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Mismatched MTU, Bad Modules, Power Failure and Missing Routes This lesson continues to cover trouble shooting common wire and switch issues and discusses the following:
Mis-matched Maximum Transmission Unit (MTU)/Black Hole: packets are too large for a certain 'hop' and are dropped. If no error about the packet is received, essentially we've hit a Black Hole.
Bad Modules (SFP, GBIC): Bad port module on device
Power Failure: Device may have lost power
Bad/missing routes: routing information is incorrect