Bedienungsanleitung Grundig Cosmopolit 7 A WEB (Seite 45 von 53) (Englisch)

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INFORMATION

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Proxy server

A proxy or proxy server is a service program for

computer networks that administers data trans-

fer. It makes data transfer faster, and can also

increase security by implementing access control

mechanisms.

The transfer is conducted between computers or

programs in computer networks. On the server

side, the proxy acts as a client; on the client side,

it acts as a server.

Router

A router is a network component that links sev-

eral computer networks.

The router analyses (on the basis of layer 3 in-

formation) the network packages of a protocol it

receives and forwards it to the intended destina-

tion network.

Conventional routers work on layer 3 of the

application layer. A router has an interface for

every network connected to it. When data is re-

ceived, the router determines the correct path to

the destination and thereby the suitable interface

via which the data can be transferred. For this it

uses a locally available routing table that speci-

ﬁes via which router connection a particular net-

work can be reached.

Security (WEP/WPA)

WEP (wired equivalent privacy) is the standard

encryption algorithm for WLAN. It controls both

access to the network as well as ensuring the

conﬁdentiality and integrity of data. This proce-

dure is considered insecure nowadays.

For this reason, more recent WLAN installations

should use the more secure WPA encryption.

V-Tuner

Service provider that provides Internet radio sta-

tions.

Wi-Fi

The Wi-Fi Alliance is an organisation that has

taken on the task of certifying products from dif-

ferent manufacturers on the basis of the IEEE-

802.11 standard, thereby ensuring that diﬀerent

wireless devices can operate in parallel.

On 31 October 2002, the consortium an-

nounced a new encryption technology – Wi-Fi

Protected Access (WPA) – a part of the (then)

forthcoming IEEE standard 802.11i which

would replace the WEP encryption procedure,

which was already regarded as insecure before

the new standard came into force. After 802.11i

came into force, the Wi-Fi group coined the term

WPA2.

IEEE 802.11e is an industrial standard issued

by the Institute of Electrical and Electronics En-

gineers (IEEE) and a supplement to the wireless

LAN standard IEEE 802.11 for supporting the

quality of service.

802.11e works according to a similar principle

as the QoS procedure DiﬀServ. Data packages

in the WLAN are marked by the sender and the

access point is stopped in order to handle pack-

ages with higher priority.

With the aid of 802.11e, real-time application

such as Voice over IP are better supported as

they require a certain bandwidth in the network

to ensure the connection is not interrupted if

other network traﬃc creates too great a burden

on the available data transfer rate.

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