When configuration is done, both test tools start to scan the set network. After a period of time, each of them will report number of found active hosts. From experimental results, it shows that Net Clarity has slightly better performance in searching active host. However, it is much slower than Nessus. Both factors impact on performance of vulnerability test tools. Nevertheless, we desired to take an effect form number of found active host merely. This paper will concentrate to evaluate risk form number of found vulnerabilities on active hosts rather than performance of time response to detected attacks. The basis assumption is that detected vulnerabilities are not attacked yet. Time consumption from host searching will play its role in the next future work.