CAS-004 Security Engineering Practice Question
A security engineer is configuring a TLS 1.3 connection between a web server and client. Which feature is unique to TLS 1.3 and provides reduced latency for returning clients?
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
TLS 1.3 includes a 0-RTT (zero round-trip time) feature that allows a client to send data immediately with the first message to a server it has previously connected to, reducing latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cipher suite negotiation
Why it's wrong here
Cipher suite negotiation is present in all TLS versions.
- ✓
0-RTT
Why this is correct
0-RTT is a feature introduced in TLS 1.3 that allows a client to send data in the first message, reducing latency for returning clients.
- ✗
Forward secrecy
Why it's wrong here
Forward secrecy is available in TLS 1.2 as well, not unique to TLS 1.3.
- ✗
Mutual authentication
Why it's wrong here
Mutual authentication is supported in previous TLS versions.
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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.