Troubleshooting and Maintaining Cisco IP Networks (TSHOOT) Foundation Learning Guide

Packet Forwarding 73 Selective Information Gathering Using IOS show Commands, debug Commands, Ping, and Telnet 76 Filtering and Redirecting show Command's Output 76 Testing Network Connectivity Using Ping and Telnet 81 Collecting Real-Time Information Using Cisco IOS debug Commands 85 Diagnosing Hardware Issues Using Cisco IOS Commands 86 Checking CPU Utilization 87 Checking Memory Utilization 88 Checking Interfaces 89 Summary 92 Review Questions 94 Chapter 5 Using Specialized Maintenance and Troubleshooting Tools 99 Categories of Troubleshooting Tools 100 Traffic-Capturing Features and Tools 101 SPAN 102 RSPAN 103 Information Gathering with SNMP 105 Information Gathering with NetFlow 107 Network Event Notification 109 Summary 113 Review Questions 114 Chapter 6 Troubleshooting Case Study: SECHNIK Networking 117 SECHNIK Networking Trouble Ticket 1 118 Troubleshooting PC1's Connectivity Problem 118 Gathering Information 119 Analyzing Information, Eliminating Causes, and Gathering Further Information 119 Proposing Hypotheses 121 Testing the Hypotheses and Solving the Problem 121 Troubleshooting Ethernet Trunks 122 Troubleshooting PC2's Connectivity Problem 123 Gathering Information 124 Proposing a Hypothesis, Testing the Hypothesis, and Solving the Problem 126 Troubleshooting NAT 127 Troubleshooting PC3's Connectivity Problem 128 Gathering Information 129 Eliminating Possibilities, Proposing a Hypothesis, and Testing the Hypothesis 129 Troubleshooting Network Device Interfaces 130 Troubleshooting PC4's IPv6 Connectivity Problem 131 Gathering Information 131 Eliminating Possibilities, Proposing a Hypothesis, and Testing the Hypothesis 132 Troubleshooting IPv6 Address Assignment on Clients 133 SECHNIK Networking Trouble Ticket 2 134 Troubleshooting PC1's Internet Connectivity Problem 134 Gathering Information 135 Proposing a Hypothesis, Testing the Hypothesis, and Solving the Problem 137 Troubleshooting Network Layer Connectivity 138 Troubleshooting PC2's SSH Connectivity Problem 141 Verifying and Defining the Problem 141 Gathering Information 142 Proposing a Hypothesis and Testing the Hypothesis 143 TCP Three-Way Handshake 145 Troubleshooting PC4's DHCP Address Problem 146 Verifying and Defining the Problem 146 Gathering Information 147 Proposing a Hypothesis, Testing a Hypothesis, and Solving the Problem 148 Troubleshooting Error-Disabled Ports 151 SECHNIK Networking Trouble Ticket 3 152 Troubleshooting PC1 and PC2's Internet Connectivity Issues 153 Verifying and Defining the Problem 153 Gathering Information 153 Proposing a Hypothesis and Testing the Hypothesis 157 Solving the Problem 159 Troubleshooting DHCP 160 The passive-interface Command 161 Troubleshooting PC3's Internet Connectivity Issues 162 Verifying and Defining the Problem 162 Gathering Information 162 Proposing a Hypothesis and Testing the Hypothesis 164 Solving the Problem 165 IPv6 Review 166 Summary 166 Review Questions 169 Chapter 7 Troubleshooting Case Study: TINC Garbage Disposal 173 TINC Garbage Disposal Trouble Ticket 1 174 Troubleshooting Lack of Backup Internet Connectivity Through GW2 174 Information Gathering 176 Analyzing Information, Eliminating Possibilities, and Proposing a Hypothesis 178 Proposing a Hypothesis, Testing the Hypothesis, and Solving the Problem 178 Troubleshooting BGP Neighbor Relationships 181 Troubleshooting PC1's Connectivity Problem 182 Gathering Information 182 Analyzing Information and Gathering Further Information 183 Proposing a Hypothesis, Testing the Hypothesis, and Solving the Problem 184 Troubleshooting Port Security 186 Troubleshooting PC2's Connectivity Problem 187 Gathering Information 188 Eliminating Possibilities, Proposing a Hypothesis, and Testing the Hypothesis 190 Solving the