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Certified Ethical Hacker (CEH) Practice Question

During a recent audit, you learn that several employees were duped by attackers who telephoned the help-desk posing as corporate IT staff and obtained temporary VPN passwords. Because many users legitimately request assistance after hours, eliminating phone support is not an option. Which single measure would best reduce the effectiveness of this vishing attack without disrupting normal help-desk operations?

  • Enable sticky MAC port security on all access switches to block unregistered devices from connecting.

  • Institute a mandatory call-back procedure that uses the phone number stored in the HR directory before processing any credential-related request.

  • Prohibit password resets outside of normal business hours to limit help-desk exploitation windows.

  • Upgrade the corporate wireless network to WPA3-Enterprise with 802.1X authentication.

Certified Ethical Hacker (CEH)
Network and Perimeter Hacking
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