Final answer:
Rafael's frustration with the server being down for his quiz is an example of a technological barrier in communication, impacting his academic progress and engagement.
Step-by-step explanation:
The listening barrier illustrated by Rafael's frustration with the server being down for his online communication class quiz is a technological barrier. Technological barriers in communication often arise due to malfunctions or the absence of appropriate technology, which can severely impact not only the ability to communicate but also the effectiveness of learning and business operations. In the case of Rafael, his preparedness and ability to take the quiz are impeded by the server outage, thus creating an obstacle to his academic progress and engagement in the learning activity.