From the developer: "The Boson Sniffer practice tests will prepare you for the actual Sniffer exam. This includes the Troubleshooting with Sniffer Pro Network Analyzer exam, needed for the SCP certification. 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.