Which two functions are performed at the distribution layer of the three-layer hierarchical network design model? (Choose two)

Fast transport is a defining characteristic of the core layer, which is optimized for high-speed, low-latency packet switching with minimal policy processing overhead.

QoS classification and marking is a function of the access layer in modern campus designs, performed as close to the traffic source as possible so that policy is enforced at the edge.

Fault isolation, while sometimes associated with network segmentation, is not identified as a primary defining function of the distribution layer in the hierarchical model compared to redundancy and reliability.

The distribution layer aggregates multiple access layer uplinks and uses redundant links with load-balancing mechanisms such as HSRP, ECMP, or STP to eliminate single points of failure between the access and core layers.

Reliability at the distribution layer is achieved through redundant hardware, dual uplinks, and resilient routing protocols, ensuring continuous service availability and predictable failover for traffic traversing between access and core.