What is network security primarily concerned with?

Network security is primarily focused on the protection of computer networks and the data and services they provide. This includes implementing measures to safeguard against unauthorized access, cyber threats, data breaches, and other vulnerabilities that could compromise the integrity, confidentiality, and availability of network resources.

In addition, network security involves establishing protocols and best practices to ensure that both the network and the data traveling through it remain secure from various types of attacks. This encompasses a wide range of technologies and techniques, such as firewalls, intrusion detection systems, encryption, and secure access controls, aimed at maintaining the overall resilience of the network.

The other options relate to important aspects of networking but do not specifically address the core focus of network security. For instance, managing database systems pertains more to data management than security per se, optimizing network speed is related to performance enhancement, and designing network infrastructure focuses on the physical and logical layout rather than protecting it from threats.