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The topics discussed in this chapter are botnets, more discussion on DoS attacks, cost of a DoS attacks, ICMP echo datagrams, TCP 3-way handshake, TCP SYNC flood attack. After studying this chapter you will be able to distinguish between different types of security attacks, identify and classify which security attacks leads to which security breach category. | Network Security Lecture 6 Presented by Dr. Munam Ali Shah Sum mary of the previous lecture We discussed different types of security attacks We looked how viruses worms and Trojan can be harmful for a computing environment. Outlines Botnets More discussion on DoS attacks Cost of a DoS attacks ICMP Echo Datagrams TCP 3-Way Handshake TCP SYNC Flood .