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Multicast

Introduction

Multicast is a bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream of information to thousands of corporate recipients and homes. Applications that take advantage of multicast technologies include video conferencing, corporate communications, distance learning, and distribution of software, stock quotes, and news.

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Internet Group Management Protocol (IGMP)
Internet Group Management Protocol (IGMP) is a protocol used by IPv4 systems to report IP multicast memberships to neighboring multicast routers.