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A VLAN access control list (VACL) provides access control for all packets that are bridged within a VLAN or that are routed into or out of a VLAN. Unlike regular Cisco IOS access control lists that are configured on router interfaces and applied on routed packets only, VACLs apply to all packets.
In computer security, an access-control list (ACL) is a list of permissions [a] associated with a system resource (object or facility). An ACL specifies which users or system processes are granted access to resources, as well as what operations are allowed on given resources. [1] Each entry in a typical ACL specifies a subject and an operation.
TCP/IP, for example. RFC 793 ACL: Access control list Security, application layer Access control list, Cisco overview: ADSL: Asymmetric digital subscriber line Telecom ITU-T G.992.5 Annex M, for example AES: Advanced Encryption Standard Security U.S. FIPS PUB 197: ANSI: American National Standards Institute Organization ANSI: API: Application ...
NX-OS does not distinguish between standard or extended access lists, all lists are named and "extended" in functionality. [4] NX-OS did not support scp server prior to 5.1(1) release. In NX-OS, there is no "write" command to save the configuration like on IOS (one uses the "copy" command, instead).
Extended TACACS (XTACACS) is a proprietary extension to TACACS introduced by Cisco Systems in 1990 without backwards compatibility to the original protocol. TACACS and XTACACS both allow a remote access server to communicate with an authentication server in order to determine if the user has access to the network.
For example, if some host needs a password verification for access and if credentials are provided then for that session password verification does not happen again. This layer can assist in synchronization, dialog control and critical operation management (e.g., an online bank transaction).
Layer-4 information can also be used to help make routing decisions. For example, extended access lists can filter packets based on layer-4 port numbers. Another example is accounting information gathered by open standards using sFlow. A layer-4 switch can use information in the transport-layer protocols to make forwarding decisions.
An example of a service set called "WiFi Wikipedia" consisting of two basic service sets (BSSs). Notebook_My is able to automatically roam between the two BSSs, without the user having to explicitly connect to the second network. Note that in the diagram the incorrect label ESSID (Extended Service Set Identifier) refers to the service set ...