Do you know these words? local area network (LAN) wide area network (WAN) client computer work station file server modem network interface card ISDN T-1 line e-mail chatroom closed computer networks password firewall This chapter will cover these important concepts. If you are unfamiliar with most of these terms, click on the lesson button to learn more about them. You can then take a quiz before moving ahead to the next lesson. You can also take the quiz now and see how well you do. If you want to double-check on a definition for a term you think you know first, click on the word or phrase and check it out in the glossary. Then return to this page and either read the lesson or take the quiz. Go to the lesson! Take the quiz!