Cloud network security focuses on securing network traffic, connectivity, and communications within and between cloud environments. It involves firewalls, secure gateways, zero-trust architectures, intrusion detection systems, and encrypted connections to prevent unauthorised access. In Australia, cloud network security must support compliance with ACSC Essential Eight controls and industry-specific regulations. As hybrid and multi-cloud environments become common, cloud network security ensures consistent visibility and protection across distributed systems. Advanced monitoring tools detect anomalous behaviour and reduce exposure to lateral movement attacks. Effective cloud network security strengthens organisational resilience, protects sensitive Australian data assets, and ensures regulatory alignment in highly regulated industries such as finance, healthcare, and government.