CompTIA Network+ Practice Test 2026 - Free Network+ Practice Questions and Exam Prep Guide

Regularly changing default passwords is a fundamental best practice for enhancing device security. Many devices, especially networked equipment such as routers, switches, and other Internet of Things (IoT) devices, come with factory-set default passwords that are often publicly known or easy to guess. By updating these passwords, you significantly reduce the risk of unauthorized access. Default passwords are a common target for attackers, and failing to change them can leave devices vulnerable to exploitation.

In contrast, keeping all ports open diminishes security, as it creates more entry points for potential threats. Allowing unrestricted physical access to devices poses a significant security risk, as anyone could tamper with or steal the hardware. Finally, enabling maximum access for all MAC addresses does not restrict unauthorized devices from connecting to the network, which could also lead to security breaches. Therefore, changing default passwords is a proactive measure that directly mitigates the risk of unauthorized access and is aligned with best practices in cybersecurity.