State and Configuration

Having spent my entire career with Cisco (working with IOS and NX-OS), until recently, I never realized there was a difference between the state of a system and the configuration applied to it.

Now that I spend my days in Linux I see there is a difference between the two.

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Understanding EtherType

We know every ethernet frame has a source and destination MAC address, but most of us probably don’t think about the third field in the header, the ethertype. In frame or packet headers every field (usually) has a reason for being, the ethertype’s purpose is a surprisingly important one.

Ethernet Frame

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