Which of the following is the BEST control for preventing unauthorized device access to an organization's network?

The correct answer is B. Implement network-level authentication and login to regulate access of devices to the network. Network-level authentication (e.g., 802.1X / Network Access Control) is a preventive control that actively blocks unauthorized devices from joining the network by requiring credentials or certificates before granting access. A stateful firewall (A) controls traffic between…

Submitted by saadiq_pk· Apr 18, 2026Information Security Program Development and Management

Question

Options

AInstall a stateful inspection firewall to prevent unauthorized network traffic.
BImplement network-level authentication and login to regulate access of devices to the network.
CEstablish a review schedule for logs from an automated asset inventory discovery tool.
DKeep an inventory of network and hardware addresses of all systems connected to the network.

How the community answered

(46 responses)

A
9% (4)
B
74% (34)
C
13% (6)
D
4% (2)

Explanation

Network-level authentication (e.g., 802.1X / Network Access Control) is a preventive control that actively blocks unauthorized devices from joining the network by requiring credentials or certificates before granting access. A stateful firewall (A) controls traffic between network segments but doesn't stop an unauthorized device from connecting. Log reviews (C) and hardware inventory (D) are detective controls - they identify what is connected but do not prevent unauthorized connections from occurring in the first place.

Topics

#Network Access Control#Device Security#Preventative Controls#Authentication

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