1. Troubleshooting Switch Performance Issues
   1. Port Errors
      1. Errors
         1. Align-Err
         2. FCS-Err
         3. Xmit-Err
         4. Rcv-Err
         5. UnderSize
         6. Single-col
         7. Multi-Col
         8. Late-Col
         9. Excess-Col
         10. Carri-Sen
         11. Runts
         12. Giants
   2. Mismatched Duplex Settings
   3. TCAM Troubleshooting
      1. Reasons for packet Punted
      2. Solution
   4. High CPU Utilization
2. Router Performance
   1. Troubleshooting Router Performance Issues
      1. Excessive CPU Utilization
      2. Net Background process
      3. IP Background process
      4. TCP Timer process:
   2. Commands for Troubleshooting High CPU Utilization
3. Packet-Switching Modes (Routers and Multilayer Switches)
   1. Operation of Process Switching
   2. Operation of Fast Switching (Route Caching)
   3. Operation of Cisco Express Forwarding (Topology-Based Switching)
4. Troubleshooting Packet-Switching Modes (commands)
5. list of troubleshooting steps for router
6. Excessive Memory Utilization
   1. Memory Leak
   2. Memory-Allocation Failure
   3. Buffer Leak
   4. Excessive BGP Memory Use
7. Floating Topic