Quick Answer
The correct answer is IEEE 802.1X port-based authentication because it enforces per-session, dynamic access control at the network edge, authenticating each device via an authentication server like RADIUS before it can communicate on the wired LAN. This prevents unauthorized devices from connecting by verifying credentials or certificates, unlike static MAC address filtering which is easily spoofed. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of network access control (NAC) and the distinction between Layer 2 port security and 802.1X’s robust, standards-based authentication. A common trap is choosing MAC filtering, but remember: 802.1X uses Extensible Authentication Protocol (EAP) to provide cryptographic, per-session validation that cannot be bypassed by simply cloning a MAC address. Memory tip: think “X marks the spot” — 802.1X authenticates at the exact port where the device plugs in.
This SSCP practice question tests your understanding of network and communications security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization wants to prevent unauthorized devices from connecting to its wired network. Which security control should be implemented?
Port security with sticky MAC
Why wrong: Port security limits MAC addresses but can be bypassed by spoofing.
MAC address filtering
Why wrong: MAC addresses can be spoofed, providing weak security.
VLAN segmentation
Why wrong: VLANs segment traffic but do not prevent unauthorized connection.
IEEE 802.1X port-based authentication
802.1X authenticates devices at the port level before allowing network access.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
IEEE 802.1X port-based authentication
IEEE 802.1X port-based authentication is the correct control because it authenticates each device at the network edge before granting access to the wired LAN. It uses an authentication server (e.g., RADIUS) to verify credentials or certificates, effectively preventing unauthorized devices from connecting. Unlike MAC-based controls, 802.1X provides dynamic, per-session authentication that cannot be easily spoofed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Port security with sticky MAC
Why it's wrong here
Port security limits MAC addresses but can be bypassed by spoofing.
MAC address filtering
Why it's wrong here
MAC addresses can be spoofed, providing weak security.
VLAN segmentation
Why it's wrong here
VLANs segment traffic but do not prevent unauthorized connection.
IEEE 802.1X port-based authentication
Why this is correct
802.1X authenticates devices at the port level before allowing network access.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
ISC2 often tests the misconception that MAC-based controls (port security or MAC filtering) provide strong authentication, when in fact they are easily bypassed by MAC spoofing, whereas 802.1X uses cryptographic credentials or certificates for true device authentication.
Detailed technical explanation
802.1X operates at the port level using EAP over LAN (EAPoL) to encapsulate authentication messages between the supplicant (device), authenticator (switch), and authentication server (RADIUS). The switch places the port in an unauthorized state until successful authentication, blocking all traffic except EAPoL frames. In a real-world scenario, 802.1X can be combined with MAB (MAC Authentication Bypass) for legacy devices that do not support 802.1X, but this introduces a fallback that can be exploited if not carefully configured.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
The correct answer is: IEEE 802.1X port-based authentication — IEEE 802.1X port-based authentication is the correct control because it authenticates each device at the network edge before granting access to the wired LAN. It uses an authentication server (e.g., RADIUS) to verify credentials or certificates, effectively preventing unauthorized devices from connecting. Unlike MAC-based controls, 802.1X provides dynamic, per-session authentication that cannot be easily spoofed.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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