Abstract: A network risk analysis method using an information hierarchy structure is divided into 7 steps and results derived from each of the process steps are stored in a database to get a hierarchy structure for the respective steps. By using the information hierarchy structure, a network manager can easily comprehend the relationship between the derived results from each step to make a risk analysis in an efficient manner.

Abstract: Disclosed is a method for estimating an available bandwidth of a network link by transmitting small-sized probing packets using a time stamp function of an Internet control message protocol (ICMP) and using time information of the probing packet returned. According to the invention, even when the separate program or function is not activated in the router, it is possible to easily estimate and monitor the available bandwidth of the exterior network link connected to the network being managed. Accordingly, it is possible to operate the network more stably and to detect the abnormal sign of the network at early stage, thereby quickly coping with it. In addition, it is possible to prevent the excessive traffic or load from being caused in the network.

Abstract: An integrative analysis system and method of network vulnerability utilizing multiple heterogeneous vulnerability scanners to enhance the accuracy of the network vulnerability analysis are provided. The method comprises a scanning policy setting-up step of setting-up a common scanning policy able to be adapted to the multiple heterogeneous vulnerability scanners and specifying the policy for the respective vulnerability scanners, a vulnerability scanning and result collecting step of performing for the multiple heterogeneous vulnerability scanners to scan, to collect a result thereof, and to store the same in a database and a scanning result integrative analysis step of performing a relevance analysis and an integrative analysis on the scanning results collected, thereby obtaining a complementary vulnerability scanning utilizing multiple heterogeneous vulnerability scanners, enhancing the accuracy and the comprehension of the scanning results, and obtaining a comprehensive vulnerability analysis on a network.