how to prepare for CCNA Security

I have been going through the cisco press book by Watkins and Wallace. But I am finding it difficult to remember the commands. I dont have access to regular routers and dont have a simulator as well. Cant practice or remember all the commands .
Could anyone who is preparing for or given the exam let me know what path should i take.
Appreciate all the advice.
Could anyone who is preparing for or given the exam let me know what path should i take.
Appreciate all the advice.
Comments
As far as commands, it doesn't ask much but you will need to know where in the SDM to go in order to configure or find information to answer some of the questions.
Hope that helps.
appreciate your help....I shall have a look at the GNS3 ...
Both.
So do I need to know all the commands in the cisco press book ????.I really dont have a on hands experince on the commands or the SDM
Cisco Security Device Manager Multimedia Demo [Cisco Router and Security Device Manager] - Cisco Systems