Introduction xxxvi
Part I General Network Design
Chapter 1 Network Design Methodology 3
Do I Know This Already? Quiz 3
Foundation Topics 6
Cisco Architectures for the Enterprise 6
Borderless Networks Architecture 7
Collaboration and Video Architecture 8
Data Center and Virtualization Architecture 8
Cisco Design Lifecycle: Plan, Build, Manage 9
Plan Phase 10
Build Phase 11
Manage Phase 11
Prepare, Plan, Design, Implement, Operate, and Optimize Phases 12
Prepare Phase 14
Plan Phase 14
Design Phase 14
Implement Phase 15
Operate Phase 15
Optimize Phase 15
Summary of PPDIOO Phases 15
Project Deliverables 16
Design Methodology 16
Identifying Customer Design Requirements 17
Characterizing the Existing Network 18
Steps in Gathering Information 19
Network Audit Tools 19
Network Checklist 23
Designing the Network Topology and Solutions 24
Top-Down Approach 24
Pilot and Prototype Tests 25
Design Document 25
References and Recommended Reading 26
Exam Preparation Tasks 28
Review All Key Topics 28
Complete Tables and Lists from Memory 28
Define Key Terms 28
Q&A 28
Chapter 2 Network Design Models 39
Do I Know This Already? Quiz 39
Foundation Topics 41
Hierarchical Network Models 41
Benefits of the Hierarchical Model 41
Hierarchical Network Design 42
Hierarchical Model Examples 46
Hub-and-Spoke Design 48
Collapsed Core Design 49
Cisco Enterprise Architecture Model 49
Enterprise Campus Module 50
Enterprise Edge Area 52
Service Provider Edge Module 56
Remote Modules 57
High Availability Network Services 59
Workstation-to-Router Redundancy and LAN High Availability Protocols 60
Server Redundancy 62
Route Redundancy 63
Link Media Redundancy 65
References and Recommended Reading 66
Exam Preparation Tasks 68
Review All Key Topics 68
Complete Tables and Lists from Memory 68
Define Key Terms 68
Q&A 68
Part II LAN and WAN Design
Chapter 3 Enterprise LAN Design 81
Do I Know This Already? Quiz 81
Foundation Topics 83
LAN Media 83
Ethernet Design Rules 83
Gigabit Ethernet Design Rules 85
10 Gigabit Ethernet Design Rules 87
EtherChannel 88
Comparison of Campus Media 88
LAN Hardware 89
Repeaters 89
Hubs 89
Bridges 89
Switches 90
Routers 91
Layer 3 Switches 92
Campus LAN Design and Best Practices 93
Best Practices for Hierarchical Layers 94
STP Design Considerations 101
Cisco STP Toolkit 103
VLAN and Trunk Considerations 105
Unidirectional Link Detection (UDLD) Protocol 105
Large-Building LANs 106
Enterprise Campus LANs 107
Medium-Size LANs 109
Small and Remote Site LANs 110
Server Farm Module 110
Enterprise Data Center Infrastructure 111
Campus LAN QoS Considerations 111
Multicast Traffic Considerations 113
References and Recommended Readings 114
Exam Preparation Tasks 115
Review All Key Topics 115
Complete Tables and Lists from Memory 115
Define Key Terms 115
Q&A 115
Chapter 4 Data Center Design 127
Do I Know This Already? Quiz 127
Foundation Topics 130
Enterprise DC Architecture 130
Data Center Foundation Components 131
Data Center Topology Components 132
Data Center Network Programmability 133
Challenges in the DC 136
Data Center Facility Aspects 136
Data Center Space 138
Data Center Power 139
Data Center Cooling 140
Data Center Heat 141
Data Center Cabling 141
Enterprise DC Infrastructure 143
Data Center Storage 144
Data Center Reference Architecture 146
Defining the DC Access Layer 147
Defining the DC Aggregation Layer 148
Defining the DC Core Layer 149
Security in the DC 150
Fabric Extenders 151
Virtualization Overview 151
Challenges 151
Defining Virtualization and Benefits 151
Virtualization Risks 152
Types of Virtualization 152
Virtualization Technologies 153
VSS 153
VRF 154
vPC 154
Device Contexts 155
Server Virtualization 155
Server Scaling 155
Virtual Switching 156
