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Certified Ethical Hacker (CEH) Practice Question

During an incident-response call, your client's upstream provider reports that its network is being abused to launch a 40-Gbps DNS amplification attack against multiple victims. The malicious traffic carries forged source addresses that are not part of the provider's IP space. As an ethical hacker, which countermeasure should you recommend the ISP implement first to halt the spoofed traffic from leaving its network?

  • Implement BCP38/BCP84 ingress source-address filtering on customer-facing edge routers to block packets with spoofed IP sources.

  • Enable SYN cookies on all public-facing web servers.

  • Disable Path MTU Discovery on perimeter firewalls to reduce fragmentation.

  • Raise the maximum UDP payload size for DNS responses to 4096 bytes.

Certified Ethical Hacker (CEH)
Network and Perimeter Hacking
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