2.0 Network Installation and Configuration


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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