By Stefano Basagni; et al
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Mobile wireless networks are generally more vulnerable to information and physical security threats than fixed-wireline networks. The use of open and shared broadcast wireless channels means nodes with inadequate physical protection are prone to security threats. In addition, because a mobile ad hoc network is a distributed infrastructureless network, it mainly relies on individual security solution from each mobile node, as centralized security control is hard to implement. 9. Network Scalability.
Important aspects that need to be considered  during simulation include the definition of the simulated area in which users’ movements take place, the rules for modeling users that move beyond the simulated area, the number of nodes in the simulated area, the node mobility model, and the allocation of nodes at the simulation start-up, and so on. Typically, simulation studies consider a fixed number of users that move inside a closed rectangular area. Rules are defined for users arriving at the edges of the area.
A large number of location-aware algorithms have been proposed in the literature since then. As represented by [186–189], these protocols typically fall into three main strategies: greedy forwarding, directed flooding, and hierarchical routing. Greedy forwarding and directed flooding algorithms forward the packet to one or more neighbors, respectively. 4. TECHNICAL CHALLENGES AND RESEARCH OVERVIEW 25 based routing algorithms. Proposed greedy forwarding algorithms include The Most Forward within Radius policy (MFR) , the Nearest with Forward Progress scheme (NFP)  and the compass routing scheme ; representative directed flooding algorithms include DREAM  and LAR ; and representative hierarchical routing algorithms include the Grid Routing  and the Terminode Routing protocols .
Ad hoc networking by Stefano Basagni; et al