Anycast

http://en.wikipedia.org/wiki/Anycast
Best Practices in DNS Anycast Service-Provision Architecture
Anycast DNS

Load Balancing Web Applications

All copied from: Load Balancing Web Applications

Why: High availability and Scalability

How:  a) DNS round robin
          b) Hardware load balancers

Advantages of DNS Round Robin
1. Inexpensive
2. Easy to set up

Disadvantages of DNS Round Robin
1. No support for server affinity
2. No support for high availability

Advantages of Hardware Load Balancers
1. Server affinity.
2. High Availability Through Failover

Disadvantages of Hardware Load Balancers
1. Expensive
2. Complicated to setup

Load Balancing HTTPS Requests
1. Web server proxies
2. Hardware SSL decoders