Quick Answer
The answer is Okta, because it supports Time-based One-Time Password (TOTP) as an authentication factor, which is the standard method used by authenticator apps like Google Authenticator or Microsoft Authenticator. TOTP generates a temporary code based on a shared secret and the current time, as defined in RFC 6238, and Okta’s multifactor authentication (MFA) policies can require this OTP for user login. On the HashiCorp Vault Associate VA-003 exam, this question tests your understanding of which external identity provider natively supports TOTP as an authentication method for Vault, distinguishing Okta from options like LDAP or GitHub that do not generate time-based codes. A common trap is confusing Okta’s primary role as an SSO provider with its specific TOTP capability—remember that Okta’s MFA engine directly handles the authenticator app OTP flow, while other methods rely on separate token systems. Memory tip: “Okta OTP” both start with O, and TOTP is the time-based code your authenticator app shows.
This VA-003 practice question tests your understanding of compare authentication methods. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which authentication method allows a user to authenticate using a one-time password (OTP) generated by an authenticator app?
Okta
Okta supports TOTP via the Okta API.
Userpass
Why wrong: Userpass does not support OTP.
GitHub
Why wrong: GitHub does not support OTP for Vault auth.
LDAP
Why wrong: LDAP does not natively support OTP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Okta
Okta supports Time-based One-Time Password (TOTP) as an authentication factor, which is the standard method used by authenticator apps like Google Authenticator or Microsoft Authenticator. TOTP generates a temporary code based on a shared secret and the current time, as defined in RFC 6238, and Okta's multifactor authentication (MFA) policies can require this OTP for user login. This makes Okta the correct choice for authenticating with an OTP from an authenticator app.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Okta
Why this is correct
Okta supports TOTP via the Okta API.
Related concept
Read the scenario before looking for a memorised answer.
Userpass
Why it's wrong here
Userpass does not support OTP.
GitHub
Why it's wrong here
GitHub does not support OTP for Vault auth.
LDAP
Why it's wrong here
LDAP does not natively support OTP.
Common exam traps
HashiCorp often tests the distinction between an authentication method (like Okta's TOTP) and a protocol or service that can be used as an identity provider but does not natively generate OTPs, leading candidates to confuse GitHub's OAuth or LDAP's directory lookups with actual OTP generation.
Detailed technical explanation
TOTP works by combining a pre-shared secret key with the current Unix time divided into 30-second intervals, then hashing the result with HMAC-SHA1 to produce a 6-8 digit code. Okta implements this via its RADIUS or SAML integrations, and the authenticator app stores the secret seed (often encoded as a QR code) locally; the server and client must have synchronized clocks (within a few seconds) for the OTP to match. In real-world scenarios, Okta's adaptive MFA can enforce TOTP only for high-risk logins, reducing friction while maintaining security.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the VA-003 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Compare authentication methods — This question tests Compare authentication methods — Read the scenario before looking for a memorised answer..
The correct answer is: Okta — Okta supports Time-based One-Time Password (TOTP) as an authentication factor, which is the standard method used by authenticator apps like Google Authenticator or Microsoft Authenticator. TOTP generates a temporary code based on a shared secret and the current time, as defined in RFC 6238, and Okta's multifactor authentication (MFA) policies can require this OTP for user login. This makes Okta the correct choice for authenticating with an OTP from an authenticator app.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This VA-003 practice question is part of Courseiva's free HashiCorp certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VA-003 exam.
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