Error 404--Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

Covers objectives for the Cisco Internet Troubleshooting Support (642-831 CIT) exam, which counts towards CCNP certification.
The following information provides general guidelines for the content likely to be included on this exam. However, other related topics may also appear on any specific delivery of the exam.

Technology
-Identify troubleshooting methods
-Explain documentation standards and the requirements for document control

Implementation and Operation
-Establish an optimal system baseline
-Diagram and document system topology
-Document end system configuration
-Verify connectivity at all layers
-Select an optimal troubleshooting approach

Planning and Design
-Plan a network documentation system
-Plan a baseline monitoring scheme
-Plan an approach to troubleshooting that minimizes system downtime

Troubleshooting
-Use Cisco IOS commands and applications to identify system problems at all layers
-Isolate system problems to one or more specific layers
-Resolve sub-optimal system performance problems at layers 2 through 7
-Resolve local connectivity problems at layer 1
-Restore optimal baseline service
-Work with external providers to resolve service provision problems
-Work with system users to resolve network related end-use problems