What does the term "network security" refer to?

The term "network security" specifically refers to measures taken to protect a computer network from intruders and various types of cyber threats. This encompasses a wide range of strategies and technologies designed to safeguard the integrity, confidentiality, and availability of data and resources on the network.

Effective network security can include using firewalls, intrusion detection systems, anti-virus software, and encryption techniques to prevent unauthorized access and data breaches. It is about implementing protocols and controls that not only prevent attacks but also respond to them efficiently if they do occur.

In contrast, enhancing network performance, improving network design, and optimizing network usage are related to the efficiency and usability of the network but do not inherently address issues of security. While these aspects may contribute to the overall health and functionality of a network, they do not primarily focus on protecting it from threats, which is the core of network security. Thus, the focus on protecting against intrusions clearly defines the essence of what network security encompasses.