TAILIEUCHUNG - Lecture Network security: Chapter 6 - Dr. Munam Ali Shah

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 Summary 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 attack Objectives To be able to distinguish between different types of security attacks To identify and classify which security attacks leads to which security breach category Botnets A virus or worm often doesn’t do any immediate damage in order to stay invisible and spy on users (log keystrokes, steal serial numbers etc.) or add affected machine to a botnet (the machine becomes a bot) Botnet – a network of “owned” machines (bots) controlled usually via IRC protocol or P2P network used to send spam, launch DDoS attacks; also phishing, click fraud, further spread of viruses and worms etc. size: 100, 1000, 10k up to > 1M of nodes access .

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• Network security
• Lecture Network security
• Computer network
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• TCP SYNC flood attack
• Web security
• security rules
• encryption techniques
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• Modern Network Security Threats
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