You want a new job - Many times having a CCNA certification on your resum'e will help get your foot in the door to a new company and new opportunities.
New career choice - You are wanting to start a new career and a certification is a great way to allow you to enter in to a new job field.

Most seasoned I.T. professional are well versed at certification exams. For Cisco there is the , CCDA, CCNP, and CCIE, plus numerous CCNA exams including Security, Voice and Storage. Other vendors have certification tests as well. These companies include Microsoft, sun, Oracle, Linux, and Novell.
All of these tests are given at a special facility that is designed to administer the tests in a controlled environment. Nothing can be taken into the testing room while you take your test with the exception of two pieces of paper and a pencil provided by the testing center. Tests are delivered to workstations in the testing room that have been downloaded over the internet to the testing center.
Taking these tests can be very un-nerving. However, passing these tests can be done by anyone. You simply need to invest in the study materials and time to get the job down.