Questions about memcache distribution

Concerning the distributed memcache, the highlight of memcache is that it uses memory storage and is also distributed. As for this distributed architecture, I have some doubts. The so-called distributed architecture refers to the distributed architecture in the LAN, or the distribution of the Internet. The separation of images and Weibo content like Weibo is not called distributed. if so, I want to talk about the distributed memcache issue.
The highlight of memcache is that it uses memory storage and is also distributed. As for this distributed architecture, I have some doubts. The so-called distributed architecture refers to the distributed architecture in the LAN or the distributed architecture of the Internet.
The separation of images and Weibo content like Weibo is not called distributed. if so, it makes sense to say how distributed this is, because the client directly obtains the image from another image server;
For memcache, if the Internet is distributed, for example, my ip address is 222.222.222.222, and the other ip address is 222.222.222.221. If I distribute the cache on the machine 221, I may obtain data from the machine 221 to the machine 222 for processing dozens of times, even if the two computers are getting closer to each other, they are constantly connected to the Internet to obtain data. how many computers will be affected by the network?
If memcache's distribution is only distributed in the LAN, I think it is better to understand it. it must be fast, but it seems like distributed is too one-sided. What should we do about the distribution of memcache.

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Do you use vrouters for 222 and 221? Is the speed between you and the router at least G-level? Isn't the router too bad?
Rest assured that in this case, the network is not your bottleneck, and the computing capability is