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Cache coherence protocols are essential for ensuring consistency in data across multiple cores in a shared memory architecture. In multi-core systems, each core typically has its own private cache. If one core modifies data in its cache, other cores accessing the same memory region must be updated to maintain consistency. Protocols like MESI (Modified, Exclusive, Shared, Invalid) handle these updates efficiently, reducing the risk of data inconsistencies and improving system performance. Without proper cache coherence, applications running on multi-core processors could experience errors, bottlenecks, or degraded performance due to stale or inconsistent data being accessed. Why Other Options Are Incorrect:
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