A description of the network layer monitoring on the basis of the Netflow system. The micro-course describes how to create procedures of collecting network statistics, what the Netflow protocol is, what its versions are and where they are used. Moreover, simple tools used for monitoring network interfaces were described.
Keywords: iptraf, stark, etherape bmon, iptotal, netflow, ipfix, frame, netflow v5, próbnik NetFlow, OAM, OAM&P