Name a common protocol used for video streaming in Milestone systems.

Real-Time Streaming Protocol (RTSP) is a common protocol utilized for video streaming, particularly in Milestone systems. It is designed specifically for controlling the delivery of streaming media, allowing users to pause, play, and stop media provided over a network. RTSP facilitates low-latency and efficient streaming, which is crucial for surveillance and real-time video applications found in systems like those offered by Milestone.

In Milestone's context, RTSP is essential because it supports the real-time transmission of video from cameras to viewing clients, ensuring that users can access live feeds quickly and reliably. This protocol supports both unicast and multicast streaming, enabling flexibility based on network capacity and user needs.

In contrast, the other protocols mentioned do not serve the same specific purpose as RTSP. HTTP, while commonly used for web traffic, is not optimized for real-time media transmission. FTP is primarily for file transfers and lacks the real-time capabilities required for streaming. SNMP is designed for network management, making it unrelated to the streaming of video content. Therefore, RTSP stands out as the most appropriate choice for video streaming in Milestone systems.