The document discusses different types of node behavior in wireless sensor networks. There are normal nodes that work well under ideal conditions. Failed nodes are unable to operate due to power failure or environmental events. Badly failed nodes transmit false routing messages like failed nodes. Selfish nodes are unwilling to cooperate as required by protocols. Malicious nodes disrupt correct routing protocol operation. Dynamic misbehavior can occur when communication range shrinks in adverse environments, causing nodes to sense data but be unable to transmit it temporarily.