Which layer provides routing and implements policies (filtering, security, and QoS)?
- core
- backbone
- distribution
- access
Explanation: The distribution layer acts as the primary service and control boundary between the access layer and the core in a hierarchical network design. Unlike the core layer, which is focused strictly on high-speed switching, the distribution layer is where routing and packet manipulation are specifically performed. It serves as a demarcation point for implementing policy-based connectivity, including filtering tasks, security policies, and Quality of Service (QoS). By handling these complex functions—such as summarizing routes from the access layer and isolating network problems—the distribution layer ensures that the core remains simple and efficient while providing necessary control over traffic flows throughout the campus environment.
Related exam: Modules 1 – 7: Checkpoint Exam: Network Switching Answers (CCNP ENCOR v9)
