D-Link AirPremier DWL-2210AP Manual page 172

802.11g wireless adaptive access point

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Glossary

Legacy IEEE 802.11b devices cannot detect the ERP-OFDM signals used by IEEE 802.11g

stations, and this can result in collisions between data frames from IEEE 802.11b and IEEE

802.11g stations.

If there is a mix of 802.11b and 802.11g nodes on the same channel, the IEEE 802.11g stations

detect this via an ERP ﬂag on the access point and enable request to send (RTS) and clear to

send (CTS) protection before sending data.

See also

CSMA/CA

Frame

A Frame consists of a discrete portion of data along with some descriptive meta-information

packaged for transmission on a wireless network. Each frame includes a source and destination

MAC

address, a control ﬁeld with protocol version, frame type, frame sequence number, frame

body (with the actual information to be transmitted) and frame check sequence for error detection.

A Frame is similar in concept to a Packet, the difference being that a packet operates on the

Network layer (layer 3 in the OSI model) whereas a frame operates on the Data-Link layer (layer

2 in the OSI model).

Gateway

A gateway is a network node that serves as an entrance to another network. A gateway also often

provides a proxy server and a ﬁrewall. It is associated with both a router, which use headers and

forwarding tables to determine where packets are sent, and a switch or bridge, which provides

the actual path for the packet in and out of the gateway.

Before a host on a

gateway.

HTML

The Hypertext Markup Language (HTML) deﬁnes the structure of a document on the World Wide

Web. It uses tags and attributes to hint about a layout for the document.

An HTML document starts with an <html> tag and ends with a </html> tag. A properly

formatted document also contains a <head> ... </head> section, which contains the metadata

to deﬁne the document, and a <body> ... </body> section, which contains its content. Its

markup is derived from the Standard Generalized Markup Language (SGML), which is deﬁned

ISO

8879:1986.

HTML documents are sent from server to browser via HTTP. Also see XML.

HTTP

The Hypertext Transfer Protocol (HTTP) deﬁnes how messages are formatted and transmitted

on the World Wide Web. An HTTP message consists of a

POST, etc.), a request followed by a response.

IAPP

The Inter Access Point Protocol (IAPP) is an

between the access points in a "distribution system". This includes the exchange of information

about mobile stations and the maintenance of bridge forwarding tables, plus securing the

communications between access points.

protocol.

LAN

can access the Internet, it needs to know the address of its default

URL

IEEE

standard (802.11f) that deﬁnes communication

172

and a command (GET, HEAD,

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D-Link AirPremier DWL-2210AP Manual page 172

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