400-007 · Question #60
What are two key design principles when using a hierarchical core-distribution-access network model? (Choose two )
The correct answer is A. A hierarchical network design model aids fault isolation D. A hierarchical network design facilitates changes. The hierarchical network model provides fault isolation and ease of change as its two primary design benefits. Security enforcement and server access belong to the distribution and access layers, not the core.
Question
What are two key design principles when using a hierarchical core-distribution-access network model? (Choose two )
Options
- AA hierarchical network design model aids fault isolation
- BThe core layer is designed first, followed by the distribution layer and then the access layer
- CThe core layer provides server access in a small campus.
- DA hierarchical network design facilitates changes
- EThe core layer controls access to resources for security
How the community answered
(20 responses)- A95% (19)
- C5% (1)
Why each option
The hierarchical network model provides fault isolation and ease of change as its two primary design benefits. Security enforcement and server access belong to the distribution and access layers, not the core.
Fault isolation is a fundamental benefit of the hierarchical model because each layer has a clearly defined role, allowing problems at the access or distribution layer to be identified and contained without impacting the entire network.
Hierarchical design is built from the access layer inward - access layer requirements are defined first, then distribution, and finally core - not from the core outward.
In a small campus, server access is provided at the distribution or access layer; the core layer is reserved for high-speed backbone switching, not server connectivity.
Facilitating changes is a core advantage because the modular, layered structure allows upgrades or reconfigurations at one layer without disrupting other layers, reducing the scope and risk of modifications.
Access control and security policy enforcement are functions of the distribution layer via ACLs and routing policies, not the core layer, which is optimized purely for speed and forwarding performance.
Concept tested: Hierarchical network design model benefits and layer roles
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/campover.html
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