The origin of Mobile ad hoc network (MANET) was started in 1970 as packet radio\nnetwork (PRNET), later on different researches were made on it in different ages.\nMANET works under no fixed infrastructure in which every node works likes a router\nthat stores and forwards packet to final destination. Due to its dynamic topology,\nMANET can be created anywhere, anytime. As there are limited resources in MANET\nso it faces many problems such as security, limited bandwidth, range and power constraints.\nDue to this, many new routing protocols are proposed. This article examines\ndifferent techniques to manage congestion control, security issues, different layers\nattacks, routing protocols and challenges that are faced by MANET.
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