The answer is Network Access Control (NAC). This is correct because NAC is the security framework that evaluates a device’s compliance—such as antivirus status and patch level—before granting full network access, and it automatically enforces quarantine behavior by placing noncompliant devices into a restricted segment like a quarantine VLAN until they pass a security check. On the Security+ SY0-701 exam, this scenario tests your understanding of how NAC uses protocols like 802.1X or MAC authentication bypass to dynamically assign VLANs based on device posture, often appearing in questions about endpoint compliance and network segmentation. A common trap is confusing NAC with a firewall or IDS, but remember: NAC controls *admission*, not just traffic filtering. Memory tip: “NAC quarantines the sick until they’re clean.”
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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.
A help desk technician receives an alert that an unmanaged laptop was plugged into a conference room network jack and was automatically placed into a restricted network segment until it passed a security check. Which control is responsible for that behavior?
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 (NAC).
Network Access Control (NAC) is the correct answer because it is specifically designed to enforce security policies on devices attempting to connect to a network. When an unmanaged laptop is plugged into a network jack, NAC evaluates the device's compliance (e.g., antivirus status, patch level) and, if it fails, automatically places it into a restricted segment (e.g., a quarantine VLAN) until it passes a security check. This behavior is a core function of NAC solutions like Cisco ISE or Aruba ClearPass, which use 802.1X or MAC authentication bypass to dynamically assign VLANs based on device posture.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 access control (NAC).
Why this is correct
NAC can authenticate devices, check posture, and place noncompliant systems into a limited or quarantine network segment.
Related concept
Read the scenario before looking for a memorised answer.
✗
Data loss prevention (DLP).
Why it's wrong here
DLP monitors data movement and sensitive content, but it does not decide whether a device may join the network.
✗
Intrusion prevention system (IPS).
Why it's wrong here
An IPS can block malicious traffic, but it does not perform device admission control or assign a remediation VLAN.
✗
Sandboxing gateway.
Why it's wrong here
Sandboxing is used to detonate suspicious files or links, not to control network access for endpoint devices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse NAC with an IPS or firewall because both can block traffic, but NAC specifically controls access at the point of network entry (Layer 2) based on device identity and compliance, not by inspecting packet payloads.
Detailed technical explanation
How to think about this question
Under the hood, NAC typically leverages 802.1X (port-based authentication) or MAC Authentication Bypass (MAB) as a fallback. When a device connects, the switch sends a RADIUS request to the NAC policy server, which checks the device's posture via agents or passive scanning (e.g., using Change of Authorization, RFC 5176). If the device is non-compliant, the server sends a RADIUS Access-Accept with a restricted VLAN ID, dynamically reconfiguring the switch port. In real-world scenarios, this prevents rogue devices from accessing sensitive resources while allowing remediation through a captive portal.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Network access control (NAC). — Network Access Control (NAC) is the correct answer because it is specifically designed to enforce security policies on devices attempting to connect to a network. When an unmanaged laptop is plugged into a network jack, NAC evaluates the device's compliance (e.g., antivirus status, patch level) and, if it fails, automatically places it into a restricted segment (e.g., a quarantine VLAN) until it passes a security check. This behavior is a core function of NAC solutions like Cisco ISE or Aruba ClearPass, which use 802.1X or MAC authentication bypass to dynamically assign VLANs based on device posture.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SY0-701 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 SY0-701 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.