Handshake

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Chala mitrano, aaj aapan networking cha "map" shikuya – OSI aani TCP/IP models. Production madhe kahi bighadla ki changla engineer ghabrat nahi, to layer-by-layer check karto. Security madhe pan tasech – firewall kontya layer var kaam karto, WAF kontya layer var, Wireshark madhe kontya layer cha header disto – he sagla ya chapter nantar ekdum clear hoil. Ghabru naka, majhya sobat raha.

What you will learn in this chapter

  • The seven OSI layers, their PDUs, protocols and devices
  • Encapsulation (आवरण घालणे) and decapsulation
  • The four-layer TCP/IP model and how it maps to OSI
  • TCP vs UDP, and when each is used
  • The TCP 3-way handshake, TCP flags and connection close
  • What happens when you open a website – the favourite interview question

Concepts in this chapter

  1. 3.1The Seven OSI Layers
  2. 3.2Encapsulation and Decapsulation
  3. 3.3The TCP/IP Model and OSI Comparison
  4. 3.4TCP vs UDP
  5. 3.5The TCP 3-Way Handshake, TCP Flags and Connection Close
  6. 3.6What Happens When You Open a Website?

The chapter recap is at the end of the last concept page.