If the user runs a network, they know how complaints start. Lowly users or high-placed executives come to the user complaining of lousy bandwidth, applications that freeze mid-transaction, phone calls breaking up, video scrambled and whatever the cause, it’s their fault. Often, even the most non-technical people have their own ideas about what’s wrong with the health of their network and how to fix it, which might involve switching telecom companies, buying more bandwidth or swapping out hardware. More often than not, these theories are hilariously misguided. Hardware issues can be either blazingly obvious (the router catches fire) or devilishly subtle (the intermittent failure that occurs only when they’re not around).