CAS-004 Security Engineering Practice Question
A security engineer is configuring a web server to use TLS 1.3. Which feature of TLS 1.3 should be disabled to prevent replay attacks in 0-RTT mode?
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
✓
0-RTT
0-RTT data is vulnerable to replay; disabling 0-RTT eliminates this risk. However, the question asks what should be disabled to prevent replay attacks in 0-RTT mode, so the answer is 0-RTT itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
0-RTT
Why this is correct
0-RTT data can be replayed; disabling 0-RTT prevents this.
- ✗
Session resumption
Why it's wrong here
Session resumption in TLS 1.3 uses PSK, but 0-RTT is the specific feature that allows early data and is replayable.
- ✗
Forward secrecy
Why it's wrong here
Forward secrecy is a security feature, not a source of replay.
- ✗
Cipher suite negotiation
Why it's wrong here
Cipher suite negotiation does not directly relate to replay.
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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.