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Chapter 11
Troubleshooting Switched Ethernet
Key Terms
Before you take the exam, be certain you are familiar with the following terms:
802.1q
broadcast domain
Cisco Discovery Protocol
collision domain
EARL (Encoded Address Recognition Logic ASIC)
Inter-switch Link (ISL)
Remote Monitoring (RMON)
SAGE (Synergy Advanced Gate-Array Engine)
SAINT (Synergy Advanced Interface and Network Termination)
SAMBA ASIC
spanning tree
Virtual LANs (VLANs)
VLAN Trunking Protocol (VTP)
Command
Description
show span
Shows spanning tree information
from the router. Very different
from a show span on a switch.
show bridge {vlan number}
Shows which bridging
encapsulations are enabled.
show arp
Displays the ARP information for
the router.
debug vlan packet
Debugs VLAN packets.
debug span
Debugs spanning tree.
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