Question: In a 5G network, what is a key aspect of Service Function Chaining (SFC) policies for traffic steering, as per the service requirements?
Option 1: SFC policies can only be defined on a per-UE basis, without application-specific differentiation.
Option 2: SFC policies must treat upstream and downstream traffic identically to simplify network management.
Option 3: The coexistence of traffic with and without SFC is not supported to ensure QoS consistency.
Option 4: SFC policies can distinguish between upstream and downstream traffic, enabling more granular control.
Explanation: This correct answer highlights a crucial requirement for Service Function Chaining in 5G networks - the ability of SFC policies to differentiate between upstream and downstream traffic. This differentiation is vital for optimizing network resource utilization, enhancing Quality of Experience (QoE), and allowing for more precise traffic management based on the direction of data flow. Such granular control is essential for meeting the diverse service requirements in 5G ecosystems.