H3C Technologies H3C Intelligent Management Center - Manual (Page 745)

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36 Acronyms and terms
AC—Access controller, which controls and manages all fit APs in a WLAN.
AC group—A group of two or more ACs, in which one or more ACs are operating in primary state to
provide services, and other ACs are operating in secondary state. When a primary AC goes down,
the secondary AC becomes primary to provide services.
AC port index—Index of the port that connects an AC to a fit AP.
AC topology—Displays logical connections between ACs and fit APs managed by the ACs, and
information about the clients connected to the fit APs.
Admin status—Specifies whether a device is managed by IMC: Managed or Unmanaged.
AES—Advanced Encryption Standard, which is a symmetric 128-bit block data encryption
technique.AKM type—Password management type defined for clients in 802.11i. AKM types are none,
PSK, or 802.1X.
A-MPDU—Aggregated MAC Protocol Data Unit, which combines multiple MPDUs and has only one
PHY header.
A-MSDU—Aggregated MAC Service Data Unit, which combines multiple MSDUs and has only one
PHY header.
Antenna gain—A measure of the antenna's ability to direct or focus radio energy over a region of
space.
AP—Access point, which bridges the wireless link on one side to the wired network on the other.
AP access port—A port that connects an access device to an AP, directly or indirectly.
Area access control policy—Permits or denies concerned user group's access to an area.
Association—An association is established between an AP and a client over an AP link through a
wireless network with the SSID specified by the AP.
Association congestion rate—Ratio of the number of association failures due to insufficient resources
to the total number of association requests.
Attack list—A blacklist configured on an AC that lists devices where ACs can perform attacks.
Authentication mode—MSM series ACs and fat APs use the authentication mode configured for the
WLAN. Authentication modes include none, HTML authentication, 802.1X authentication, and MAC
authentication. Comware-based ACs and fat APs use the link authentication mode configured in the
service policy, which can be Open-System, Shared-Key, or all.
Authorization mode—Defined for clients in 802.11, the authorization modes are Open-System and
Shared-Key. In Open-System mode, clients pass authentication directly when they have wireless access
requests. In Shared-Key mode, clients must use the same shared key as the device that provides
wireless access does.
Basic performance monitoring—WSM monitors basic performance indexes of wireless devices based
on the performance management feature of the IMC Platform. The performance management feature
monitors CPU, memory, and other performance indexes of wireless devices in real time, and displays
the monitoring data in graphs.