Vision Fix offers training via correspondance.
http://www.visionfix.com.au/
CCNA might be a bit much for what you want plus it is more specific to CISCO products. Depends if your network uses CISCO Routers and/or Switches. If you opt to go this way there is the Cisco Certified Entry Networking Technician (CCENT) course. CISCO does have self study packages and most of their reference books are pretty good.
Alternatly you could go for a more generic Network training through CompTia N+.
This all depends on whether you want or need to be certified or whether you just want the knowledge to see you through.