I. Introduction
The purpose of network monitoring is to support proper management operations [1] . Monitoring provides a view of the network status and illustrates network behavior, which is a basis for further management operations such as traffic engineering [2], quality of service (QoS) [3], and anomaly detection [4] . In computer networks, the operation model [5] is a stackable architecture with different layers, linking numerous hosts for data exchange. To satisfy various management purposes, network monitoring helps network operators to obtain operation and usage statistics.