What does network security aim to protect?

Network security primarily focuses on safeguarding a computer network from unauthorized access, attacks, and breaches by intruders. The goal is to ensure that the data transmitted over the network is protected from eavesdropping, tampering, and theft. This encompasses a variety of measures, including the implementation of firewalls, intrusion detection systems, and encryption techniques, to secure the network and maintain the confidentiality, integrity, and availability of information.

The other options do not fully align with the primary objectives of network security. While protecting the physical infrastructure is important, it is more aligned with physical security than network security specifically. Devices from electrical failure falls under hardware reliability and maintenance rather than network security. Lastly, data migration to the cloud pertains to data transfer and management issues rather than the protection of a network from unauthorized users or threats.