The vast majority of network engineers don't understand TCP/IP. Embarrassing but true. If I had a dollar for every IT guy who has asked me the port number for www I would have 80 dollars by now. Please save yourself the embarrassment of not knowing how to write an access list or configure a pix because you don't know which ports to permit or deny.

Every network in the world is built on TCP/IP so do yourself a favour and learn it. You only have to do it once and now is a good a time as any.