Outline

Modules: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | All |

Module 1 - 7 Outline

Module 1: Documenting and Baselining the Network |
Module Overview |

1.1

Network Baselining

1.1.1 | Network baselining overview
1.1.2 | Planning for the first baseline
1.1.3 | Identifying devices and ports of interest
1.1.4 | Determining the duration of the baseline
1.1.5 | Using the baseline data
1.1.6 | Identifying undesired network behavior
1.1.7 | Identifying thresholds
1.1.8 | Predicting long-term performance and capacity trends
1.1.9 | Verifying policies

1.2

Network Configuration Documentation

1.2.1 | Network configuration documentation overview
1.2.2 | Identifying the components of a network configuration table
1.2.3 | Identifying the components of a topology diagram
1.2.4 | Discovering network configuration information
1.2.5 | Describing the process of creating network documentation
1.2.6 | Creating network documentation

1.3

Building-Block Approach

1.3.1 | Identifying the components of an end-system configuration table
1.3.2 | Identifying the components of an end-system topology table
1.3.3 | Identifying commands and applications used to discover information about end-system configuration
1.3.4 | Discovering end-system configuration information
1.3.5 | Creating end-system network configuration documentation

Module Summary |
Module Quiz |

Module 2: Troubleshooting Methodologies and Tools |
Module Overview |

2.1

Using a Layered Architectural Model to Describe Data Flow

2.1.1 | Encapsulating data
2.1.2 | Bits on the physical medium
2.1.3 | Network devices utilize control information
2.1.4 | Decapsulation
2.1.5 | OSI model versus TCP/IP model
2.1.6 | Position of network devices in layered model

2.2

Troubleshooting Approaches

2.2.1 | General troubleshooting process
2.2.2 | Bottom-up
2.2.3 | Top-down
2.2.4 | Divide and conquer
2.2.5 | Guidelines for selecting an approach

2.3

Gathering Symptoms

2.3.1 | Gathering symptoms for a network problem
2.3.2 | Gathering symptoms from an end-user: hardware
2.3.3 | Gathering symptoms from an end-user: software
2.3.4 | Questions to ask an end-user
2.3.5 | Flow charts for gathering network and end-user symptoms

2.4

Network Management Tools

2.4.1 | Network management system frameworks
2.4.2 | Knowledge base tools
2.4.3 | Performance measurement and reporting tools
2.4.4 | Event and fault management tools
2.4.5 | Policy management tools

Module Summary |
Module Quiz |

Module 3: Troubleshooting at the Physical Layer |
Module Overview |

3.1

Characteristics of Physical Layer Failure Problems

3.1.1 | Critical characteristics – connectivity
3.1.2 | Critical characteristics – upper layer component operation
3.1.3 | Noncritical characteristics – equipment indicators
3.1.4 | Noncritical characteristics – power failures
3.1.5 | Noncritical characteristics – console messages

3.2

Characteristics of Physical Layer Optimization Problems

3.2.1 | Performance lower than baseline
3.2.2 | Exceeding cable design limits, poor quality cabling and connections
3.2.3 | Noise
3.2.4 | Collisions
3.2.5 | Other data transmission issues
3.2.6 | Resources
3.2.7 | Utilization
3.2.8 | Console messages

3.3

Windows and Cisco Commands for Physical Layer Information Gathering

3.3.1 | End-system commands – common commands
3.3.2 | End-system commands – Windows only
3.3.3 | End-system commands – UNIX/Mac OS
3.3.4 | Common Cisco IOS commands
3.3.5 | Cisco IOS show commands

3.4

Identifying Physical Layer Problems

3.4.1 | Power related
3.4.2 | Cabling faults – CAT5
3.4.3 | Cabling faults – fiber and coax
3.4.4 | Hardware
3.4.5 | Collision based problems – shared media
3.4.6 | External interference
3.4.7 | Configuration script errors
3.4.8 | CPU overload

3.5

Isolating Physical Layer Problems

3.5.1 | Methodology
3.5.2 | Tools for the job
3.5.3 | Bad cabling
3.5.4 | Cabling incorrect
3.5.5 | Interface configuration
3.5.6 | Operational statistics

3.6

Implementing Physical Layer Solutions

3.6.1 | Solving common problems – methodology
3.6.2 | ARP commands
3.6.3 | Solving common problems – Windows, UNIX/Mac OS end-system commands
3.6.4 | Solving common problems – Cisco IOS commands
3.6.5 | Redundancy
3.6.6 | Solving common problems – support resources

