The answer is Network Access Control (NAC) that verifies the device before granting access. This is correct because NAC enforces posture checks—such as verifying antivirus status, patch levels, or endpoint compliance—before allowing a device onto internal resources, and it can dynamically place non-compliant devices like a contractor’s tablet onto a guest VLAN with internet-only access until those checks pass. On the Security+ SY0-701 exam, this scenario tests your understanding of how NAC integrates with 802.1X or MAC authentication bypass to segment traffic based on device health, often appearing as a contrast to simple port security or a firewall rule. A common trap is confusing NAC with a VPN or a captive portal, but remember: NAC is about pre-admission control and dynamic VLAN assignment, not just authentication. Memory tip: think “NAC checks your NACkles before letting you in—guest VLAN is the waiting room.”
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 contractor connects a personal tablet to a lobby Ethernet jack. The network team wants the device blocked from internal resources until it passes posture checks and only guest access is allowed meanwhile. Which control best fits?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 that verifies the device before granting access.
Network Access Control (NAC) is the correct solution because it enforces security policies by checking a device's compliance (e.g., antivirus, patch level) before granting access to internal resources. In this scenario, the contractor's tablet is initially placed on a guest VLAN with internet-only access until posture checks pass, which is a core NAC function (e.g., using 802.1X or MAC authentication bypass).
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.
✗
A data loss prevention platform that inspects file transfers.
Why it's wrong here
DLP helps protect data in motion or at rest, but it does not control device admission to the network.
✓
Network access control that verifies the device before granting access.
Why this is correct
NAC is designed to admit, deny, or segment devices based on identity, posture, and policy before they reach internal resources.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
A network intrusion detection system placed inline at the switch.
Why it's wrong here
IDS is mainly for alerting on suspicious traffic, not for enforcing device admission or guest-only placement.
✗
A VPN concentrator that encrypts remote traffic back to headquarters.
Why it's wrong here
VPNs secure remote connectivity, but they do not decide whether a local device may join the wired network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing NAC with a NIDS or DLP, because candidates often think 'blocking' requires an inline security appliance, but NAC uses switch-level VLAN assignment and 802.1X to enforce policy without inspecting content.
Detailed technical explanation
How to think about this question
NAC typically uses 802.1X with EAP (e.g., EAP-TLS or PEAP) to authenticate devices at the port level, and RADIUS attributes (e.g., Filter-ID or Tunnel-Private-Group-ID) dynamically assign the device to a remediation or guest VLAN. In real-world deployments, a posture agent (e.g., Cisco ISE's AnyConnect) reports OS version, firewall status, and patch level; if the device fails, it is placed in a quarantine VLAN with limited access to update servers.
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 that verifies the device before granting access. — Network Access Control (NAC) is the correct solution because it enforces security policies by checking a device's compliance (e.g., antivirus, patch level) before granting access to internal resources. In this scenario, the contractor's tablet is initially placed on a guest VLAN with internet-only access until posture checks pass, which is a core NAC function (e.g., using 802.1X or MAC authentication bypass).
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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