USRobotics Instant802 APSDK - Manual (Page 310)

Professional Access Point
Administrator Guide
Glossary - 310
F
Frame
A Frame consists of a discrete portion of data along with 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).
G
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 LAN can access the Internet, it needs to know the address of its default gateway.
H
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 tag and ends with a tag. A properly formatted
document also contains a ... section, which contains the metadata to define the document,
and a ... section, which contains its content. Its markup is derived from the Standard
Generalized Markup Language (SGML), which is defined in 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 URL and a command (GET, HEAD, POST, etc.), a request
followed by a response.
I
IAPP
The Inter Access Point Protocol (IAPP) is an IEEE standard ( 802.11f ) that defines communication 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.