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Chapter 17 IP Routing in the LAN 392
“Do I Know This Already?” Quiz 393
Foundation Topics 395
VLAN Routing with Router 802.1Q Trunks 395
Configuring ROAS 396
Verifying ROAS 398
Troubleshooting ROAS 400
VLAN Routing with Layer 3 Switch SVIs 401
Configuring Routing Using Switch SVIs 401
Verifying Routing with SVIs 403
Troubleshooting Routing with SVIs 404
VLAN Routing with Layer 3 Switch Routed Ports 406
Implementing Routed Interfaces on Switches 407
Implementing Layer 3 EtherChannels 410
Troubleshooting Layer 3 EtherChannels 413
Chapter Review 414
Chapter 18 Troubleshooting IPv4 Routing 418
“Do I Know This Already?” Quiz 418
Foundation Topics 419
Problem Isolation Using the ping Command 419
Ping Command Basics 419
Strategies and Results When Testing with the ping Command 420
Testing Longer Routes from Near the Source of the Problem 421
Using Extended Ping to Test the Reverse Route 423
Testing LAN Neighbors with Standard Ping 425
Testing LAN Neighbors with Extended Ping 426
Testing WAN Neighbors with Standard Ping 427
Using Ping with Names and with IP Addresses 427
Problem Isolation Using the traceroute Command 428
traceroute Basics 429
How the traceroute Command Works 429
Standard and Extended traceroute 431
Telnet and SSH 432
Common Reasons to Use the IOS Telnet and SSH Client 432
IOS Telnet and SSH Examples 433
Chapter Review 435
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xxiii
Part V Review 436
Part VI 
OSPF 439
Chapter 19 Understanding OSPF Concepts 440
“Do I Know This Already?” Quiz 440
Foundation Topics 442
Comparing Dynamic Routing Protocol Features 442
Routing Protocol Functions 443
Interior and Exterior Routing Protocols 444
Comparing IGPs 445
IGP Routing Protocol Algorithms 445
Metrics 446
Other IGP Comparisons 447
Administrative Distance 448
OSPF Concepts and Operation 449
OSPF Overview 449
Topology Information and LSAs 450
Applying Dijkstra SPF Math to Find the Best Routes 451
Becoming OSPF Neighbors 451
The Basics of OSPF Neighbors 451
Meeting Neighbors and Learning Their Router ID 452
Exchanging the LSDB Between Neighbors 454
Fully Exchanging LSAs with Neighbors 454
Maintaining Neighbors and the LSDB 455
Using Designated Routers on Ethernet Links 456
Calculating the Best Routes with SPF 457
OSPF Areas and LSAs 459
OSPF Areas 460
How Areas Reduce SPF Calculation Time 461
(OSPFv2) Link-State Advertisements 462
Router LSAs Build Most of the Intra-Area Topology 463
Network LSAs Complete the Intra-Area Topology 464
Chapter Review 465
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xxiv CCNA 200-301 Official Cert Guide, Volume 1