263111 - This is the code is on SOL & CSOL. Permit for apply visa sub-class either 189 (independent applicants) or 190 (sponsorship applicants)
263212 - This is the code is only on CSOL, so, Permit for apply visa sub-class either 190 (sponsorship applicants)
If you trying for 189 visa, then you need to focus on 263111 code.
Ref:
http://www.acs.org.au/migration-skills-assessment/information-for-applicants
To find job scope of each code please refer below.
http://www.abs.gov.au/ausstats/abs@.nsf/Product+Lookup/1220.0~First+Edition,+Revision+1~Chapter~UNIT+GROUP+2631+Computer+Network+Professionals