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352-001 · Question #656
352-001 Question #656: Real Exam Question with Answer & Explanation
The correct answer is D: To prevent loops on Ethernet rings.. G.8032 (Ethernet Ring Protection Switching) is selected in ISP designs to prevent forwarding loops on Ethernet ring topologies by blocking one designated link under normal operation.
Question
Which design criteria drives the selection of G.8032 in an ISP network design?
Options
- ATo gradually degrade the Ethernet rings' performance when it becomes saturated.
- BTo make full use of Ethernet rings' redundant paths.
- CTo achieve fast failover between two upstream Ethernet ring paths to the network core.
- DTo prevent loops on Ethernet rings.
Explanation
G.8032 (Ethernet Ring Protection Switching) is selected in ISP designs to prevent forwarding loops on Ethernet ring topologies by blocking one designated link under normal operation.
Common mistakes.
- A. G.8032 provides binary protection switching and does not gradually degrade performance when the ring becomes congested.
- B. G.8032 does not simultaneously use both redundant ring paths - the RPL is intentionally blocked under normal conditions, so full bandwidth utilization of both paths is not achieved.
- C. Fast failover under 50ms is a capability of G.8032, but it is a secondary benefit - the fundamental design criterion driving its selection in ring topologies is loop prevention, not failover speed alone.
Concept tested. G.8032 Ethernet Ring Protection Switching loop prevention
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