Lesson 5

Network Security


  • All Topics
  • Network Security Basics

    1 Role of each layer in TCP/IP suite

    Before we study the vulnerabilities in TCP/IP, we should know a bit about the layers and it's functions.


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    2 Transport Layer: Three-way handshake

    Transport Layer

    Protocols used: TCP (connection-oriented), UDP (connectionless)


    How three-way handshake work?

    1. The source (client) sends an SYN packet to the destination system (server/host)
    2. The destination system replies with an SY packet & acknowledges the source system’s SYN ...
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