CAS-004 Security Architecture Practice Question
A security analyst is investigating an API that uses JSON Web Tokens (JWT) for authentication. Which field in a JWT contains the token expiration time?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
exp
The 'exp' (expiration) claim in the JWT payload specifies the time after which the token is no longer valid, preventing replay attacks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
exp
Why this is correct
exp is expiration time.
- ✗
iss
Why it's wrong here
iss is issuer.
- ✗
iat
Why it's wrong here
iat is issued at.
- ✗
sub
Why it's wrong here
sub is subject.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.