@ Ram Harish
Before I answer your question. Let me brief you about Cisco certification purpose. Cisco offer certification for network engineer / consultant/ expert who work on Cisco devices or willing to make career in networking. The emphasis of all these certifications is to test your application skill, which you have learn through your hands on experience from your day today operation. All the certification are hence design keeping the same motto in mind. To crack any of the certification you need to be really versed with Cisco devices and technology.
Recently Cisco started different CCNA and CCNP stream in different technology like Route switch , Security , Voice , Wireless . Other reason to start such certification is to help people who are planning for expert level certification (CCIE). Now lets get back to your question.
From where you will get syllabus ,Examination fee and other information regarding exam ?
You can go to cisco website : http://www.cisco.com...paths_home.html
You will get all the information from here. Just spend few hour .
Which stream should we prefer Voice vs Wireless ?
I will prefer stream that help me in my career growth . Choose the stream which will help you in your career with your existing employer or future employer . As per Indian market RnS is most demanding cert in market, Voice and security follows . These day Vmware certified professional are in demand because of cloud and data center boom. Wireless has big demand in US, Canada . On the other hand love for technology is purely personal choice.
There is no shortcut to success. All stream will give your success and growth opportunity if you are passionate about your work and knowledge.