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CAS-004 Practice Question: Implementing a software-defined perimeter (SDP)…
A company is implementing a software-defined perimeter (SDP) architecture. Which TWO of the following are key characteristics of SDP? (Select TWO.)
⚠ Common exam trap
Test-takers frequently confuse SDP's encryption requirement with 'public key cryptography only,' forgetting that SDP uses a hybrid approach (public key for key exchange, symmetric for bulk encryption) and that the defining characteristic is invisibility and device authentication, not the specific encryption algorithm.
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
✓
The infrastructure is invisible to unauthorized users
A core principle of Software-Defined Perimeter (SDP) is to make the infrastructure invisible to unauthorized users. This is achieved by deploying SDP controllers and gateways that hide network components (e.g., servers, IP addresses) from unauthenticated clients, effectively creating a 'black cloud' that only reveals resources after successful authentication and authorization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Network segmentation is implemented via VLANs
Why it's wrong here
SDP segments at the application layer, not Layer 2 VLANs.
- ✓
The infrastructure is invisible to unauthorized users
Why this is correct
SDP uses a black cloud model, hiding assets until authentication.
- ✗
Peering between SDP components is done via BGP
Why it's wrong here
SDP uses a controller-based architecture, not BGP.
- ✗
All communications are encrypted using public key cryptography
Why it's wrong here
Encryption is typical but not a defining characteristic; SDP can use TLS.
- ✓
Device authentication is required before granting network access
Why this is correct
SDP ensures device posture and identity before connecting.
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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.