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IPTV content is often delivered over a managed or dedicated network, like Digital Subscriber Line connectivity. Compared to the public internet, a private network gives network operators more control over the video traffic and, by extension, the ability to ensure quality of service, uptime, bandwidth and reliability. In traditional television delivery, all programming is broadcast simultaneously in a Multicast format. The available program signals flow downstream, and viewers select programs by changing the TV channel.

An IPTV service, by contrast, sends only one program at a time, i.e., a unicast format. Content remains on the internet service provider's network, and only the program the end user selects is sent to the user's device. When a viewer changes the channel, a new stream is transmitted from the provider's server directly to the viewer. Like cable television, Best iptv requires a set-top box or other customer premises devices, such as a Wi-Fi router or a fibre optic or broadband internet connection.

IPTV primarily uses IP multicasting with Internet Group Management Protocol for IPv4-based live television broadcasts and Real-Time Streaming Protocol for on-demand programs. Multicast Listener Discovery is used on IPv6 networks. Other common protocols include Real-Time Messaging Protocol and Hypertext Transfer Protocol.