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Certified Ethical Hacker (CEH) Practice Question

During a penetration test you overwhelm a Linux web server's TCP port 80 with a flood of spoofed SYN packets using hping3. The attack exhausts the kernel's SYN backlog, preventing legitimate clients from completing the three-way handshake. Without deploying external filtering devices, which single kernel-level adjustment provides the most effective immediate defense against this classic SYN flood technique?

  • Enable TCP SYN cookies (sysctl net.ipv4.tcp_syncookies=1).

  • Shorten the TCP keep-alive interval to close idle sessions sooner.

  • Reduce the interface MTU to 576 bytes to force fragmentation.

  • Disable the TCP timestamp option in the kernel.

Certified Ethical Hacker (CEH)
Network and Perimeter Hacking
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