Generally, We covered four aspects which are algorithms, hardware, operating system and network through out the tests. As for me, the most difficult part to memorize and comprehend is computer networks.
There are several types of transmitting information from one machine to another. Token ring, star configuration, bus configuration are three common examples of corporations related to computer networks. Specifically speaking, a token ring network is a local area network (LAN) in which all computers are connected in a ring or star topology and a bit- or token-passing scheme is used in order to prevent the collision of data between two computers that want to send messages at the same time. Compared with token ring, bus configuration is somehow similar with token ring.However, any computer at any time is able to send information to another in the bus configuration network system. Therefore, it seems like a token ring network could do a better job on transmitting because computers(machines) are not able to transmit information without a permission.
Moreover, there is a good CS website to share with you
http://www.bleepingcomputer.com/forums/