Module Summary |
Module Quiz |

Module 4: Layer 2 Troubleshooting |
Module Overview |

4.1

Characteristics of Data Link Layer Problems

4.1.1 | Data link layer problems overview
4.1.2 | No component above the data link layer is functional
4.1.3 | The network is functional, but operating at less than the baseline level
4.1.4 | Framing errors
4.1.5 | Encapsulation errors
4.1.6 | Layer 2 to Layer 3 address mapping errors
4.1.7 | Critical characteristics – no network layer connectivity
4.1.8 | Upper layer component operation
4.1.9 | Critical characteristics – console messages

4.2

End-System Commands for Gathering Data Link Information

4.2.1 | Common end-system commands
4.2.2 | Microsoft Windows end-system commands
4.2.3 | UNIX/Mac operating systems end-system commands
4.2.4 | General Cisco IOS commands
4.2.5 | Cisco IOS show commands
4.2.6 | The show cdp neighbors command

4.3

Troubleshooting Switched Ethernet Networks

4.3.1 | Troubleshooting the Spanning Tree Protocol
4.3.2 | Troubleshooting STP loops
4.3.3 | Preventing STP loops
4.3.4 | Troubleshooting incorrect STP root configuration
4.3.5 | Troubleshooting Ethernet broadcast traffic
4.3.6 | Troubleshooting Ethernet switch flooding
4.3.7 | Troubleshooting VTP misconfiguration
4.3.8 | Troubleshooting EtherChannel

4.4

Troubleshooting ISDN

4.4.1 | T1 framing errors
4.4.2 | Troubleshooting ISDN primary rate switch types
4.4.3 | Troubleshooting ISDN BRI to telco communications
4.4.4 | Troubleshooting ISDN BRI dialer problems
4.4.5 | Debugging ISDN call setup failures

4.5

Troubleshooting Frame Relay

4.5.1 | Steps for troubleshooting Frame Relay
4.5.2 | The show frame-relay lmi command
4.5.3 | The show frame-relay pvc command
4.5.4 | Frame Relay encapsulation type
4.5.5 | Troubleshooting Frame Relay using the line status
4.5.6 | Ping the local IP address on a multipoint Frame Relay
4.5.7 | Reconfiguring a subinterface

4.6

PPP and Layer 2 Considerations for Routed and Routing Protocols

4.6.1 | Link Control Protocol
4.6.2 | Troubleshooting PPP authentication PAP
4.6.3 | Troubleshooting PPP authentication CHAP
4.6.4 | IP split horizon checking
4.6.5 | OSPF in an NBMA environment
4.6.6 | The keyword broadcast
4.6.7 | Excessive fragmentation

Module Summary |
Module Quiz |

Module 5: Layer 3 Troubleshooting |
Module Overview |

5.1

Troubleshooting Network Layer Problems

5.1.1 | What are network layer problems?
5.1.2 | Isolating the problem methodology
5.1.3 | Static routes, dynamic routing, summarization, redistribution, and combinations

5.2

Troubleshooting Static Routes

5.2.1 | Static routes and classful lookups
5.2.2 | Static routes and intermediate addresses
5.2.3 | Static routes optimization with serial networks
5.2.4 | Static routes optimization with Ethernet networks
5.2.5 | Recurring static route installation and deletion
5.2.6 | Using discard routes

5.3

Common IGP Routing Protocol Issues, Causes, and Solutions

5.3.1 | Introduction
5.3.2 | Missing or incorrect network or neighbor statement
5.3.3 | Layer 1 or 2 down
5.3.4 | Distribute-list in/out blocking
5.3.5 | Access list blocking
5.3.6 | Advertised network interface is down
5.3.7 | Passive interface

5.4

Troubleshooting RIP

5.4.1 | Incompatible RIP version types
5.4.2 | Mismatched authentication key
5.4.3 | Reaches RIP hop count limit
5.4.4 | Discontiguous networks
5.4.5 | Invalid source address
5.4.6 | Flapping routes
5.4.7 | Large routing tables

5.5

Troubleshooting IGRP

5.5.1 | Discontiguous networks
5.5.2 | AS mismatch
5.5.3 | Misconfigured neighbor statement
5.5.4 | Maximum paths
5.5.5 | Candidate default

5.6

Troubleshooting EIGRP

5.6.1 | Mismatched K values
5.6.2 | Mismatched AS number
5.6.3 | Stuck in active – determining the problem
5.6.4 | Stuck in active – methodology for troubleshooting
5.6.5 | Stuck in active – the ultimate solution
5.6.6 | Duplicate router IDs
5.6.7 | EIGRP error messages

