N10-009 Question #187: Real Exam Question with Answer & Explanation

The correct answer is D: NAC. Network Access Control (NAC) is the most comprehensive solution to prevent unauthorized access by visitors plugging into corporate network ports, as it authenticates devices and users before granting network access and can enforce policies.

Submitted by priya_blr· Mar 6, 2026Network Security

Question

A company's office has publicly accessible meeting rooms equipped with network ports. A recent audit revealed that visitors were able to access the corporate network by plugging personal laptops into open network ports. Which of the following should the company implement to prevent this in the future?

Options

AURL filters
BVPN
CACLs
DNAC

Explanation

Network Access Control (NAC) is the most comprehensive solution to prevent unauthorized access by visitors plugging into corporate network ports, as it authenticates devices and users before granting network access and can enforce policies.

Common mistakes.

A. URL filters block access to specific websites and do not control initial network access or authentication for devices.
B. A VPN (Virtual Private Network) provides secure remote access but doesn't prevent unauthorized devices from connecting to a local network port without proper authentication.
C. ACLs (Access Control Lists) can block traffic based on IP addresses or ports, but they do not provide the dynamic authentication and policy enforcement capabilities needed to prevent any unauthorized device from initially connecting.

Concept tested. Network access control and security

Reference. https://www.cisco.com/c/en/us/products/security/network-access-control-nac/index.html

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