Which network requirement is primarily about protecting the network from unauthorized access?

• A. Security
• B. Fault tolerance
• C. Scalability
• D. Reliability

Answer: (A)

Protecting the network from unauthorized access is a security concern. Security focuses on ensuring that only legitimate users and devices can reach resources by using authentication to verify identities, authorization to grant appropriate rights, and access controls such as firewalls and ACLs, along with encryption and secure management practices. This combination keeps attackers out and protects data and services.

Fault tolerance is about keeping services available even when components fail, using redundancy and recovery strategies. Scalability concerns handling increasing load and growth. Reliability centers on consistent performance and uptime. While those areas support a robust network, they don’t directly address preventing entry, making security the best fit for this requirement.