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When troubleshooting a Layer 2 problem, which of the following should not be checked?
Registers and counters
MAC address table
Access Control List
VLANs
Spanning Tree Protocol
Layer 2 deals with the movement of frames. To troubleshoot a layer 2 problem look for issues on the MAC address table, VLANs, STP, Registers and counters, among others. The Access Control List "ACL" is a layer 3 function which deals with IPs on a routing level.
For more information refer to: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/troubleshooting/guide/N5KTroubleshootingGuide/n5Ktsl2.html
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