A company with a bring-your-own-device (BYOD) policy requires employees to enable two-factor authentication (2FA) before they can access corporate email and applications from their mobile devices. Which method BEST meets this security requirement?
Verify users solely through security questions.
Use an authenticator app that generates time-based one-time passwords.
Require employees to enter codes sent via SMS text message.
Protect each device with a fingerprint scanner only.
Using an authenticator app that generates time-based one-time passwords (TOTPs) combines something the user knows (their regular credentials) with something they have (the enrolled device). Unlike SMS codes, TOTPs are not exposed to SIM-swap or message-interception attacks and continue to work even when the phone has no cellular or Wi-Fi signal. Fingerprint-only, security-question-only, or SMS-based approaches either provide just a single factor or rely on a weaker channel, so they do not meet the company's stated 2FA standard.
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CompTIA A+ 220-1101 (V14)
Mobile Devices
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