If you are thinking in the context of the Crowdstrike outage and not just details of networking technology, there are several points of concentrated risk. In addition to the networking points mentioned already: DNS. BGB. major operating systems and near ubiqutous third-party applications (ie Crowdstrike) all come to mind. Each could have an outsized impact and cause serious disruptions to usage of the internet in the modern sense.
Lots of resiliancies/resources are poured into things like this (usually), so fragile isn’t necessarily the right word, but they are all narrower points of failure than most people think about. Much of what modern life depends on involves stacks of these kinds of risk dependencies.
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