First you will be asked to enter your personal details, Educational Qualifications , job position applying for ,Salary expectation etc. in Form. after that there will be C test (written). then technical interview on C,linux,networking. Questions will be very basic. They wont expect you having high knowledge because the ones who will interview you are also not that knowledged . so be cool , it is enough having sound fundamentals.
C: pointers ,strings,arrays
Linux : signals ,IPC, Process Mgmt.,
expected : having worked with make file.
Networking : Layer2 EThernet ,Networking basics.