From the developer: "The Boson Sun practice tests will prepare you for the actual Sun exam. This includes Sun Certified Java 2 Programmer, System Administrator for Solaris 7 & 8, Sun Network Adminstrator for Solaris 7, and TCP/IP Network Administration for Solaris 8 exams. Each practice exam contains over 200 questions and explanations and has a money-back guarantee.

Each test in this download allows unlimited use of a 12-question database. Registration gives you use of 200+ questions, answers, explanations, and use of flash-card mode."

Note: Registration costs $39.95.