A customer is comparing the benefits of synchronous and asynchronous replication for a two data center replication strategy. They decide to implement a synchronous solution. Why is this a correct…

Question

Options

• AIt provides the best data currency.
• BIt incurs the least propagation delays over long distances.
• CIt gives the best protection against regional disasters.
• DIt provides journaling capabilities.

• A
  87% (55)
• B
  8% (5)
• C
  2% (1)
• D
  3% (2)

Explanation

Synchronous replication ensures every write is confirmed on both data centers before the transaction is acknowledged, meaning the secondary site always has an exact, up-to-the-moment copy - this is "best data currency" (A). Option B is wrong because synchronous replication actually suffers from propagation delays over long distances, since it must wait for acknowledgment from the remote site before completing each write. Option C is a distractor because both synchronous and asynchronous replication can protect against regional disasters; the key differentiator here is data freshness, not disaster protection scope. Option D is wrong because journaling is a separate feature related to transaction logging, not a characteristic of replication mode.

Memory tip: Think of "synchronous = synchronized watches" - both sites tick at exactly the same time, so data is never behind. Asynchronous is like mailing a letter: the remote site eventually catches up, but there's always a lag.

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