CCNA

Hello Shubham,
Yes, you can pursue CCNA after completing BCA.

Hello Manju,
You can go CCNA as you may have seen that this is announced by the CISCO which is designed under cloud computing. This is an excellent introduction to the IP Networking and the technologies underlying at this time. This course is reasonably good platform to begin learning networking.

Hello Manju,
It is a kind of certification which acts as a job role focused certification and training program that helps Cloud engineers, Cloud Administrators, and Network Engineers to develop, advance, and validate their cloud skill set, and enables them to help their IT organization meet changing business demands from technology transitions.

Yes, it will be very good for your career growth. Hence, I would say that your course will help you to excel in your career, but then just take care you acquired too much domain knowledge towards your field. All the best.

Yes, you can pursue but you need to have basic computer knowledge.

Hello,
Yes, you may if these are in the list of short skills in Canada & Australia. You are highly recommended to have some related advance course in either of the 3 countries you mentioned as diplomas or degrees to get acquainted with education experience of the respective countries to acquire necessary skills needed for performing the job in the same field. Once you have some level of education in either country, it will help you to get easier acceptance in respective job fields.