Application Quality of Experience (AppQoE) is a feature that monitors application traffic and enforces service level agreements (SLAs) between two endpoints. To enable this functionality, two primary requirements must be met. First, AppQoE must be deployed between two supported Juniper devices, which include both SRX Series Firewalls and MX Series Routers. Second, because AppQoE relies on deep packet inspection to identify applications, a valid application security feature license (which enables AppID) must be installed on the devices. These two elements—supported hardware endpoints and the necessary license—are the foundational prerequisites for enabling AppQoE.

A. You need two SRX Series device endpoints. This is incorrect because it is too restrictive. AppQoE is also supported on MX Series devices, which can act as endpoints.

D. You need to configure AppQoE for reverse traffic. This is a configuration detail within an AppQoE policy, not a prerequisite for enabling the feature itself.

1. Juniper Networks TechLibrary. (2023). Application Quality of Experience (AppQoE) Overview. "AppQoE is supported on SRX Series Firewalls and MX Series 5G Universal Routing Platforms." This statement confirms that both SRX and MX Series devices are supported endpoints.

2. Juniper Networks TechLibrary. (2023). Application Quality of Experience (AppQoE) Overview. "To use AppQoE

you must install the application identification feature license (application security license bundle)." This statement explicitly confirms the license requirement.