Problem 191 Troubleshooting VLANs 192 TINC Garbage Disposal Trouble Ticket 2 193 Troubleshooting GW1's OSPF Neighbor Relation Problem with Router R1 194 Verifying the Problem 194 Gathering Information 194 Analyzing Information, Eliminating Possibilities, and Proposing a Hypothesis 199 Testing the Hypothesis and Solving the Problem 199 Troubleshooting OSPF Adjacency 201 Troubleshooting Secure Shell Version 2 Access to Router R2 from PC4 202 Verifying the Problem 202 Gathering Information 203 Proposing a Hypothesis and Testing the Hypothesis 204 Solving the Problem 205 Troubleshooting SSH and Telnet 206 Troubleshooting Duplicate Address Problem Discovered Through R1 and R2's Log Messages 207 Verifying the Problem 207 Gathering Information 207 Analyzing the Information and Proposing a Hypothesis 210 Testing the Hypothesis and Solving the Problem 210 Troubleshooting HSRP 211 TINC Garbage Disposal Trouble Ticket 3 212 Troubleshooting Sporadic Internet Connectivity Problem Experienced by Users of PC1 and PC2 212 Verifying and Defining the Problem 213 Gathering Information 213 Analyzing Information and Proposing a Hypothesis 215 Testing the Hypothesis and Solving the Problem 217 Troubleshooting Erroneous Routing Information 218 Troubleshooting Multiple Masters within a VRRP 220 Verifying and Defining the Problem 220 Gathering Information 221 Analyzing the Information and Proposing a Hypothesis 222 Testing the Hypothesis, and Solving the Problem 222 Troubleshooting VRRP 224 Troubleshooting EtherChannel Between ASW4 and ASW3 224 Verifying the Problem 224 Defining the Problem 225 Gathering Information 225 Proposing a Hypothesis and Testing the Hypothesis 227 Solving the Problem 228 Troubleshooting EtherChannel 229 TINC Garbage Disposal Trouble Ticket 4 231 Troubleshooting Inconsistent and Sporadic Internet Connectivity Problem Experienced By Users of PC1 and PC2 231 Verifying and Defining the Problem 232 Gathering Information 233 Analyzing Information and Proposing a Hypothesis 235 Testing the Hypotheses 235 Solving the Problem 239 Troubleshooting FHRPs 241 Troubleshooting Sporadic Loss of Connectivity on PC4 242 Verifying the Problem and Making a Troubleshooting Plan 242 Gathering Information 242 Analyzing the Information and Gathering Further Information 244 Proposing a Hypothesis and Testing the Hypothesis 245 Solving the Problem 246 The Cisco IOS DHCP Snooping Feature 248 Cisco Technical Assistance Center 248 Troubleshooting SSH Connection from PC4 to Router GW2 249 Verifying the Problem and Making a Troubleshooting Plan 249 Gathering Information 250 Proposing a Hypothesis and Testing the Hypothesis 251 Solving the Problem 252 Summary 252 Review Questions 255 Chapter 8 Troubleshooting Case Study: PILE Forensic Accounting 257 PILE Forensic Accounting Trouble Ticket 1 258 Troubleshooting PILE's Branch Connectivity to HQ and the Internet 258 Verifying and Defining the Problem 258 Gathering Information 260 Analyzing Information 264 Proposing a Hypothesis and Testing the Hypothesis 264 Solving the Problem 265 Troubleshooting EIGRP Adjacency 266 Troubleshooting PILE's Secondary Internet Connection Through ISP2 267 Verifying and Defining the Problem 267 Gathering Information 268 Analyzing Information and Proposing a Hypothesis 270 Testing the Hypothesis 271 Solving the Problem 273 PILE Forensic Accounting Trouble Ticket 2 274 Troubleshooting Telnet Problem: From PC3 to BR 274 Gathering Information 275 Troubleshooting PILE Network's Internet Access Problem 275 Verifying and Defining the Problem 276 Gathering Information 276 Analyzing Information, Eliminating Causes, and Gathering Further Information 278 Proposing and Testing a Hypothesis 280 Solving the Problem 281 Troubleshooting BGP 281 Troubleshooting PILE Network's NTP Problem 282 Verifying the Problem 283 Gathering Information 283 