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Every country in the world has many different critical infrastructures such as electronic communication, energy, banking and finance, critical public services, transportation and water management which are of great importance. Each country has different strategies for sector-based critical infrastructure. Especially today, it is vital to protect these critical infrastructures from cyber-attacks. This paper examines the attacks on critical infrastructures, especially in recent years, and presents the most common attacks. Furthermore, security approaches to mitigate or prevent IP-based cyber attacks are mentioned.