Which three options correctly associate a layer of the hierarchical design model with the function of that layer? (Choose three.)

Which three options correctly associate a layer of the hierarchical design model with the function of that layer? (Choose three.)

• Core - end device connectivity
• Distribution - aggregation and traffic control
• Access - end device connectivity
• Distribution - high speed backbone
• Access - aggregation of traffic
• Core - high speed backbone

Explanation:

Access Layer:
The access layer represents the network edge, where traffic enters or exits the campus network. Traditionally, the primary function of an access layer switch is to provide network access to the user. Access layer switches connect to distribution layer switches, which implement network foundation technologies such as routing, quality of service, and security.

Distribution Layer:
The distribution layer interfaces between the access layer and the core layer to provide many important functions, including:
- Aggregating large-scale wiring closet networks
- Aggregating Layer 2 broadcast domains and Layer 3 routing boundaries
- Providing intelligent switching, routing, and network access policy functions to access the rest of the network
- Providing high availability through redundant distribution layer switches to the end-user and equal cost paths to the core
- Providing differentiated services to various classes of service applications at the edge of the network

Core Layer:
The core layer is the network backbone. It connects several layers of the campus network. The core layer serves as the aggregator for all of the other campus blocks and ties the campus together with the rest of the network. The primary purpose of the core layer is to provide fault isolation and high-speed backbone connectivity.

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