Analyzing the Gathered Information and Gathering Further Information 284 Proposing a Hypothesis and Testing the Hypothesis 285 Solving the Problem 286 Troubleshooting NTP 286 PILE Forensic Accounting Trouble Ticket 3 287 Troubleshooting PC3's Lack of Internet Connectivity After the Disaster Recovery 287 Verifying the Problem 288 Gathering Information (First Run) 288 Analyzing Information, Proposing, and Testing the First Hypothesis 289 Proposing and Testing the Second Hypothesis 290 Gathering Further Information (Second Run) 292 Proposing and Testing the Third Hypothesis 293 Solving the Problem 294 Disaster Recovery Best Practices 294 Troubleshooting Inter-VLAN Routing 296 Troubleshooting PC4's Problem Accessing Cisco.com 297 Verify the Problem and Select an Approach 297 Gather Information and Analyze the Information 298 Proposing and Testing a Hypothesis 299 Solve the Problem 299 Troubleshooting DNS 300 Remote Device Management Notes 301 PILE Forensic Accounting Trouble Ticket 4 302 Troubleshooting Branch Site Internet Connectivity Problem After EIGRP Reconfiguration 302 Verifying the Problem 302 Gathering Information 303 Gathering Further Information and Analyzing Information 303 Proposing a Hypothesis and Testing the Hypothesis 305 Solving the Problem 307 The EIGRP Stub Configuration 308 The New EIGRP Named Configuration 309 Troubleshooting Management Access to ASW2 310 Verifying the Problem 310 Gathering Information 310 Proposing a Hypothesis and Testing the Hypothesis 311 Solving the Problem 312 Providing a Default Route on Layer 2 And Multilayer Devices 313 PILE Forensic Accounting Trouble Ticket 5 313 Troubleshooting the Redundant Internet Access Path Through the New HQ0 Edge Router 314 Verifying and Defining the Problem 314 Gathering Information 315 Proposing a Hypothesis and Testing the Hypothesis 318 Solving the Problem 319 Troubleshooting BGP Route Selection 321 Troubleshooting Unauthorized Telnet Access 322 Verifying the Problem 322 Gathering Information 322 Gathering Further Information and Analysis Information 323 Proposing a Hypothesis and Testing the Hypothesis 324 Solving the Problem 325 Securing the Management Plane 325 Summary 326 Review Questions 329 Chapter 9 Troubleshooting Case Study: Bank of POLONA 333 Bank of POLONA Trouble Ticket 1 334 Troubleshooting PC3's Lack of Connectivity to SRV2 335 Verifying the Problem 335 Gathering Information 336 Analyzing Information and Proposing a Hypothesis, and Testing the Hypothesis 338 Solving the Problem 339 Troubleshooting Redistribution 339 Troubleshooting VRRP with Interface Tracking 340 Verifying the Problem 340 Gathering Information 341 Analyzing the Information 342 Proposing and Testing a Hypothesis 342 Solving the Problem 343 FHRP Tracking Options 344 Troubleshooting IP SLA Test Not Starting 345 Verifying the Problem 345 Gathering Information 346 Proposing and Testing a Hypothesis 347 Solving the Problem 348 Troubleshooting IP SLA 349 Bank of POLONA Trouble Ticket 2 349 Troubleshooting Summarization Problem on BR3 350 Verifying the Problem 350 Gathering Information 350 Analyzing Information 351 Proposing and Testing a Hypothesis 351 Solving the Problem 352 Troubleshooting EIGRP Summarization 353 Troubleshooting PC0's IPv6 Internet Connectivity 353 Verifying the Problem 353 Gathering Information 354 Analyzing Information 356 Proposing and Testing a Hypothesis 356 Solving the Problem 357 Troubleshooting RIPng 357 Troubleshooting Branch 3's IPv6 Internet Connectivity 358 Verifying the Problem 358 Gathering Information 359 Analyzing Information 361 Proposing and Testing a Hypothesis 361 Solving the Problem 362 Troubleshooting Access Control Lists 362 Bank of POLONA Trouble Ticket 3 364 Troubleshooting Branch 1's IP Connectivity to the Headquarters 364 Verifying the Problem 364 Gathering Information 365 