2 Chapter 2. Network layers and protocols review Objective: As a network administrator, you must have a general knowledge of network layers, the protocols at each layer, and the hardware that facilitates the transport of data. This chapter functions as a overview for readers already familiar with IP-related layers and protocols. After completing this chapter, you will be able to: Describe the network layers and their protocols. Describe the characteristics of local area networks and wide area networks. Define hubs, switches, routers, gateways, and secure gateways. List upper layer protocols. If you are already comfortable with the terms associated with these topics, then you can bypass this chapter. © Copyright IBM Corp. 2006. All rights reserved. 23