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2.5 Given a scenario, troubleshoot common router and switch problems.
- Switching loop
- Bad cables/improper cable types
- Port configuration
- VLAN assignment
- Mismatched MTU/MUT black hole
- Power failure
- Bad/missing routes
- Bad modules (SFPs, GBICs)
- Wrong subnet mask
- Wrong gateway
- Duplicate IP address
- Wrong DNS
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