Implementation Manager (IM) Specialist CHTS Practice Test

Which OSI Model layer is associated with MAC addresses, LANs, and frames?

1. Network Layer

2. Application Layer

3. Datalink Layer

4. Transport Layer

The correct answer is: Datalink Layer

The correct answer is the Datalink Layer, which is the second layer of the OSI (Open Systems Interconnection) model. This layer is responsible for node-to-node data transfer and includes protocols that help in delivering frames between devices over the same local area network (LAN). It manages how data packets are placed on the network and received from the network, which is primarily facilitated through the use of MAC (Media Access Control) addresses. The Datalink Layer ensures that the data is transferred reliably between the adjacent nodes, taking care of error detection and correction, frame synchronization, and addressing through MAC addresses. These addresses are crucial for identifying devices on the same local network, allowing for proper communication between them. Understanding the purpose of other OSI layers provides clarity on why they are not the right choice. The Network Layer is more focused on routing and forwarding packets across different networks and utilizes IP addressing rather than MAC addresses. The Application Layer interacts with end-user software and is responsible for high-level protocols. Lastly, the Transport Layer translates between the network and application layers, managing end-to-end communication and data flow, but does not directly handle frames or MAC addresses. Thus, the role of MAC addresses, frames, and data handling for LANs distinctly