Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During a security audit you confirm that external users can run an unrestricted "dig axfr" against the company's Internet-facing DNS server and obtain a full list of host records. To implement an effective footprinting countermeasure while keeping normal name resolution intact, which change should you make on the authoritative server?

  • Disable recursive queries on the authoritative name server.

  • Replace A records with CNAME aliases and move DNS service to TCP port 8053.

  • Enable DNSSEC signing for the public zone to authenticate responses.

  • Permit zone transfers solely to trusted secondary DNS servers using an IP ACL or TSIG authentication.

Certified Ethical Hacker (CEH)
Reconnaissance Techniques
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