300-320 · Question #99
300-320 Question #99: Real Exam Question with Answer & Explanation
The correct answer is A: core layer. Cisco's data center architecture uses a three-tier hierarchical model with layers named differently from the campus model. The three layers are: Core Layer (A) - provides high-speed, low-latency switching between aggregation blocks and connects to the WAN/Internet edge; Aggregati
Question
Options
- Acore layer
- Bdistribution layer
- Cservice layer
- Daggregation layer
- ELayer 2 domain sizing
- Faccess layer
Explanation
Cisco's data center architecture uses a three-tier hierarchical model with layers named differently from the campus model. The three layers are: Core Layer (A) - provides high-speed, low-latency switching between aggregation blocks and connects to the WAN/Internet edge; Aggregation Layer (D) - the convergence point for services such as load balancers, firewalls, and server farms, equivalent to the distribution layer in campus designs; and Access Layer (F) - where physical servers, blades, and virtualized hosts connect to the network. Note that 'Distribution Layer' (B) is campus terminology, not data center. 'Service Layer' (C) is sometimes discussed as a concept but is not one of the three formal architectural tiers. 'Layer 2 domain sizing' (E) is a design consideration, not a layer name.
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