It is important to be able to recognize and name the major components of a PC for the following three reasons: • Computers are important network-building devices. • Many networking devices are themselves special-purpose computers, with many of the same parts as ìnormalî PCs. • For you to view the online curriculum, your own computer must be in working order, which means that you might need to occasionally troubleshoot simple problems in your computerís hardware and software | Cisco Systems Instructor Guide Cisco Networking Academy Program Engineering Journal and Workbook Volume II. Second Edition Cisco Networking Academy Program Engineering Journal and Workbook Volume II Second Edition Engineering Journal and Workbook Questions and Answers Chapter 1 Review The OSI Reference Model and Routing Introduction Networks are complex environments that involve multiple media multiple protocols and interconnections to networks outside an organization s central office. Well-designed and carefully installed networks can reduce the problems associated with growth as a networking environment evolves. Designing building and maintaining a network can be a challenging task. Even a small network that consists of only 50 nodes can pose complex problems that lead to unpredictable results. Large networks that feature thousands of nodes can pose even more complex problems. Despite improvements in equipment performance and media capabilities designing and building a network is difficult. This chapter reviews the Open System Interconnection OSI reference model and overviews network planning and design considerations related to routing. Much of this information should be familiar because you were introduced to these concepts in the first year of the Cisco Networking Academy Program. Using the OSI reference model as a reference for network design can facilitate changes. Using the OSI reference model as a hierarchical structure for network design enables you to design networks in layers. The OSI reference model is at the heart of building and designing networks with every layer performing a specific task in order to promote data communications. In the world of networking Layers 1 through 4 are the focus. These four layers define the following The type and speed of LAN and WAN media to be implemented How data is sent across the media The type of addressing schemes used How data is reliably sent across the network and how flow control is accomplished The type of .
