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An ad hoc wireless network has a dynamic nature that leads to constant changes in its network topology. As a consequence, the routing problem becomes more complex and challengeable, and it probably is the most addressed and studied problem in ad hoc networks. Based on the routing information update mechanism Ad hoc wireless networks routing protocols are classified into Proactive, Reactive and Hybrid Routing Protocols. Out of these, Hybrid Routing Protocol combines the best futures of the first two categories. The Zone Routing Protocol (ZRP) is one of the hybrid routing protocols in which every network node proactively maintaining routing information about its routing zone, while reactively acquiring routes to destinations beyond the routing zone.
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