Troubleshoot and correct common problems associated with IP addressing and host configurations
Troubleshoot and resolve VLAN problems
Identify that VLANs are configured
Verify port membership correct
Correct IP address configured
Troubleshoot and resolve trunking problems on Cisco switches
Verify correct trunk states
Verify correct encapsulation configured
Correct VLANs allowed
Troubleshoot and resolve
ACL issues
Verify statistics
Verify permitted networks
Verify direction
(i) Interface
Troubleshoot and resolve Layer 1 problems
Framing
CRC
Runts
Giants
Dropped packets
Late collisions
Input/output errors
Identify and correct common network problems
Troubleshoot and resolve spanning tree operation issues
Verify root switch
Verify priority
Verify mode is correct
Verify port states
Troubleshoot and resolve routing issues
Verify routing is enabled (sh ip protocols)
Verify routing table is correct
Verify correct path selection
Troubleshoot and resolve OSPF problems
Verify neighbor adjacencies
Verify hello and dead timers
Verify OSPF area
Verify interface MTU
Verify network types
Verify neighbor states
Review OSPF topology table
Troubleshoot and resolve EIGRP problems
Verify neighbor adjacencies
Verify AS number
Verify load balancing
Split horizon
Troubleshoot and resolve interVLAN routing problems
Verify connectivity
Verify encapsulation
Verify subnet
Verify native VLAN
Port mode trunk status
Troubleshoot and resolve WAN implementation issues
Serial interfaces
Frame relay
PPP
Monitor NetFlow statistics
TS EtherChannel problems