If you want to pass your CCNA exam you must have top notch hands on router and switch skills. Almost every job interview includes technical tests on live equipment so you need to be able to configure a router quickly, efficiently and accurately.
Using these hands on labs will give you a massive advantage over other Cisco engineers because you can see what to do along with a full commentary showing you how to avoid the pitfalls that can cost you valuable marks in the exam and potentially job threatening mistakes in the real world.
You can read all of the theory and labs offline when you have your own printed copy of Cisco CCNA Simplified. The book has been used by over 2000 Cisco students to help them study for their CCENT, ICND2 and CCNA exams.