An engineer must propose a QoS architecture model that allows an application to inform the network of its traffic profile and to request a particular type of service to support its bandwidth and…

DiffServ (Differentiated Services) classifies and marks traffic based on per-hop behaviors, but it does not provide end-to-end guarantees or allow applications to reserve resources.

LLQ (Low Latency Queuing) is a queuing mechanism that prioritizes time-sensitive traffic but is a component of a QoS strategy, not an architecture model for application signaling and end-to-end guarantees.

WRED (Weighted Random Early Detection) is a congestion avoidance mechanism that randomly drops packets to prevent global synchronization, but it does not offer bandwidth guarantees or allow applications to request service types.

IntServ is a resource reservation model where applications use protocols like RSVP (Resource ReSerVation Protocol) to explicitly request and reserve network resources, including specific bandwidth and delay. This architecture provides end-to-end quality of service guarantees, ensuring consistent and dedicated bandwidth for the application's traffic profile.