CCNA

Bangalore is the right place to get trained in networking. CCIE is the best among all (CCNA, CCNP and CCIE). It is the most reputed certification course and the professional is paid enough salary. To be a CCIE, you have to be a CCNA, then CCNP and the CCIE. It needs a lot of hard work and dedication. Also, all these certifications have a validity and you have to crack these certifications in a phase of validity.

You must do basic certifications like CCNA and Red Hat certifications. You can probably prefer to do MCA. This can give you better opportunities in the market being a Masters graduate.

It depends on what have you done in Bachelors degree and what was your stream in school?
Assuming you go for MCA, you should not target CCNA as it is the most basic level of certification. You will not gain any price in the market. If you look for CCNP, then it is a real game in knowledge and job. You will get better job, work, and salary. CCIE is the top class certification among all.

A software engineer is a person who applies the principles of software engineering to the design, development, maintenance, testing, and evaluation of the software and systems that make computers or anything containing software work. After MCA if you work in the filed of software engineering, you will be known as Software Engineer. Additional courses or certification will help you to grow in your career as a Software Engineer.

The duration of the course is 7-12 months. Fees depends on the institute and eligibility on none.

Well, you can start with anyone, either of Ethical Hacking or CCNA, since they are different areas but I personally would advise you to know basic networking at least before you go for EH or CCNA.
EH has a very good exposure presently and high demand in job market rather than CCNA.