300-320 Question #498: Real Exam Question with Answer & Explanation

The correct answer is B: 1 to 4. In Cisco's hierarchical network design model, the standard oversubscription ratio between the aggregation (distribution) layer and the core layer is 4:1. This means for every 4 units of aggregation-layer bandwidth, there is 1 unit of core-layer bandwidth. This ratio balances cost

Question

What is the correct oversubscription ratio between aggregation and core layer?

Options

A1 to 2
B1 to 4
C1 to 8
D1 to 10

Explanation

In Cisco's hierarchical network design model, the standard oversubscription ratio between the aggregation (distribution) layer and the core layer is 4:1. This means for every 4 units of aggregation-layer bandwidth, there is 1 unit of core-layer bandwidth. This ratio balances cost efficiency with performance. The core layer is designed for high-speed forwarding with minimal latency, and the 4:1 ratio is the Cisco-recommended guideline that prevents the core from becoming a bottleneck while avoiding unnecessary over-provisioning.

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