5.7

Troubleshooting OSPF

5.7.1 | Mismatched parameters
5.7.2 | OSPF state issues
5.7.3 | One side of point-to-point link is unnumbered
5.7.4 | ABR not generating Type 4 summary LSA
5.7.5 | Forwarding address is not known through the intra-area or interarea route
5.7.6 | Route summarization problems
5.7.7 | CPUHOG problems
5.7.8 | SPF calculation and route flapping

5.8

Troubleshooting IS-IS

5.8.1 | IS-IS adjacency problems
5.8.2 | Some or all of the adjacencies are not coming up
5.8.3 | Adjacency is stuck in INIT state
5.8.4 | ES-IS adjacency instead of IS-IS adjacency formed
5.8.5 | Route advertisement problems
5.8.6 | Route flapping problem

5.9

Troubleshooting BGP

5.9.1 | Troubleshooting BGP neighbor relationships
5.9.2 | Troubleshooting BGP route advertisements
5.9.3 | Troubleshooting routes not being installed in the IP routing table
5.9.4 | The BGP next hop is not reachable
5.9.5 | BGP routes getting dampened
5.9.6 | Troubleshooting outbound and inbound BGP policy issues
5.9.7 | Traffic takes a different interface than what is shown in routing table

5.10

Troubleshooting Redistribution

5.10.1 | Redistribution problems with RIP
5.10.2 | Redistribution problems with IGRP/EIGRP
5.10.3 | Redistribution problems with OSPF
5.10.4 | Redistribution problems with IS-IS
5.10.5 | Redistribution problems with BGP

Module Summary |
Module Quiz |

Module 6: Layer 4 Troubleshooting |
Module Overview |

6.1

Characteristics of Transport Layer Technologies

6.1.1 | Common transport layer technologies
6.1.2 | User Datagram Protocol
6.1.3 | Transport Control Protocol
6.1.4 | Standard access control lists
6.1.5 | Extended access control lists
6.1.6 | Static IP Network Address Translation
6.1.7 | Dynamic IP Network Address Translation
6.1.8 | NetBIOS and NetBEUI

6.2

Troubleshooting Transport Layer Issues on the Router

6.2.1 | Common issues with extended ACLs
6.2.2 | Gathering information on ACL operation
6.2.3 | Optimizing access list operation
6.2.4 | Common issues with IP NAT
6.2.5 | Gathering information on NAT configuration and operation
6.2.6 | Other useful information

6.3

Troubleshooting Transport Layer Issues on Network Hosts

6.3.1 | Common transport layer issues with IP networks
6.3.2 | Gathering transport layer information on Windows machines
6.3.3 | Gathering transport layer information on UNIX machines
6.3.4 | Common issues with NetBIOS networks
6.3.5 | Gathering NetBIOS information

6.4

Troubleshooting Complex Network Systems

6.4.1 | Identifying complex transport layer problems
6.4.2 | Disassembling the problem
6.4.3 | Solving the component problems
6.4.4 | Dynamic NAT and extended ACLs
6.4.5 | TCP load distribution with NAT

Module Summary |
Module Quiz |

Module 7: Layer 1-7 Troubleshooting |
Module Overview |

7.1

Troubleshooting the Application Layer

7.1.1 | Overview
7.1.2 | Eliminating Layers 1-3
7.1.3 | Eliminating Layer 4
7.1.4 | Isolating application layer problems
7.1.5 | Identifying support resources
7.1.6 | Accessing support resources
7.1.7 | Correcting application layer problems

7.2

Gathering Information on Application Layer Problems

7.2.1 | Overview
7.2.2 | Common TCP/IP commands
7.2.3 | Platform specific TCP/IP utilities
7.2.4 | Cisco IOS commands
7.2.5 | System logs
7.2.6 | Syslog destinations
7.2.7 | Deciphering syslog messages
7.2.8 | Protocol analyzers
7.2.9 | Network management systems

7.3

Troubleshooting TCP/IP Application Layer Protocols

7.3.1 | Overview
7.3.2 | Client-server systems
7.3.3 | Terminals and consoles
7.3.4 | Web traffic
7.3.5 | Electronic mail
7.3.6 | File transfer
7.3.7 | Network management and time protocols
7.3.8 | Name resolution
7.3.9 | Dynamic Host Configuration Protocols (DHCP)

7.4

Troubleshooting TCP/IP Application Layer Problems

7.4.1 | Troubleshooting Telnet problems
7.4.2 | Troubleshooting HTTP problems
7.4.3 | Troubleshooting e-mail problems
7.4.4 | Troubleshooting FTP problems
7.4.5 | Troubleshooting DNS problems

Module Summary |
Module Quiz |

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