The wireless sensor network is the decentralized type of network, the size of the sensor networks is very small due to which battery power of the nodes is limited. Due to self configuring nature of the wireless sensor networks, various type security attacks are possible in the network. The security attacks are broadly classified into active and passive attacks. The blackhole attack is the active type of attack which reduced the network efficiency in terms of various parameters. In this paper, various techniques has been reviewed which detect and isolate malicious nodes from the network
A wireless sensor network comprises of countless spread over a particular territory where we need to take care of at the progressions going ahead there. A sensor hub, for the most part, comprises of sensors, actuators, memory, a processor and they do have correspondence capacity. These sorts of networks are much powerless against security attacks. Many kinds of active and passive attacks are conceivable in the sensor network. Among all the conceivable active attacks, sinkhole attack is the most widely recognized and destructive attack. This attack debases network execution and prompts denial of service attack. The attack is triggered by the malicious hub which is available in the network. In this work, a novel strategy has been proposed to recognize and disengage malicious nodes from the network which are in charge of triggering the attack. The novel procedure is based on blacklist technique and clustering technique. The exploratory results will demonstrate that proposed strategy detects and separate the malicious nodes from the network proficiently. It will enhance network effectiveness as far as bundle misfortune, defer and expand throughput of the network. NS2 simulator instrument will be utilized as a part of it.
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