CCNA : Cisco Certified Network Associate Study Guide, 5th Edition

this not to be true in reality—but remember, we’re studying for the CCNA exam here, right? The Physical Layer. Finally arriving at the bottom, …

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CCNA : Cisco Certified Network Associate Study Guide, 5th Edition
Chapter 1: Internetworking

Copyright (c) 2004 SYBEX Inc., 1151 Marina Village Parkway, Alameda, CA 94501. World rights reserved. No part of this publication may be stored in a retrieval system, transmitted, or reproduced in any way, including but not limited to photocopy, photograph, magnetic or other record, without the prior agreement and written permission of the publisher. ISBN: 0-7821-4391-1 SYBEX and the SYBEX logo are either registered trademarks or trademarks of SYBEX Inc. in the USA and other countries. TRADEMARKS: Sybex has attempted throughout this book to distinguish proprietary trademarks from descriptive terms by following the capitalization style used by the manufacturer. Copyrights and trademarks of all products and services listed or described herein are property of their respective owners and companies. All rules and laws pertaining to said copyrights and trademarks are inferred. This document may contain images, text, trademarks, logos, and/or other material owned by third parties. All rights reserved. Such material may not be copied, distributed, transmitted, or stored without the express, prior, written consent of the owner. The author and publisher have made their best efforts to prepare this book, and the content is based upon final release software whenever possible. Portions of the manuscript may be based upon pre-release versions supplied by software manufacturers. The author and the publisher make no representation or warranties of any kind with regard to the completeness or accuracy of the contents herein and accept no liability of any kind including but not limited to performance, merchantability, fitness for any particular purpose, or any losses or damages of any kind caused or alleged to be caused directly or indirectly from this book. Sybex Inc. 1151 Marina Village Parkway Alameda, CA 94501 U.S.A. Phone: 510-523-8233

TECHNOLOGY Describe network communications using layered models Compare and contrast key characteristics of LAN environments Describe the components of network devices Evaluate rules for packet control

Welcome to the exciting world of internetworking. This first chapter will really help you understand the basics of internetworking by focusing on how to connect networks together using Cisco routers and switches. First, you need to know exactly what an internetwork is, right? You create an internetwork when you take two or more LANs or WANs and connect them via a router, and configure a logical network addressing scheme with a protocol such as IP. I\’ll be covering these four topics in this chapter: Internetworking basics Network segmentation How bridges, switches, and routers are used to physically segment a network How routers are employed to create an internetwork I\’m also going to dissect the Open Systems Interconnection (OSI) model and describe each part to you in detail, because you really need a good grasp of it for the solid foundation you\’ll build your networking knowledge upon. The OSI model has seven hierarchical layers that were developed to enable different networks to communicate reliably between disparate systems. Since this book is centering upon all things CCNA, it\’s crucial for you to understand the OSI model as Cisco sees it, so that\’s how I\’ll be presenting the seven layers of the OSI model to you. Since there\’s a bunch of different types of devices specified at the different layers of the OSI model, it\’s also very important to understand the many types of cables and connectors used for connecting all those devices to a network. We\’ll go over cabling Cisco devices, discussing how to connect to a router or switch along with Ethernet LAN technologies, and even how to connect a router or switch with a console connection. We\’ll finish the chapter by discussing the Cisco three-layer hierarchical model that was developed by Cisco to help you design, implement, and troubleshoot internetworks. After you finish reading this chapter, you\’ll encounter 20 review questions and three written labs. These are given to you to really lock the information from this chapter into your memory. So don\’t skip them!

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