The primary role of a network administrator is to maintain, configure, and manage a computer network within an organization. This includes ensuring network security, performance, and reliability. Network administrators are responsible for troubleshooting connectivity issues, monitoring network traffic, and implementing security measures such as firewalls and intrusion detection systems. They also manage user access controls, software updates, and data backups. Their work is crucial in maintaining seamless communication between systems and ensuring the organization's overall operational efficiency.