Add details about load balancers and firewalls

This public release explains the role that load balancers and firewalls play in the mobile browser web access process. This gives more background information on the infrastructure that facilitates connectivity.

alterations

Additional load balancing between web servers and browsers
An IP address for a load balancer in front of the web servers is returned when a DNS search is performed to obtain Google's servers.
More information on firewall roles The load balancer receives the requests and divides the traffic among Google's several web servers.
The architecture of the mobile provider may include firewalls that analyze traffic and ban content. Google's datacenters keep strictly regulated firewalls to filter harmful requests while permitting legitimate traffic.
These enhancements provide a clearer understanding.