Protocol Independent Multicast DEFINITION: Protocol-independent multicast (PIM) is a set of four specifications that define modes of Internet multicasting to allow one-to-many and many-to-many transmission of information. The four modes are: sparse mode (SM)dense mode (DM)source-specific multicast (SSM)bidirectional. The most common mode in PIM is the sparse mode. It is used for transmission of data to nodes in multiple Internet domains, where
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