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352-001 · Question #168

What are three key design principles when using a classic hierarchical network model? (Choose three.)

The correct answer is B. The core layer should be configured with minimal complexity. D. A hierarchical network design model aids fault isolation. F. A hierarchical network design facilitates changes.. The classic three-layer hierarchical model is defined by a simple, high-speed core, clear fault boundaries between layers, and a structure that makes adds, moves, and changes straightforward.

Designing Network Infrastructure

Question

What are three key design principles when using a classic hierarchical network model? (Choose three.)

Options

  • AThe core layer controls access to resources for security.
  • BThe core layer should be configured with minimal complexity.
  • CThe core layer is designed first, followed by the distribution layer and then the access layer.
  • DA hierarchical network design model aids fault isolation.
  • EThe core layer provides server access in a small campus.
  • FA hierarchical network design facilitates changes.

How the community answered

(33 responses)
  • A
    3% (1)
  • B
    94% (31)
  • C
    3% (1)

Why each option

The classic three-layer hierarchical model is defined by a simple, high-speed core, clear fault boundaries between layers, and a structure that makes adds, moves, and changes straightforward.

AThe core layer controls access to resources for security.

Security and resource access control are functions of the access layer and, to some extent, the distribution layer - not the core, which is optimized purely for fast packet switching.

BThe core layer should be configured with minimal complexity.Correct

The core layer must forward packets as fast as possible, so complexity such as access control lists, policy enforcement, or spanning-tree manipulation should be avoided there. Keeping the core simple improves both performance and stability.

CThe core layer is designed first, followed by the distribution layer and then the access layer.

The hierarchical model is designed from the access layer upward, starting with user and device requirements, not from the core downward.

DA hierarchical network design model aids fault isolation.Correct

Segmenting the network into distinct access, distribution, and core layers confines failures to a smaller domain - a problem at the access layer does not automatically propagate to the distribution or core - which directly aids fault isolation and troubleshooting.

EThe core layer provides server access in a small campus.

Server access is typically provided at the distribution or access layer in a campus design; the core layer exists solely to provide fast, reliable transport between distribution blocks.

FA hierarchical network design facilitates changes.Correct

Because each layer has a defined role and clear boundaries, adding new access switches or reconfiguring distribution-layer policy affects only the relevant layer, making the network easier to change without risk of cascading impact.

Concept tested: Hierarchical network model design principles - core, distribution, access

Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/campover.html

Topics

#hierarchical network model#core layer#fault isolation#campus design

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