These 2 questions revolves around Troubleshooting and Maintaining Cisco IP Networks: First hop redundancy protocols are used to provide redundancy...

These 2 questions revolves around Troubleshooting and Maintaining Cisco IP Networks:

1. First hop redundancy protocols are used to provide redundancy and STP is used loop free path. Discuss some issues with this implementation. Could you concurrently use both protocols? Why or Why not?
2. Please write two paragraphs about the most efficient way to troubleshoot and diagnosis layer 3 issues. Feel free to assume an example to explain your scenario.

Please provide references for each question.