Troubleshooting

7.1 Troubleshoot and correct common problems associated with IP addressing and host configurations

7.2 Troubleshoot and resolve VLAN problems    
7.2.a Identify that VLANs are configured
7.2.b Verify port membership is correct
7.2.c Correct IP address is configured

7.3 Troubleshoot and resolve trunking problems on Cisco switches    
7.3.a Verify correct trunk states
7.3.b Verify correct encapsulation is configured
7.3.c Correct VLANs are allowed

7.4 Troubleshoot and resolve ACL issues    
7.4.a Verify statistics
7.4.b Verify permitted networks
7.4.c Verify direction
7.4.c [i] Interface

7.5 Troubleshoot and resolve Layer 1 problems    
7.5.a Framing
7.5.b CRC
7.5.c Runts
7.5.d Giants
7.5.e Dropped Packets
7.5.f Late Collisions
7.5.g Input/Output errors