Here is a quick tip. Memorize the Private TCP/IP address ranges. There will most likely be questions on the certification exams regarding information on RFC-1918 aka the private IP ADDRESSING ranges.
There are 3 blocks of un-routable addresses you can use when designing your networks.
Class A: 10.0.0.0 – 10.255.255.255 (10.0.0.0/8)
Class B: 172.16.0.0 – 172.31.255.255 (172.16.0.0/12)
Class C: 192.168.0.0 – 192.168.255.255 (192.168.0.0/16)
These will help you in the exam when they ask you which is a valid private ip addressing scheme to use within your network.
Beware of the trick questions when they ask what the masks are. I fell part of that trap.
Happy exam taking
RTA