Network Security is a set of measures designed to protect the integrity, confidentiality, and accessibility of computer networks. Coursera's Network Security catalogue teaches you the fundamentals of designing, implementing, and managing secure networks. You'll learn about the different types of intrusions, attacks, and threats to network security, and how to defend against them using firewalls, intrusion detection systems, and encryption technologies. Additionally, you will gain an understanding of secure network architectures, VPNs, wireless network security, and the importance of network security policies. This skill is crucial for roles such as network administrators, security analysts, and cybersecurity professionals.