1.3.a Use IOS troubleshooting tools
There are two categories of troubleshooting tools that are out there. One that help you troubleshoot IOS related issues but they are web based (E.g. Cisco Output Interpreter), the others are built-in tools that are part of Cisco IOS itself and help a router or switch administrator troubleshoot a network. Example of IOS based tools are ping, traceroute, and show and debug CLIs.
Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 1337-1340). . Kindle Edition.