Technologies used in E-IGRP:
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neighbor discovery / recovery - dynamically learns about other routers in directly attached networks( periodically exchanged small hello packets)
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reliable transport protocol (RTP) - responsible for guaranteed delivery of E_IGRP packets to all neighbors
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protocol dependent modules - used for network layer protocol-specific requirements
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DUAL finite-state machine - tracking all routers and selecting efficient, loop-free paths
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