To answer correctly, just read carefully but don't spent too much time on them.
Terminology is important.
Basic knowledge of all communication devices is a must. And it helps if you have working experience with any special network tools. But no question on wireless technology. I took the test and they did not ask for that much detail on the 802.x specifications. I found that the biggest things are to understand routers, switches, hubs and wiring systems, and to understand what causes network traffic problems and how you can reduce traffic.