The three-tiered model is a network architecture that consists of three layers: the access layer, the distribution layer, and the core layer. Each layer has a specific function in the network, and the layers are designed to provide scalability, flexibility, and fault tolerance. The primary function of the core layer is switching. The core layer is responsible for providing high-speed connectivity between the distribution layer switches. It is designed to provide a high level of redundancy and fault tolerance, and to ensure that traffic flows quickly and efficiently through the network.

The three-tiered model is used for the LAN/VLAN. This three-layer model helps you design, implement, and maintain a scalable, reliable, and cost-effective network. Each of layers has its own features and functionality, which reduces network complexity. https://study-ccna.com/cisco-three-layer-hierarchical-model/#:~:text=This%20three%2Dlayer%20model%20helps,functionality%2C%20which%20reduces%20network%20complexity.

"Switching is the primary function of the core layer in the three-tiered model".

the core layer establish a full mesh topology with switches in distribution layer blocks

Routing. https://youtu.be/23H0nA-_4YE?list=PLG49S3nxzAnlCJiCrOYuRYb6cne864a7G&t=163 router symbol - https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQsKbkBJE7pdQl3MTo_-Vej-jszS_8QW2JW4tauMc-eNZw9l546X-ePk0yuyQSB82PTORg&usqp=CAU

D. Switching The primary function of the core layer in the three-tiered network design model is switching. The core layer is responsible for high-speed, high-capacity data switching to facilitate the rapid transfer of data between different parts of the network. It acts as the backbone of the network, providing a high-speed, low-latency, and highly available connection between various distribution layer switches. Routing, bridging, and repeating are more commonly associated with other layers in the network, while the core layer's main focus is on efficient switching of data.

per ChatGPT In the three-tiered network architecture model, the core layer is primarily responsible for high-speed switching. Therefore, the correct option is: D. Switching The core layer is designed to provide fast and efficient transportation of data across the network without performing many tasks related to packet manipulation or addressing. It serves as the backbone of the network, facilitating the rapid transfer of data between different segments of the network without imposing many processing requirements on the data itself.

The primary function of the core layer in the three-tiered model is to serve as the backbone of the network, where switching ends and routing begins¹. It provides high-speed, highly redundant forwarding services to move packets between distribution-layer devices in different regions of the network¹. (1) Networking Architecture | Network Implementations | Pearson IT .... https://www.pearsonitcertification.com/articles/article.aspx?p=3128870&seqNum=2. (2) Access, Distribution, and Core Layers Explained - ComputerNetworkingNotes. https://www.computernetworkingnotes.com/ccna-study-guide/access-distribution-and-core-layers-explained.html. (3) Cisco three-layer hierarchical model - Study-CCNA. https://study-ccna.com/cisco-three-layer-hierarchical-model/. While switching does occur within a network, it’s typically associated with the access layer and distribution layer. The access layer is where devices connect to the network, and the distribution layer is where policy-based connectivity occurs. In contrast, the core layer is the network’s backbone.

I meant to say the primary function of the core layer is switching. Not routing.

According to Cisco, it should be Layer 2 switches. Where are you guys getting “routing”?

I lean more towards its primary function being switching but core layer devices can also do routing. another dumb question with more than one possible answer

not switching, this is the primary function of the core layer. meaning routing, key word primary function

CompTIA Network+ study exam guide: Core Layer The core layer provides the interconnectivity between all of the network pods in the data center. These are highly redundant and very high-speed interconnection devices. The core switches are usually high-end chassis-based switches with full hardware redundancy as is used in the distribution layer. All of the distribution switches will be connected to redundant core switches to exchange traffic. The core devices can be either routers or switches, depending on the architecture of the data center backbone network, but they do not implement advanced features such as security since the job of the core is to exchange traffic with minimal delays.

A. Routing happens in core layer. This is the correct answer. Access are typically edge L2 switches that doesn't do routing. Distribution could be an L3 switch for uplink connections to the core but routing is not typically done in this layer

A. Routing.

The primary function of the core layer of the three-tiered model is switching. In a three-tiered network architecture, the core layer is responsible for high-speed, highly available switching of network traffic.

Three tiered network (top to bottom) Access Distribution Core Routing occurs in the core layer and switching in the access tier. Source: chatgpt