Module 10: Denial-of-Service

Section 1: DoS Concepts

A denial-of-service attack attempts to make a system or network unavailable by overwhelming resources.

Types

• DoS vs DDoS: Single-source vs distributed attacks
• SYN Flood: Sending SYN packets without completing handshake
• UDP/F ICMP Flood: Flooding with unnecessary requests
• Smurf Attack: ICMP amplification via broadcast addresses
• Ping of Death: Oversized/malformed ping packets
• Slowloris: Keeping connections open as long as possible

Application Layer Attacks

HTTP floods, slow POST attacks targeting web applications directly.