In the Cisco Unified Contact Center Enterprise solution, if the private network fails but the visible network is still operational, which statement is true?

Question

Options

• AThe system stops routing calls because it cannot function without a private network.
• BThe private network data is rerouted automatically over the visible network.
• CBoth call routers go active and attempt to split the system until the private network is restored.
• DThe system continues to operate but with only one call router in simplex mode.

• A
  4% (1)
• B
  4% (1)
• C
  9% (2)
• D
  83% (19)

Explanation

Option D is correct because Cisco UCCE's duplex architecture uses the private network as a heartbeat/communication link between the two call routers (Side A and Side B). When this link fails, the system cannot safely confirm which side should be authoritative, so it intentionally drops to simplex mode - one router stays active and continues routing calls while the other stands down, preventing a "split-brain" conflict.

Why the distractors are wrong:

• A is wrong because the visible network is still up, so call routing continues - the system degrades gracefully rather than stopping entirely.
• B is wrong because UCCE does not automatically reroute private network traffic over the visible network; the two networks serve distinct architectural roles and are not interchangeable.
• C is wrong because this describes exactly what simplex mode is designed to prevent - having both routers go active simultaneously would cause a split-brain condition where each side independently tries to own the system, leading to conflicts.

Memory tip: Associate the private network with a "referee" between the two sides. If the referee goes silent, the system doesn't let both players claim victory - it picks one winner (simplex) and waits for the referee to return.

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