Cisco
352-001 · Question #289
352-001 Question #289: Real Exam Question with Answer & Explanation
The correct answer is C: Client protection. In a DWDM ring topology carrying multiple services between two sites, client protection means the client-layer equipment at each end is responsible for detecting failures and switching to the alternate path around the ring.
Question
Refer to the exhibit. In the DWDM network, a ring topology carries multiple services between two sites. Which option describes the employed protection design?
Exhibit
Options
- AY-cable protection
- BSplitter protection
- CClient protection
- DUDLD
- EFEC protection
Explanation
In a DWDM ring topology carrying multiple services between two sites, client protection means the client-layer equipment at each end is responsible for detecting failures and switching to the alternate path around the ring.
Common mistakes.
- A. Y-cable protection uses a physical Y-shaped splitter to duplicate the transmit signal to two line cards simultaneously, which is a single-node point-to-point redundancy scheme and is not applicable to a ring topology serving multiple services.
- B. Splitter protection uses an optical power splitter to broadcast the same signal over two separate paths at once, typically applied in point-to-point or hub-and-spoke architectures rather than ring topologies serving multiple services between two sites.
- D. UDLD is a Cisco Layer 2 protocol that detects unidirectional Ethernet link failures; it is not a DWDM optical protection or switching mechanism.
- E. FEC (Forward Error Correction) is an optical modulation technique that corrects bit errors to improve signal quality over long spans; it does not provide path redundancy or protection switching in a ring topology.
Concept tested. DWDM ring client-layer protection design
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