Every tool we need to demolish the R&S Troubleshooting section is located within the CISCO IOS itself. Whether it is the ping or traceroute utilities or any one of a plethora of show and debug commands. Everything you encounter on the exam can be solved with a logical targeted approach employing these commands. This argument makes one supposition however, you must be able to read and interpret the output. Whether that output is from the show ip ospf command or the results of debug ip routing. You will need to know when to use the tool, how to filter and prioritize its output; as well as how to make sense of the information it provides.