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DDR: Dial-on-demand routing

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Dial-on-Demand Routing is a Cisco-developed routing strategy that requires a user to use existing telephone lines, or public circuit-switched networks, to form a WAN rather than lines directly dedicated to the WAN. Users that do not require permanent, persistent connections between locations on the WAN usually enforce DDR because the amount of traffic over the WAN is low. The transmissions are intermittent instead of constant. Only when data is transmitted to the remote site does the link become operational. The connection is disconnected when no information has been shared over the link for a specified period.

DDR acronym: Dial-on-demand routing
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