Does your company use Cisco routers? If yes then go for CCNA because it will help you to get the hands-on experience. Otherwise, just Google it and read for your information. It is no point having a Cisco certification if you don't apply the knowledge you have learned. Even if you apply for jobs and state that you have a Cisco certification, the employers want to see whether you have used the CCNA knowledge in your previous working place. But, this is just my opinion and the choice is in your hands.

I don't say it is useless as it helps you to gain the skills and knowledge which you could apply in your job. However, it would be advantageous if the company happens to use Cisco routers and switches.