Which two traffic types commonly use the Real-Time Transport Protocol (RTP)?

The Real-Time Transport Protocol (RTP) is specifically designed for delivering audio and video over networks, making it essential for applications where timing is crucial. This includes voice communications, such as Voice over IP (VoIP), and video communications, such as video conferencing. RTP manages the delivery of these types of media streams in a way that maintains synchronization and minimizes latency, which is critical for real-time applications.

In the context of the chosen answer, both voice and video require efficient delivery and timely data transport to ensure a smooth experience for users. Therefore, the combination of these two traffic types is perfectly aligned with the purpose and functionality of RTP.

Other options include types of traffic that do not rely on the real-time capabilities provided by RTP. For instance, email and file transfers are not time-sensitive and do not require the same level of immediacy as voice and video streams, while web browsing does not necessitate the real-time transmission characteristics that RTP provides. This emphasizes why RTP is predominantly associated with voice and video applications.