Introduction: The Global Presence
Normally, one IP address belongs to one machine. But for critical services like **DNS**, we need something stronger. We use IP Anycast. This allows dozens of servers all over the world to share the exact same IP address (like 8.8.8.8).
The Shield against Attacks
Anycast is a 'Tank' for security. If a hacker tries to DDoS an Anycast IP, the attack traffic is automatically split up and 'soaked up' by 100 different servers instead of hitting just one. This makes it nearly impossible to 'Take Down' the global DNS system.
Conclusion
Anycast is the elite performance strategy of the web. It ensures that the world's most important services are always close by and always online. Check your DNS latency here.