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

Fast transport is a core layer function - the core is designed for maximum switching speed with minimal latency and no policy decisions.

Reliability as a standalone concept is a general network engineering goal and is not assigned as a specific function of the distribution layer in the Cisco hierarchical design model.

QoS classification and marking is performed at the access layer - the ingress trust boundary - not at the distribution layer.

Fault isolation is a primary distribution layer function - it contains failures at the access layer and prevents them from propagating to the high-speed core.

Redundancy and load balancing are core distribution layer responsibilities, implemented via protocols like HSRP or VRRP and Layer 3 ECMP to provide resilient, high-availability paths between access and core.