You are about to perform a Tech refresh upgrade for a customer. The customer wants more details about how the historical data is maintained. The customer has two sides each with a router, logger…

Question

Options

• AThe routers exchange historical data to keep themselves up to date and each router keeps its local HDS-DDS up to date.
• BThe loggers exchange historical data to keep themselves up to date and each router keeps its local HDS-DDS up to date.
• CEach side synchronized its data from the logger using SQL replication.
• DThe HDS-DDSs continuously synchronized the historical data to keep themselves up to date.

• A
  5% (2)
• B
  74% (31)
• C
  14% (6)
• D
  7% (3)

Explanation

Option B is correct because in this dual-sided architecture, the loggers are the components responsible for collecting and maintaining historical data - they peer with each other to stay synchronized, and each router then pushes that synchronized data to keep its local HDS-DDS current.

Why the distractors fail:

• A is wrong because routers handle traffic routing and data forwarding, not historical data exchange - that responsibility belongs to the loggers.
• C is wrong because the synchronization mechanism here is not SQL replication from the logger; that describes a different technology approach entirely.
• D is wrong because the HDS-DDSs are recipients of updates, not active peers that synchronize directly with each other - they depend on the router to keep them current.

Memory tip: Think "Loggers Link, Routers Refresh" - Loggers exchange historical data with each other (Link), and Routers use that data to Refresh their local HDS-DDS. The logger is the historian; the router is the librarian who stocks the local shelf.

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