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400-007 · Question #162
400-007 Question #162: Real Exam Question with Answer & Explanation
The correct answer is D: Fault isolation. The distribution layer in the three-layer hierarchical model is responsible for fault isolation, redundancy, and load balancing - acting as the aggregation boundary between the access and core layers.
Question
Which actions are performed at the distribution layer of the three-layer hierarchical network design model? (Choose two)
Options
- AFast transport
- BReliability
- CQoS classification and marking boundary
- DFault isolation
- ERedundancy and load balancing
Explanation
The distribution layer in the three-layer hierarchical model is responsible for fault isolation, redundancy, and load balancing - acting as the aggregation boundary between the access and core layers.
Common mistakes.
- A. Fast transport is a core layer function - the core is designed for maximum switching speed with minimal latency and no policy decisions.
- B. Reliability as a standalone concept is a general network engineering goal and is not assigned as a specific function of the distribution layer in the Cisco hierarchical design model.
- C. QoS classification and marking is performed at the access layer - the ingress trust boundary - not at the distribution layer.
Concept tested. Distribution layer functions in three-layer hierarchical model
Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/campdesign4.html
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