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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
<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 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.