Core exams on networking systems (all are required)

Exam 70-290
Review the preparation guide for Exam 70-290: Managing and Maintaining a Windows Server 2003 Environment

Exam 70-291
Review the preparation guide for Exam 70-291: Implementing, Managing, and Maintaining a Windows Server 2003 Network Infrastructure

Exam 70-293
Review the preparation guide for Exam 70-293: Planning and Maintaining a Windows Server 2003 Network Infrastructure

Exam 70-294
Review the preparation guide for Exam 70-294: Planning, Implementing, and Maintaining a Windows Server 2003 Active Directory Infrastructure