Certified Ethical Hacker (CEH v11) — Question 278

Mike, a security engineer, was recently hired by BigFox Ltd. The company recently experienced disastrous DoS attacks. The management had instructed Mike to build defensive strategies for the company's IT infrastructure to thwart DoS/DDoS attacks. Mike deployed some countermeasures to handle jamming and scrambling attacks.
What is the countermeasure Mike applied to defend against jamming and scrambling attacks?

Answer options

• A. Allow the transmission of all types of addressed packets at the ISP level
• B. Disable TCP SYN cookie protection
• C. Allow the usage of functions such as gets and strcpy
• D. Implement cognitive radios in the physical layer

Correct answer: D

Explanation

The correct answer is D, as cognitive radios can dynamically adapt their transmission parameters to avoid interference from jamming and scrambling attacks. The other options do not effectively address the specific threats mentioned; for instance, disabling TCP SYN cookies (B) can actually make a system more vulnerable to DoS attacks, while allowing insecure functions (C) poses security risks.