Which symptom is NOT associated with a network outage?

The symptom that is NOT associated with a network outage is having a full signal on all devices. When devices show a full signal, it typically indicates that they are connected to the network and receiving a strong signal from the access point or router. This scenario implies that there is no issue with the device's ability to connect to the network at that moment.

In contrast, symptoms like inability to access the internet, frequent buffering during video streaming, and intermittent connection indicate problems that could be related to network issues or outages. These symptoms suggest either a loss of connectivity or degraded performance, which are characteristic of a network outage. Therefore, having a full signal does not reflect any issues with the network itself, making it the correct choice as the symptom that is not associated with a network outage.