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KBX5000 efficiently maintains a snapshot history to allow convenient rollback to any point-in-time , enabling a quick and effective recovery from any disaster . Authentication refers to the authentication of users to access a specific device . One item of interest that was not intuitively obvious was the fact that initial tests were under-running the bandwidth capacity of the OC-3 . In addition , for authentication of users with a TACACS + or a RADIUS server , 802.1x provides port-level security . For authentication of users with a Terminal Access Controller Access Control System ( TACACS + ) or RADIUS server , 802.1x provides port-level security . Other technologies discussed in the next section , will also play a critical role in the successful implementation of the server cluster design . The Cisco Catalyst 3750 Series supports a comprehensive set of security features for connectivity and access control , including ACLs , authentication , port-level security , and identity-based network services with 802.1x and extensions . These types of scenarios are described in the next section , along with recommendations .