sir, i have completed B.sc Applied Science in 2002 and entered garments field. is am eligible for this course now and get a job in Network

definitely. any recruiter who is going to interview you for a network administrator position, will only be considering you as a fresher. but if you possess MCITP, CCNA, CCNP and Red Hat skills you would definitely get a suitable job. you are aware that the salaries in IT industry are quite good comp