70-432 : SQL Server 2008 Implementation and Maintenance
You can learn more reading Guide To MCITP: SQL Server 2008 Administration, but the impression I got was that the 70-432 is an exam to test your basic skills and can be handled by even an "accidental DBA" with the right amount of studying and exploration in SQL Server 2008 Developer's Edition


  70-432 is the basic exam and covers a range of general SQL Server
  administration areas. 70-450 is more advanced and covers all the areas
  of 70-432, plus higher-level DBA tasks such as high availability and
  infrastructure design. Be aware that all questions are multiple-choice
  (more on this later).