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Cisco Networking Simplified, Second Edition by Paul Della Maggiora, Neil Anderson, Jim Doherty

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Chapter . Multicast and IPTV Broadcasts

Watching Movies Without Flooding the World

IP multicast is a bandwidth-conserving technology based on IP in which data intended for multiple receivers is efficiently transmitted with a single stream. IP multicast best serves streaming audio, video, and data applications such as software distribution or stock-quote broadcasts.

Consider this example: A corporate officer needs to deliver a live video broadcast to the company’s employees. Doing so across an IP network using traditional IP protocols would require that the video feed be replicated once for every user. For a branch office across a WAN link, 20 employees watching the video on their computers would result in the video stream being replicated 20 times ...

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