The simplest way to view it is, ironically, to think of it like the actual street/highway system. If you live on a small dirt road out in the middle of nowhere, then a big problem that requires road ~~destruction~~ *construction* can cause huge problems for you being able to actually get to your house. If, on the other hand, there’s road construction on some major thoroughfare through a city, there’s *usually* a bazillion other ways to get to where you’re going, they just take longer or require more left turns or the like.
So if any problem occurs at at any of the “early” stages of your connection (before it gets into the wider internet infrastructure), you may be stuck, because there’s only a very small number of routes to get to *your specific house,* even though there’s a bazillion ways to get from Information Highway 5 to Any Random Web Address.
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