Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During a post-incident review you learn attackers tunneled shellcode through the perimeter by sending overlapping IP fragments with an artificially low TTL, causing the stateful firewall and a signature-based NIDS to reconstruct different byte streams. Management wants a network-level control that blocks both fragmentation and TTL-manipulation evasions with minimal disruption. Which measure should you recommend?

  • Apply strict egress filtering so only outbound TCP ports 80 and 443 are permitted.

  • Deploy an inline IPS that performs IP defragmentation and header normalization before forwarding traffic to the firewall.

  • Enable TCP intercept or SYN cookie protection to drop half-open connections at the firewall.

  • Lower the router's maximum segment size (MSS) to force external hosts to avoid large packets.

Certified Ethical Hacker (CEH)
Network and Perimeter Hacking
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