Monitoring the network forms an important part of the Network Management, assisting in visualization of the network behaviour in real time. Networks are growing extensively and managing this huge network is utterly challenging. Traffic engineering, quality of service, and anomaly detection also depend on network monitoring for decision making (1). In spite of the ever-increasing complicated networks there are a number of approaches proposed for network monitoring which help to reduce the extra overhead on the network, along with monitoring the entire network as efficiently as possible. This paper lists and studies a few of these Network Monitoring Approaches and also various applications of Network Monitoring.