Part Iiilan Switching 227

Chapter 9 Cisco LAN Switching Basics 229

"Do I Know This Already?" Quiz 229 Foundation Topics 234 The Case for Bridging and Switching 234 Transparent Bridging 236

The Forward Versus Filter Decision 237 How Bridges Learn MAC Addresses 239 Forwarding Unknown Unicasts and Broadcasts 240 LAN Switching 240

Full-Duplex Ethernet 242 Internal Processing on Cisco Switches 242 Speed and Autonegotiation 244 Summary: Bridges and Switches 244 LAN Segmentation 245 The Need for Spanning Tree 248

How Spanning Tree Works 249 Foundation Summary 252 Q&A 255

Chapter 10 Virtual LANs and Trunking 259

"Do I Know This Already?" Quiz 259 Foundation Topics 263 Virtual LAN Concepts 263 VLAN Bastes 263 Creating VLANs 264 Trunking with ISL and 802.1q 265 Cisco ISL 266 IEEE 802.1q 266 ISL and 802.1q Compared 267 Passing Traffic Between VLANs 268 Layer 2 Switching 268 Layer 3 Forwarding Using a Router 268 Layer 3 Forwarding Using a Layer 3 Switch 270 Layer 4 Switching 271 Layer 5-7 Switching 272 Multilayer Switching 272 Foundation Summary 274 Q&A 276

Chapter 11 LAN Cabling, Standards, and Topologies 279

"Do I Know This Already?" Quiz 279 Foundation Topics 283 Network Topologies 283 Cabling and Connectors 287

General Features of Metallic Cabling 287

Unshielded Twisted-Fair and Shielded Twisted-Fair Cabling and Connectors 289 UTP Standards 290 UTP Connectors 290 Coaxial Cabling 291

Fiber-Optic Cabling and Connectors for Ethernet 293

Optical Connectors for Ethernet 295 Summary: Ethernet Cabling 297 Ethernet Standards 297 Ethernet Framing 298 Ethernet Cabling Standards 298 10-Gigabit Ethernet 299 Wireless Communications 300

IEEE 802.11 Wireless LANs 301 Foundation Summary 303 Q&A 308

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