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MAC-address-based port-level security prevents unauthorized stations from accessing the switch . Port security prevents unauthorized access to a switch port by binding specific WWN ( s ) as having access to one or more given switch . Upon switchover , the data plane will continue to forward packets while the control plane alerts its neighbors of the switchover by issuing an NSF graceful restart to " NSF aware " neighbors . An access Layer switches may be required to support both single and dual homed servers . Core and Aggregation Layers using dual Supervisors for improved resilience can take advantage of NSF / SSO to further bolster network availability . We're not even saying that its an inherently bad thing . SAN-OS 2.1 provides support for FAIS-based storage applications , appliance-based storage applications via the SANTap protocol , and network-accelerated serverless backup . The wide range of security features that the Cisco Catalyst 2960 Series offers helps businesses protect important information , keep unauthorized people off the network , guard privacy , and maintain uninterrupted operation . Network-accelerated serverless backup ( NASB ) helps you back up increased amounts of data in shorter backup timeframes by shifting the data movement from multiple backup servers to Cisco MDS 9000 Series multilayer switches . The Cisco MDS 9513 multilayer director provides an open platform that delivers the intelligence and advanced features required to make multilayer intelligent SANs a reality , including hardware-enabled innovations to host or accelerate applications for data migration , data replication , serverless backup , network-hosted volume management and more . Multilevel access security on the switch console and the Web management interface prevents unauthorized users from accessing or altering switch configurations and can be implemented using an internal user database on each switch or a centrally administered TACACS + or RADIUS server . In the switch class of products , hardware redundancy is typically limited to dual power supplies . Consider another scenario where failover occurs to a redundant chassis and now the switch has to relearn all MAC addresses for dual homed hosts . Allows different people to use the same PC and have different capabilities , so that users only get their assigned privileges no matter how they are logged onto the network-preventing unauthorized access . The Cisco MDS 9500 Series of multilayer directors provides an open platform that delivers the intelligence and advanced features required to make multilayer intelligent SANs a reality , including hardware-enabled innovations to host or accelerate applications for data migration , data replication , serverless backup , network-hosted volume management and more . The bad news is that there is enough demographic pressure to destroy opportunities for corporate growth . The use of VLAN 's lends itself to the switch architecture , which along with the firewalls and load balancers is VLAN aware and use VLAN technology to segregate server farms .