Microsoft Internet Security and
Acceleration Server 2000
H
H.323 Protocol
The International Telecommunications Union - Telecommunications
(ITU-T) standard protocol for real-time multimedia communications
and conferencing over packet-based networks.
hash
A mathematical algorithm used for routing client requests
within an array or a chain. The result of the hash determines which
specific ISA computer to send the client request.
header
In data packet communications, a specified number of bytes that
precedes the actual data being transmitted. It identifies control
information used to deliver, route, and process the data contents
of a packet.
hierarchical
caching
The forwarding of a client HTTP request from one ISA computer
to another ISA computer upstream. The downstream (source) ISA
computer forwards client requests that it cannot service from its
own cache. Hierarchical caching uses upstream routing and is a
subset of distributed
caching.
hierarchical
chaining
Linking multiple ISA computers together to form a chain.
Individual ISA computers, arrays, or any combination can be
chained.
hit rate
The percentage of client requests fulfilled through previously
cached data, in contrast to the total of all client requests that
have been processed by the caching service.
The name given to a computer that is part of a
Windows 2000 network domain and used for client
authentication. Also called the computer name. See also fully
qualified domain name (FQDN).
Hypertext Markup Language (HTML). A markup language derived
from the Standard Generalized Markup Language (SGML). Used to
create a text document with formatting specifications that tells a
software browser how to display the page or pages included in the
document.
HTTP
The client/server protocol used to access information on the
Web.
HTTP
Redirector filter
A Hypertext Transfer Protocol (HTTP) redirector filter provided
with ISA, that forwards HTTP requests from Firewall and secure
network address translation (SecureNAT) clients to the Web proxy
service.