The first attempt must be done within 18 months. Then you must make another attempt within 12 months for the written to remain valid. If you do not pass the lab within 3 years you must retake the written.
There are few interoperability issues between 2960x and other vendors.
In this article we will go over the steps on how to debug these issues.
Check the phy id from “show controllers ethernet-controller phy” output.
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