1. Establishing a Baseline
- Creating Network Configuration Documentation
- Components of a Network Configuration Table
- Components of a Topology Diagram
- Discovering Network Configuration on a Router or Multilayer Switch
- Discovering Network Configuration on a Layer 2 Switch
2. Creating End-System Network Configuration Documentation
- Components of an End-System Configuration Table
- Components of an End-System Topology Diagram
- Commands and Applications Used to Discover End-System Network Configuration
3. Determining an Effective Troubleshooting Strategy
- Applying a Layered Model to a Network
- Comparing Layered Network Models
- The Encapsulated Data Flow Process
- The Layers of a Logical Model
- General Troubleshooting Process
- Gathering Symptoms
- Isolating Problems
- Correcting Problems
- Gathering Symptoms
- Network Symptoms
- User Symptoms
- End-System Symptoms
- Selecting a Troubleshooting Approach
- The Bottom-Up Approach
- The Top-Down Approach
- The Divide-and-Conquer Approach
4. Resolving Problems at the Physical and Data Link Layers
- Identifying Physical Layer and Data Link Layer Symptoms
- Cisco IOS Commands
- Windows Commands
- UNIX Commands
- Isolating Problems
- Serial Interface
- Frame Relay
- Ethernet
- FastEthernet
5. Resolving Problems at the Network Layer
- Common Symptoms of Network Layer Problems
- IOS Commands for Network Layer Troubleshooting
- General Commands
- ARP-Related Commands
- Routing Table Commands
- Interface-Related Commands
- BGP-Related Commands
- Traffic-Related Commands
- Access List-Related Commands
- Windows and UNIX Commands for Network Layer Troubleshooting
- Case Study
- Identifying Support Resources
6. Resolving Problems at the Transport and Application Layers
- Common Symptoms of Transport Layer Problems
- Common Symptoms of Application Layer Problems
- IOS Commands for Transport and Application Layer Troubleshooting
- General Commands
- Name Resolution Commands
- Policy-Related Commands
- File Management Commands
- DHCP-Related Commands
- SNMP- and NTP-Related Commands
- Testing Network Applications With Telnet
- Windows and UNIX Commands for Transport and Application Layer
- Case Study
Labs
This course features enhanced labs. Download the Lab Topology .
Lab 1: Network Discovery
Use Cisco IOS diagnostic commands to discover and document IP addresses, routing protocols, STP configuration, trunk links, EtherChannels, and more.
Lab 2: End-System Documentation
Use end-system command-line tools and applications to discover and document the configuration of a Windows workstation and a Linux workstation.
Lab 3: Tracing Packet Flow on a Router
Utilize Cisco IOS tools to examine low-level traffic flow on routers. Examine the ARP protocol. Examine the effects of caching on IOS debug tools. Observe ICMP traffic.
Labs 4-6: Physical and Data-Link Trouble Ticket A, B, and C
In these three labs, you'll practice low-level troubleshooting skills on Ethernet, FastEthernet, Frame Relay, and T-1 links. You will be given a pre-configured network with a variety of problems, which you must then diagnose and solve.
Labs 7-10: Network Layer Trouble Tickets A, B, C, and D
These four labs allow you to practice network-layer troubleshooting skills. You will be given a pre-configured network with a variety of problems, which you must then diagnose and solve. Scenarios will include IP addressing problems, EIGRP, OSPF, and BGP problems, interface problems, redistribution problems, etc.
Lab 11: Upper Layer Trouble Ticket A
Practice your troubleshooting skills on problems related to transport and application layer protocols, including HTTP, FTP, TFTP, etc.
Labs 12-14: Comprehensive Trouble Tickets A, B, and C
In these three labs, you'll practice your troubleshooting skills in complex scenarios that include problems at the physical, data-link, network, and application layers. Special additional problems appear as well to keep you on your toes.