Unicast: each client requiring multimedia content needs an individual data flow. Broadcast: multimedia content is sent to all the network clients independently of whether they want it or not. Multicast: this only requires a minimum bandwidth as only those clients wanting the multimedia content receive the data flow.
Frontmatter - Multimedia Multicast on the Internet - Wiley Online Library
Multicast Addressing A multicast address is associated to a group of clients specifying an interest in receiving a multimedia content dataflow. Clients specify they belong to a group by sending an IGMP message to their nearest router. PIM-SM has two types of distribution trees: Shared tree: traffic source is a Rendezvous-Point RP node, which concentrates all traffic destined to the same multicast group regardless of which server sourced the traffic.
- Difference between Unicast Vs Multicast | Haivision.
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PIM-SM: Drawbacks As already said, PIM-SM does avoid the problems other multicast routing protocols have; however it can give rise to congestion problems in the network due to traffic concentration in the shared trees, which may lead to packet loss. About the author Noelia Moro. Share this post Twitter.
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Join us on our journey Platform update page Visit emeraldpublishing. However, this is highly inefficient, since multiple copies of the same data are sent from the source through one or more networks.
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Multicasting enables a single transmission to be split up among multiple users, significantly reducing the required bandwidth. Multicasts that take place over the Internet are known as IP multicasts, since they use the Internet protocol IP to transmit data. IP multicasts create "multicast trees," which allow a single transmission to branch out to individual users.
These branches are created at Internet routers wherever necessary. For example, if five users from five different countries requested access to the same stream, branches would be created close the original source. If five users from the same city requested access to the same stream, the branches would be created close to users.
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