Allan Johnson entered the academic world in 1999 after ten years as a business owner/operator to dedicate his efforts to his passion for teaching. He holds both an MBA and an M.Ed. in Occupational Training and Development. He is an information technology instructor at Del Mar College in Corpus Christi, Texas. In 2003, Allan began to commit much of his time and energy to the CCNA Instructional Support Team, providing services to Networking Academy instructors worldwide and creating training materials. He now works full-time for Cisco Networking Academy as a learning systems developer.
Introduction xx
Chapter 1 Introduction to Scaling Networks 1
Objectives 1
Key Terms 1
Introduction (1.0.1.1) 3
Implementing a Network Design (1.1) 3
Hierarchical Network Design (1.1.1) 3
The Need to Scale the Network (1.1.1.1) 3
Enterprise Business Devices (1.1.1.2) 5
Hierarchical Network Design (1.1.1.3) 6
Cisco Enterprise Architecture (1.1.1.4) 7
Failure Domains (1.1.1.5) 9
Expanding the Network (1.1.2) 11
Design for Scalability (1.1.2.1) 11
Planning for Redundancy (1.1.2.2) 12
Increasing Bandwidth (1.1.2.3) 13
Expanding the Access Layer (1.1.2.4) 14
Fine-tuning Routing Protocols (1.1.2.5) 15
Selecting Network Devices (1.2) 18
Switch Hardware (1.2.1) 18
Switch Platforms (1.2.1.1) 18
Port Density (1.2.1.2) 21
Forwarding Rates (1.2.1.3) 22
Power over Ethernet (1.2.1.4) 23
Multilayer Switching (1.2.1.5) 25
Router Hardware (1.2.2) 26
Router Requirements (1.2.2.1) 26
Cisco Routers (1.2.2.2) 28
Router Hardware (1.2.2.3) 29
Managing Devices (1.2.3) 30
Managing IOS Files and Licensing (1.2.3.1) 30
In-Band Versus Out-of-Band Management (1.2.3.2) 30
Basic Router CLI Commands (1.2.3.3) 31
Basic Router show Commands (1.2.3.4) 34
Basic Switch CLI Commands (1.2.3.5) 39
Basic Switch show Commands (1.2.3.6) 40
Summary (1.3) 44
Practice 45
Class Activities 45
Labs 45
Packet Tracer Activities 45
Check Your Understanding Questions 46
Chapter 2 LAN Redundancy 49
Objectives 49
Key Terms 49
Introduction (2.0.1.1) 51
Spanning Tree Concepts (2.1) 52
Purpose of Spanning Tree (2.1.1) 52
Redundancy at OSI Layers 1 and 2 (2.1.1.1) 52
Issues with Layer 1 Redundancy: MAC Database Instability (2.1.1.2) 54
Issues with Layer 1 Redundancy: Broadcast Storms (2.1.1.3) 56
Issues with Layer 1 Redundancy: Duplicate Unicast Frames (2.1.1.4) 57
STP Operation (2.1.2) 59
Spanning Tree Algorithm: Introduction (2.1.2.1) 59
Spanning Tree Algorithm: Port Roles (2.1.2.2) 61
Spanning Tree Algorithm: Root Bridge (2.1.2.3) 63
Spanning Tree Algorithm: Path Cost (2.1.2.4) 64
802.1D BPDU Frame Format (2.1.2.5) 67
BPDU Propagation and Process (2.1.2.6) 68
Extended System ID (2.1.2.7) 74
Varieties of Spanning Tree Protocols (2.2) 77
Overview (2.2.1) 77
List of Spanning Tree Protocols (2.2.1.1) 78
Characteristics of the Spanning Tree Protocols (2.2.1.2) 79
PVST+ (2.2.2) 80
Overview of PVST+ (2.2.2.1) 80
Port States...