300-320 · Question #634
300-320 Question #634: Real Exam Question with Answer & Explanation
The correct answer is A: The core layer is always recommended.. The core layer is always a valid and recommended option in campus design (A) because it provides a high-speed, low-latency backbone between distribution blocks. More specifically, the core layer is recommended - and becomes operationally justified - when there are three or more d
Question
Options
- AThe core layer is always recommended.
- BCollapsed core/distribution is the most recommended design model.
- CThe core layer is recommended when you have three or more distribution blocks.
- DThe core layer is recommended when you have five or more distribution blocks.
Explanation
The core layer is always a valid and recommended option in campus design (A) because it provides a high-speed, low-latency backbone between distribution blocks. More specifically, the core layer is recommended - and becomes operationally justified - when there are three or more distribution blocks (C). With fewer than three distribution blocks, a collapsed core/distribution design is typically sufficient and avoids the extra cost of dedicated core hardware. Option B is incorrect because collapsed core is not universally 'most recommended' - the right model depends on scale. Option D is wrong; the threshold is three or more distribution blocks, not five.
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