- Networking basics. This will help you understand the underlying equipment used in building a network. This will include everything from routers, hubs, switches and firewalls.
- TCP/IP networking protocol. This is the standard with which most computers communicate with one another across a network. This will also educate you on the basic application services provided by the networking team like Domain Name Service (DNS) and Dynamic Host Configuration Protocol (DHCP).
- Simple Network Management Protocol (SNMP). This is the method most commonly used for accessing management data in a ubiquitous manner across all manner of networking devices.
If self-study is not your preferred methodology, you might consider taking a networking certification class for one of the more prominent networking hardware vendors. This will not only give you the networking knowledge, but also some credibility in the industry. Search for "network certification" on the web, and you will find numerous courses and training companies.
There is also a great networking FAQ on this site that gives an overview of the basics.
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