Invalidation vs. Update-based Protocols.
(a) As miss latencies increase, does an update protocol become more or less preferable to an invalidation-based protocol? Explain.
(b) In a multilevel cache hierarchy, would you propagate updates all the way to the first-level cache or only to the second-level cache? Explain the trade-offs.

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The Answer of Invalidation vs. Update-based Protocols.
(a) As miss latencies increase, does an update protocol become more or less preferable to an invalidation-based protocol? Explain.
(b) In a multilevel cache hierarchy, would you propagate updates all the way to the first-level cache or only to the second-level cache? Explain the trade-offs.

Invalidation Vs. Update-Based Protocols