Cisco - Network Consultants Handbook

During the course of a typical day—if there is such a thing as a "typical" day—network consultants are bombarded with questions coming from all directions. These questions come from customers, peers, sales and marketing teams, network administrators, and so on, and the list seems neverending at times. Network consultants, designers, engineers, managers, and so on have developed an instinct over time and sometimes cringe or develop other nervous habits when the phrase, "You got a second?" is uttered. To the uninitiated, this question seems innocent enough, but after a while they, too, develop the same cringe or nervous habit. ...
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Cisco - Network Consultants HandbookNetwork Consultants HandbookAbout the Author.......................................................................................................................................................................... 10 About the Technical Reviewers .................................................................................................................................................. 11Acknowledgments ....................................................................................................................................................................... 12Foreword ...................................................................................................................................................................................... 13Introduction................................................................................................................................................................................... 14 Purpose of This Book................................................................................................................................................................. 16 How This Book Can Be Used ..................................................................................................................................................... 17 The Twelve Networking Truths .................................................................................................................................................. 17 Feedback.................................................................................................................................................................................... 19Chapter 1. Open System Interconnection (OSI) Model ........................................................................................................... 20 OSI Reference Model ................................................................................................................................................................. 20 Summary.................................................................................................................................................................................... 31Chapter 2. LAN Topologies ........................................................................................................................................................ 32 Unicast....................................................................................................................................................................................... 32 Multicast .................................................................................................................................................................................... 33 Broadcast ................................................................................................................................................................................... 34 LAN Addressing ........................................................................................................................................................................ 38 LAN Topologies......................................................................................................................................................................... 39 LAN Topologies......................................................................................................................................................................... 47 Routers....................................................................................................................................................................................... 56 Summary.................................................................................................................................................................................... 56Chapter 3. Ethernet/IEEE 802.3................................................................................................................................................. 58 Ethernet Network Elements ........................................................................................................................................................ 62 Ethernet Network Topologies and Structures .............................................................................................................................. 63 IEEE 802.3 Logical Relationship to the OSI Reference Model ................................................................................................... 65CSMA/CD Operation................................................................................................................................................................... 71 The Ethernet Physical Layers ..................................................................................................................................................... 82 10 Mbps Ethernet Operation....................................................................................................................................................... 83 100 Mbps, or Fast Ethernet......................................................................................................................................................... 92 100VG-AnyLAN........................................................................................................................................................................ 99 1000 Mbps, or Gigabit (Gbps) Ethernet .................................................................................................................................... 104 10 Gbps, or 10 Gigabit Ethernet .............................................................................. ...