300-320 · Question #99
Which three options are the three layers of the Cisco design in the data center architecture? (Choose three.)
The correct answer is A. core layer D. aggregation layer F. access 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…
Question
Which three options are the three layers of the Cisco design in the data center architecture? (Choose three.)
Options
- Acore layer
- Bdistribution layer
- Cservice layer
- Daggregation layer
- ELayer 2 domain sizing
- Faccess layer
How the community answered
(42 responses)- A95% (40)
- B2% (1)
- E2% (1)
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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