If you are new and trying to come up to speed and have absolutely no idea of where to start,
then begin your career by going to a library where you can borrow the network related books for free. Start with the basic TCP books as suggested, but then progress to the books called: A+ , Network+ , then CCNA, then CCNP.
At some point you will need to start classes. There is a Network+ class, then take the CCNA class., etc… What you are pursuing is very challenging and interesting. Best of Luck.
I’m from Western Australia and Im an IT Co-Ordinator for a large mining group in Africa. I interview for guys often and they say the same when they are new to the industry. I think its important to have a basic understanding of network fundimentals especially TCP/IP.
In Western Australia you have several REALLY great Uni’s starting with Curtin Uni.
also look at Murdoch Introduction to Networking.
Look at understanding the folowing:
Fundamental Network Characteristics
Types and Sizes of Networks
Network Performance Issues and Concepts
Network Standards and Standards Organizations
Backgrounder: Data Representation and the Mathematics of Computing
There are some great sites on the web so much info can be FREE. I’ve listed some below but search away and you’ll see.