A cabinet or room in a datacenter can have multiple “WAN connections” going into it, except each is essentially a transit line to a different ISP. In our case, a singlemode fiber cable comes via a 1310nm SFP LC module. Then you start an eBGP session to advertise your IP address space out into the world. This is a separate concept from paying for the transit itself, and an organization must register with an RIR before doing so. For example, our Autonomous System Number is AS13362 and this allows us to acquire IP blocks that we advertise rather than getting them leased. Once you have peering set up, the craft of the network engineer becomes more of an art than a science. Inbound and outbound traffic levels can be monitored and routed in such a way as to find the path of least resistance. If the transition off the cloud is partial or done in steps, you can even make direct connections to hyperscalers 13.
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