SSCP Network and Communications Security Practice Question
Which network security control can enforce that only authorized devices with current antivirus and patches can connect to the network?
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
✓
Network Access Control
Network Access Control (NAC) enforces security policies by checking device compliance before granting access, typically using 802.1X for authentication and quarantine for non-compliant devices.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Firewall rules
Why it's wrong here
Firewalls filter traffic based on IP/port, not device compliance.
- ✓
Network Access Control
Why this is correct
NAC assesses device health (e.g., antivirus, patches) before allowing network access.
- ✗
Intrusion Prevention System
Why it's wrong here
IPS detects and blocks attacks but does not enforce device compliance.
- ✗
Port security
Why it's wrong here
Port security limits MAC addresses but does not check device posture.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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Same concept, more angles
1 more way this is tested on SSCP
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An organization wants to ensure that only authorized devices can connect to the corporate wired network. Which technology should they implement to enforce this?
medium- ✓ A.Network Access Control (NAC) with 802.1X
- B.VLAN segmentation
- C.MAC address filtering
- D.Firewall rules
Why A: Network Access Control (NAC) with 802.1X authenticates devices before granting network access, enforcing compliance and authorization.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.