[Linux-HA] What About The DNS Server

[James Ellis]

I am trying to design a High Availability website.  This is what I am thinking for architecture:
 
Apache Web Server - One server used for load balancing.  A second slave server (inactive) as a failover and Linux HA (Heartbeat) to trigger the failover. 
Cluster of Tomcat Servers - Failover handled by cluster.
MySQL Cluster -  Failover handled by cluster.
 
Two questions:
1) Is the above architecture "standard"?
2) Isn't the DNS server still a single point of failure?  A request comes in for http://www.foo.com which is translated by a DNS server as 192.168.1.1 which maps to the Apache server.  So if the DNS server fails...how would the Apache server ever get the request?  
Your thoughts/help are appreciated.
 
Jim