Adopt saving, restoring, and archiving configurations to change how you maintain network devices and facilitate faster troubleshooting when issues arise.

Use pipe filtering to tailor show command output with include, exclude, and begin, pulling relevant data from commands like show ip route, show ip interface brief, and show running config.

Explore specialized troubleshooting tools that assist in diagnosing the underlying causes of network issues by applying utilities to routers and switches and building on basic troubleshooting theory.

Identify and use troubleshooting tools across problem definition and analysis phases. Leverage event notification, embedded event management, logging, and net flow to capture traffic, baselines, and perform configuration rollback.

Identify network congestion by using a span session to mirror traffic from gigabit interfaces, capture with Wireshark, and analyze traffic types causing buffer drops.

Use net flow to locate congested traffic by enabling IP flow top talkers, top five by bytes on Ethernet 0.1, and identify the device consuming the most bandwidth.

Begin module six by tackling Acme corporation's first troubleshooting scenario, solving the reported issues one by one using the methodologies discussed in earlier modules. Let's get started.

Analyze the Acme network’s four issues in a small setup—from router to distribution and access switches—covering server access, internet access, SSH, and IPv6 connectivity.

Diagnose IPv6 addressing issues by comparing devices, enabling IPv6 auto configuration (router discovery) on Windows, and verifying global unicast addresses through ping and show commands.

Diagnose and resolve three network issues for Overseas Incorporated by examining their US-Europe network diagram. Apply systematic troubleshooting to each issue.

Troubleshoot port security by checking static vs dynamic MAC entries, address limits, and saved vs running configurations; verify interface status and MAC table for IP phone and PC connections.

Analyze the Education Systems network diagram to identify and resolve critical issues quickly and efficiently through structured troubleshooting and problem-solving.

Troubleshoot EIGRP adjacency by checking AS number and k value mismatches, passive interfaces, authentication errors, filters, and subnet mask issues. Use show ip protocols and show ip eigrp neighbors.

Troubleshoot BGP failover by correcting extended access-list 100 entries to align source and destination addresses for ISP links, validate failover with simulated outages and ping tests.

Troubleshooting redistribution between the branch and headquarters affects reachability to server 2, using show ip route, show ip protocols, and adjacency checks to identify routing issues.

Troubleshoot redistribution of OSPF into another protocol by assigning seed metrics, validating routing table entries, and using route maps, access lists, and show ip protocols to ensure proper advertising.