The point of this first question is to make you think about how caching is similar and different at different levels of the memory hierarchy. A cache is a high speed memory containing recently or frequently used information.
Classical caches deal with local data only.
Unlike Internet caches, they do not deal with data outside their environment. Internet caches are concerned mainly with read only. A big difference between the data size and the type of data handled by these caches. Internet caches usually handle a variety of data. Patterns of document access.