Proposing and Testing a Hypothesis 366 Gathering Further Information 367 Proposing and Testing Another Hypothesis 367 Solving the Problem 368 Troubleshooting GRE Tunnels 368 Troubleshooting Branch 3's Route Summarization 369 Verifying the Problem and Choosing an Approach 369 Gathering Information 370 Analyzing the Information and Proposing a Hypothesis 373 Testing the Hypothesis and Solving the Problem 373 OSPF Summarization Tips and Commands 374 Troubleshooting AAA Authentication on the Branch 1 Router 375 Verifying the Problem and Choosing an Approach 375 Gathering Information 375 Proposing a Hypothesis 376 Testing the Hypothesis and Solving the Problem 376 Troubleshooting AAA 377 Bank of POLONA Trouble Ticket 4 378 Troubleshooting PC0's Connectivity to IPv6 Internet 378 Verifying the Problem and Choosing an Approach 378 Gathering Information 379 Analyzing the Information and Proposing and Testing a Hypothesis 381 Gathering Further Information 382 Analyzing Information and Proposing and Testing Another Hypothesis 383 Solving the Problem 384 Troubleshooting OSPF for IPv6 385 Troubleshooting the Dysfunctional Totally Stubby Branch Areas 386 Verifying the Problem and Choosing an Approach 386 Gathering Information 387 Analyzing Information 389 Proposing and Testing a Hypothesis 389 Solving the Problem 390 OSPF Stub Areas 391 Summary 391 Review Questions 394 Chapter 10 Troubleshooting Case Study: RADULKO Transport 397 RADULKO Transport Trouble Ticket 1 398 Mitigating Unauthorized Switches Added by Employees 398 Gathering Information 399 Analyzing Information 400 Proposing a Hypothesis and Solving the Problem 400 Troubleshooting Spanning Tree Protocol 401 Troubleshooting Policy-Based Routing 403 Verifying and Defining the Problem 404 Gathering Information 404 Analyzing the Information 405 Proposing and Testing a Hypothesis 405 Solving the Problem 406 Troubleshooting PBR 407 Troubleshooting Neighbor Discovery 407 Verifying and Defining the Problem 408 Gathering Information 408 Proposing and Testing a Hypothesis 409 Solving the Problem 409 Troubleshooting CDP and LLDP 410 RADULKO Transport Trouble Ticket 2 411 Troubleshooting VLANs and PCs Connectivity Problems 411 Verifying the Problem 412 Gathering Information 412 Analyzing the Information 413 Proposing and Testing a Hypothesis 413 Solving the Problem 414 Troubleshooting VTP 415 Troubleshooting Branch Router's IPv6 Problems 416 Verifying the Problem 416 Gathering Information 417 Proposing and Testing a Hypothesis 418 Solving the Problem 418 Troubleshooting EIGRP for IPv6 419 Troubleshooting MP-BGP Session Problem 420 Verifying the Problem 420 Gathering Information 420 Analyzing the Information and Proposing a Hypothesis 421 Solving the Problem 422 Troubleshooting MP-BGP 423 RADULKO Transport Trouble Ticket 3 424 Troubleshooting PC1's Problem Accessing the SRV Server at the Distribution Center 424 Verifying and Defining the Problem 424 Gathering Information 425 Analyzing Information 428 Proposing and Testing a Hypothesis 428 Solving the Problem 429 Troubleshooting the OSPFv3 Address Families Feature 429 Troubleshooting OSPFv3 Authentication 430 Verifying the Problem 430 Gathering Information 431 Analyzing Information 432 Proposing and Testing a Hypothesis 432 Solving the Problem 433 RADULKO Transport Trouble Ticket 4 433 Troubleshooting Undesired External OSPF Routes in DST's Routing Table 434 Verifying and Defining the Problem 434 Gathering Information 435 Analyzing Information 436 Proposing and Testing a Hypothesis 437 Solving the Problem 439 Troubleshooting PCs IPv6 Internet Access 440 Verifying the Problem 440 Gathering Information 440 Analyzing Information 442 Proposing and Testing a Hypothesis 443 Solving the Problem 444 Summary 444 Review Questions 448 Appendix A Answers to Review Questions 451 9781587204555 TOC 11/26/2014