Which of the following is an essential step in network security?

Updating software regularly is an essential step in network security because it helps protect systems from vulnerabilities that could be exploited by attackers. Software updates frequently include patches that address security flaws, fix bugs, and enhance performance. Keeping software up to date ensures that your systems are protected against known threats and reduces the risk of breaches, data loss, or unauthorized access. With cyber threats constantly evolving, timely updates are crucial for maintaining a strong security posture.

Other options, while they may have relevance in specific contexts, do not contribute as fundamentally to the overall network security strategy. Using a single user account can actually limit access control and differentiation of responsibilities. Disabling encryption protocols undermines the confidentiality and integrity of data, exposing it to unauthorized access. Restricting network access is important but should be a part of a broader strategy that includes regular updates to safeguard systems effectively.