I remember a time when I came into a customer to fix a "network" problem. When I got there, I found that the CPU on several switches that were daisy chained together was pegged out to 100%. I couldn't even console in and get much of a response on the CLI. Ultimately, I found that the equipment wasn't sized correctly for the environment.
When you are an engineer looking at a customer environment, you have to make sure that you understand what is going on with the traffic (how much and what kind). You have to understand how many servers there are. How many users there are. How many remote site there are. How many wireless devices there "normally" are. How many Internet based applications there are. This list can go on and on. My point is that you have to size the network infrastructure correctly. If you don't, the customer is going to be very sad with you.
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