In the field of IT security, the concept of defense in depth is the layering of more than one control on another. Why is this?

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Certified Ethical Hacker (CEH) v9 Study Guide Questions — practice the complete quiz, review flashcards, or try a random question.

The CEH exam is a 125-question multiple-choice exam. Candidates have four hours to complete the CEH exam.
Common CEH exam topics covered include: hacking methodologies, scanning methodologies, port scan types, and expected return responses. 
Knowing how to work with tools such as Nmap, Wireshark, Snort, OpenSSL, Netstat, and Hping will be handy.


In the field of IT security, the concept of defense in depth is the layering of more than one control on another. Why is this?