The practice exams for CCNA security have been revised. Checkout the following url:
http://www.simulationexams.com/exam-details/ccna-security.htme
The update includes additional questions added to the question database, and explanations being revised for greater clarity.
You may download the free trial from the link given below:
http://www.simulationexams.com/downloads/cisco-tests/security/ccna-security.htm
The practice tests consists of 300+ questions with answers. The download is free with 30 questions. Full version will have uto 300 questions with flash card answers.