Siemens EF 711 Series Betriebsanweisung PDF herunterladen (Seite 474)

Glossary

SCALANCE WLC711

A-4 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

EAP-TLS

EAP-TTLS

EAP-TLS Extensible Authentication Protocol - Transport Layer Security. A general protocol

for authentication that also supports multiple authentication methods, such as token cards,

Kerberos, one-time passwords, certificates, public key authentication and smart cards. IEEE

802.1x specifies how EAP should be encapsulated in LAN frames.

In wireless communications using EAP, a user requests connection to a WLAN through an

access point, which then requests the identity of the user and transmits that identity to an

authentication server such as RADIUS. The server asks the access point for proof of

identity, which the access point gets from the user and then sends back to the server to

complete the authentication.

EAP-TLS provides for certificate-based and mutual authentication of the client and the

network. It relies on client-side and server-side certificates to perform authentication and can

be used to dynamically generate user-based and session-based WEP keys.

EAP-TTLS (Tunneled Transport Layer Security) is an extension of EAP-TLS to provide

certificate-based, mutual authentication of the client and network through an encrypted

tunnel, as well as to generate dynamic, per-user, per-session WEP keys. Unlike EAP-TLS,

EAP-TTLS requires only server-side certificates.

(See also PEAP)

Encapsulation See tunnelling.

ESS Extended Service Set (ESS). Several Basic Service Sets (BSSs) can be joined together to

form one logical WLAN segment, referred to as an extended service set (ESS). The SSID is

used to identify the ESS. (See BSS and SSID.)

FHSS Frequency-Hopping Spread Spectrum. A transmission technology used in Local Area

Wireless Network (LAWN) transmissions where the data signal is modulated with a

narrowband carrier signal that ‘hops’ in a random but predictable sequence from frequency

to frequency as a function of time over a wide band of frequencies. This technique reduces

interference. If synchronized properly, a single logical channel is maintained. (Compare

DSSS)

Fit, thin and fat APs A thin AP architecture uses two components: an access point that is essentially a stripped-

down radio and a centralized management controller that handles the other WLAN system

functions. Wired network switches are also required.

A fit AP, a variation of the thin AP, handles the RF and encryption, while the central

management controller, aware of the wireless users' identities and locations, handles secure

roaming, quality of service, and user authentication. The central management controller also

handles AP configuration and management.

A fat (or thick) AP architecture concentrates all the WLAN intelligence in the access point.

The AP handles the radio frequency (RF) communication, as well as authenticating users,

encrypting communications, secure roaming, WLAN management, and in some cases,

network routing.

FQDN Fully Qualified Domain Name. A ‘friendly’ designation of a computer, of the general form

computer.[subnetwork.].organization.domain. The FQDN names must be translated into an

IP address in order for the resource to be found on a network, usually performed by a

Domain Name Server.

FTM Forwarding Table Manager

FTP File Transfer Protocol

Gateway In the wireless world, an access point with additional software capabilities such as providing

NAT and DHCP. Gateways may also provide VPN support, roaming, firewalls, various levels

of security, etc.

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

1 2 ... 469 470 471 472 473 474 475 476 477 478 479 ... 491 492

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