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Traditionally , SANs have been considered " secure " primarily because SAN deployments have been limited to a subset of a single data center-in essence , an isolated network . The shortages will manifest themselves differently by region . These QoS features allow network administrators to prioritize mission-critical and bandwidth-intensive traffic , such as enterprise resource planning ( ERP ) , voice ( IP telephony traffic ) , and computer-aided design and manufacturing ( CAD / CAM ) , over applications such as FTP or e-mail . Exult and the other outsourcers were able to secure their niches as a component of the broader economic cost cutting . While each Cisco MDS 9000 Family management feature or service can easily be categorized according to the definitions above , Cisco provides tools for a subset of the categories mentioned above . Interestingly , this finding provokes yet another definition of a passive vs. an active job hunter .