CAS-004 Security Engineering Practice Question
A security engineer is reviewing a TLS 1.3 configuration. Which of the following is a key feature of TLS 1.3 that improves security compared to earlier versions?
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
✓
Mandatory forward secrecy using ephemeral Diffie-Hellman
TLS 1.3 removes support for insecure cipher suites like CBC mode and RC4, and only supports AEAD ciphers. It also provides forward secrecy by default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Mandatory forward secrecy using ephemeral Diffie-Hellman
Why this is correct
TLS 1.3 requires ephemeral key exchange, ensuring forward secrecy.
- ✗
Support for RC4 cipher suite
Why it's wrong here
RC4 is removed in TLS 1.3 due to weaknesses.
- ✗
Support for static RSA key exchange
Why it's wrong here
Static RSA key exchange is removed in TLS 1.3.
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Ability to downgrade to TLS 1.2
Why it's wrong here
Downgrade is possible but not a security improvement.
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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.