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Glossary
H
Heartbeat message
Host
HTTP
HTTPS
I
IBSS
ICMP
ICV
IE
IEEE
IETF
222
A heartbeat message is a UDP data packet used to monitor a data
connection, polling to see if the connection is still alive.
In general terms, a heartbeat is a signal emitted at regular intervals by
software to demonstrate that it is still alive. In networking, a heartbeat
is the signal emitted by a Level 2 Ethernet transceiver at the end of
every packet to show that the collision-detection circuit is still
connected.
(1) A computer (usually containing data) that is accessed by a user
working on a remote terminal, connected by modems and telephone
lines.
(2) A computer that is connected to a TCP/IP network, including the
Internet. Each host has a unique IP address.
Hypertext Transfer Protocol is the set of rules for transferring files
(text, graphic images, sound, video, and other multimedia files) on the
World Wide Web. A Web browser makes use of HTTP. HTTP is an
application protocol that runs on top of the TCP/IP suite of protocols.
(RFC2616: Hypertext Transfer Protocol -- HTTP/1.1)
Hypertext Transfer Protocol over Secure Socket Layer, or HTTP over
SSL, is a Web protocol that encrypts and decrypts user page requests
as well as the pages that are returned by the Web server. HTTPS uses
Secure Socket Layer (SSL) as a sublayer under its regular HTTP
application layering. (HTTPS uses port 443 instead of HTTP port 80 in
its interactions with the lower layer, TCP/IP.) SSL uses a 40-bit key
size for the RC4 stream encryption algorithm, which is considered an
adequate degree of encryption for commercial exchange.
Independent Basic Service Set. See BSS. An IBSS is the 802.11 term for
an adhoc network. See adhoc network.
Internet Control Message Protocol, an extension to the Internet
Protocol (IP) defined by RFC792. ICMP supports packets containing
error, control, and informational messages. The PING command, for
example, uses ICMP to test an Internet connection.
ICV (Integrity Check Value) is a 4-byte code appended in standard
WEP to the 802.11 message. Enhanced WPA inserts an 8-byte MIC just
before the ICV. (See WPA and MIC)
Internet Explorer.
Institute of Electrical and Electronics Engineers, a technical
professional association, involved in standards activities.
Internet Engineering Task Force, the main standards organization for
the Internet.
Summit WM20 User Guide, Software Release 4.2
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