ISC Infrastructure And System Security Practice Question
Which feature is essential for protecting against 'Credential Stuffing' attacks on an enterprise authentication portal?
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
✓
Implementing Multi-Factor Authentication (MFA).
Multi-Factor Authentication (MFA) is the most effective defense against credential stuffing because compromised passwords alone are insufficient to gain access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Limiting the password character set.
Why it's wrong here
This does not help against automated credential reuse.
- ✓
Implementing Multi-Factor Authentication (MFA).
Why this is correct
MFA is the standard defense against stolen credentials.
- ✗
Increasing the session timeout.
Why it's wrong here
This does not prevent the initial unauthorized login.
- ✗
Implementing a strong password policy.
Why it's wrong here
Attackers ignore password policies because they use stolen credentials.
About these practice questions
One of 208 original ISC practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.