Final answer:
The Australian Defence Signals Directorate recommends using intelligence and counterintelligence services, employing civil defense and emergency preparedness measures, and ensuring resilience of critical infrastructure to prevent cyber intrusions.
Step-by-step explanation:
According to the Australian Defence Signals Directorate (DSD), several measures can be implemented to prevent a majority of targeted cyber intrusions. To enhance cybersecurity, they recommend strategies such as the use of intelligence services to defeat external threats, along with employing counterintelligence services to safeguard the nation from internal threats. Furthermore, they emphasize the adoption of civil defense and emergency preparedness measures, which encompasses anti-terrorism legislation and ensuring the resilience of critical national infrastructure.
Additionally, technological surveillance, for instance using drone technology for continuous monitoring, can play a crucial role in the early detection and rapid response to unauthorized activities. The concept relates not only to preserving physical locations from human encroachment but is also relevant in cyberspace where early detection of threats and immediate action is critical to averting cybersecurity incidents.
In summary, a combination of proactive monitoring, robust legislation, and infrastructure resilience, enhances a nation's capability to thwart the efforts of adversaries attempting cyber intrusions, providing a holistic approach to national security and cyber defense.