Network Virtualization Design Considerations 156
Data Center Interconnect 157
DCI Use Cases 157
DCI Transport Options 158
DCI L2 Considerations 159
Load Balancing in the DC 159
Application Load Balancing 159
Network Load Balancing 160
References and Recommended Readings 160
Exam Preparation Tasks 161
Review All Key Topics 161
Complete Tables and Lists from Memory 162
Define Key Terms 162
Q&A 162
Chapter 5 Wireless LAN Design 167
Do I Know This Already? Quiz 167
Foundation Topics 169
Wireless LAN Technologies 169
WLAN Standards 169
Service Set Identifier 171
WLAN Layer 2 Access Method 172
WLAN Security 172
Cisco Unified Wireless Network 175
Cisco UWN Architecture 175
Autonomous Access Points 176
Centralized WLAN Architecture 177
LWAPP 177
WLAN Authentication 182
WLAN Controller Components 183
Roaming and Mobility Groups 186
WLAN Design 190
Controller Redundancy Design: Deterministic vs. Dynamic 190
Radio Management and Radio Groups 192
RF Site Survey 194
Using EoIP Tunnels for Guest Services 194
Wireless Mesh for Outdoor Wireless 195
Campus Design Considerations 196
Branch Design Considerations 199
References and Recommended Readings 201
Exam Preparation Tasks 203
Review All Key Topics 203
Complete Tables and Lists from Memory 203
Define Key Terms 203
Q&A 204
Chapter 6 WAN Technologies and the Enterprise Edge 215
Do I Know This Already? Quiz 215
Foundation Topics 218
WAN and Enterprise Edge Overview 218
WAN Defined 218
WAN Edge Module 219
Enterprise Edge Modules 219
WAN Transport Technologies 220
ISDN 221
Digital Subscriber Line 222
Cable 222
Wireless 223
Frame Relay 224
Time-Division Multiplexing 225
Metro Ethernet 225
SONET/SDH 225
Multiprotocol Label Switching (MPLS) 226
Dark Fiber 227
Dense Wavelength-Division Multiplexing 228
Ordering WAN Technology and Contracts 228
WAN and Edge Design Methodologies 229
Response Time 230
Throughput 231
Reliability 231
Bandwidth Considerations 231
WAN Link Categories 232
Optimizing Bandwidth Using QoS 233
DMZ Connectivity 236
Segmenting DMZs 237
DMZ Services 238
Internet Connectivity 238
Centralized Internet (Branch) vs. Direct Internet (Branch) 240
High Availability for the Internet Edge 240
VPN Network Design 240
References and Recommended Readings 242
Exam Preparation Tasks 243
Review All Key Topics 243
Complete Tables and Lists from Memory 243
Define Key Terms 243
Q&A 244
Chapter 7 WAN Design 249
Do I Know This Already? Quiz 249
Foundation Topics 252
Traditional WAN Technologies 252
Hub-and-Spoke Topology 252
Full-Mesh Topology 253
Partial-Mesh Topology 253
Point-to-Point Topology 254
Remote Site Connectivity 254
Enterprise VPN vs. Service Provider VPN 255
Enterprise Managed VPN: IPsec 255
Service Provider-Managed Offerings 259
VPN Benefits 263
WAN Backup Design 263
WAN Backup over the Internet 263
Enterprise WAN Architecture 264
Cisco Enterprise MAN/WAN 265
Enterprise WAN/MAN Architecture Comparison 266
Enterprise WAN Components 268
Comparing Hardware and Software 269
Enterprise Branch Architecture 270
Branch Design 270
Branch Connectivity 271
Redundancy for Branches 271
Single WAN Carrier vs. Dual WAN Carriers 271
Single MPLS Carrier Site 272
Dual MPLS Carriers 272
Hybrid WAN: L3 VPN with IPsec VPN 273
Enterprise Teleworker Design 279
ISRs for Teleworkers 280
References and Recommended Readings 280
Exam Preparation Tasks 281
Review All Key Topics 281
Complete Tables and Lists from Memory 281
Define Key Terms 281
Q&A 282
Part III The Internet Protocol and Routing Protocols
Chapter 8 Internet Protocol Version 4 Design 287
Do I Know This Already? Quiz 287
Foundation Topics 289
IPv4 Header 289
ToS 291
IPv4 Fragmentation 295
IPv4 Addressing 296
IPv4 Address Classes 297
IPv4 Address Types 299
IPv4 Private Addresses 299
