I applied online. I interviewed at Innovis Telecom Services Pvt. (New Delhi) in Mar 2017
Interview
Two technical rounds and last HR round ., technical rounds would be specific about new tech. and scenario based questions on network design and alarm severity check , they ask about basic firewalls settings and DNS lookup
I applied through a staffing agency. I interviewed at Innovis Telecom Services Pvt. (Chennai) in Apr 2017
Interview
was easy to clear the interview, Just know the basic concepts and present well during call.
your experience in previous organizations would help you if you had done well, no separate preparation needed.