It contains set of protocols that determine path of traffic that flow in order to multiple network across different routers. It gives router data flow from source to destination. This routing protocol will help the router to create forwarding table.
By using these forwarding table it will correlates final destination with forward table. If the router is unable to forward a packet then troubleshooting is required to find the cause.
Trouble shouting is related to network maintenance. Quick resolution of the problem leads to reduction in network downtime.