EXPERTInfrastructure
Design a Global DNS System
Design a globally distributed DNS system like Cloudflare or Route 53 that handles billions of queries per day.
Estimated Time: 45 minutes
#DNS#GeoDNS#Caching#Anycast
Solution Overview
Use Anycast for geographic routing. Implement hierarchical caching with TTL-based invalidation. Handle DNS amplification attacks.
Solution Overview
Use Anycast for geographic routing. Implement hierarchical caching with TTL-based invalidation. Handle DNS amplification attacks.
Hints to Get Started
1
How does DNS resolution work?
2
Caching strategies at each level
3
DDoS protection mechanisms
Dns Hierarchy
- •Root servers
- •TLD servers
- •Authoritative servers
- •Recursive resolvers
Optimizations
- •Anycast routing
- •EDNS Client Subnet
- •DNS over HTTPS/TLS