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If you aim to work at any level and your aims are high than you can.

You had done CCNA (Cisco Certified Network Admin) which is really a good certification course for just 12th pass student.

It is not required that you must have graduation to you can get "JOB" on 12th +CCNA basis too.

Either , if possible you must go for its next level that is CCNP(Cisco Certified Network Progarmmer ) because it has more opportunities than CCNA.

Still , if you cant do that but want a job on CCNA basis than will tell you you have oppotunities like :

~ ~~NOC (Network Operating Engineer) at companies like Idea , Airtel , Vodafone where you will find good option on 12th basis.

~ ~~Network Administrator at any good MNC but that depends on you knowledge .

You need to prepare well for your interviews only it is the procedure of selection in good MNC's or even you can start with any Electronics Company where they hane LAN(Local Area Network),MAN (Metropolitan Area Network) or WAN (Wide Area Network).