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Modified, Exclusive, Shared and Invalid - MESI protocol meaning

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Here's what MESI stands for

Modified: The line in the cache has been modified (different from main memory) and is available only in this cache. 

Exclusive: The line in the cache is the same as that in main memory and is not present in any other cache. 

Shared: The line in the cache is the same as that in main memory and may be present in another cache.

Invalid: The line in the cache does not contain valid data.

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