OSI model in networking? Ethical hacking and its types? ICMP protocol? what is footprinting?

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The interview questions cover OSI model, ethical hacking types, ICMP protocol, and footprinting.

OSI model is a conceptual model that describes how data is transmitted over a network.
Ethical hacking involves using hacking techniques to identify vulnerabilities in a system with the owner's permission.
Types of ethical hacking include network penetration testing, web application testing, and social engineering testing.
ICMP protocol is used for error reporting and diagnostic purposes in IP networks.
Footprinting is the process of gathering information about a target system or network to identify vulnerabilities and potential attack vectors.

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