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Having worked in the support sell for dedup appliances in the past year or so I've learned that there's a great lack of understanding with regards to Ethernet technologies. A common example of it is a customer who replaces a vintage VTL appliance once you get your "fast" NAS based backup appliance. They read a marketing and advertising document stating that this new NAS dedup appliance can do approximately 650 MB/s, purchase it and connect it for their LAN using multiple 1 GbE ports. They start backups to discover that their performance is well below those of both the or 4 GBs fiber channel VTL that they had just replaced. Eventually they've created an appointment to the vendor complaining concerning the speed.
I'll be honest, the written exam I took was laughable at best. I'm not wanting to undermine anyone around or perhaps the test makers themselves however, many of such questions were way too easy. Don't get me wrong though, whilst you will likely possess a question that asks: "Which has more protection, a motorcycle or perhaps a car?", it is possible to other questions that ask the specifics about motorcycles and certain motorcycle laws which could not understood. So brush up on the book or whatever resources this helps you and pass the written exam.
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