Microsoft Internet Security and
Acceleration Server 2000
D
data filter
An application
filter that monitors content, as in a check for viruses, and
that can also modify content.
data packet
A sequence of binary digits, including data and control
signals, that is transmitted and switched as a composite whole. The
data, control signals, and, possibly, error control information are
arranged in a specific format.
Data Source
Name (DSN)
The logical name that allows a connection to an ODBC data
source, such as a SQL Server database.
demand-dial
connectivity
A process used by Autodial to perform on-demand dialout
connections either to an Internet service provider or to a
corporate office from a branch office.
The component that relays DHCP and
BOOTP broadcast
messages between a DHCP server and a client across an IP
router.
dial-up
networking
A component of Windows 2000 and Windows 95/98 that enables
users to connect to remote networks, such as the Internet or an
internal network, over a telephone line.
discretionary
access-control list (DACL)
A list that is controlled by the owner of an object and that
specifies the access that particular users or groups can have to
the object.
distributed
caching
The caching of Internet objects in an array or chain of ISA
computers, providing load balancing and fault tolerance. Client
requests are sent through the array, to upstream ISA
computers, or any combination thereof.
The practice of assuming the DNS name of another system either
by corrupting a name-service cache or by compromising a domain-name
server for a valid domain.
domain filtering
Controlling access to specific Internet sites by denying or
granting permission based on the Internet computer's domain name or
friendly name.
domain name
The computer name that substitutes for a network IP address.
For example, www.microsoft.com instead of the IP address
157.45.60.81. Also called the friendly name. See also Domain Name System
(DNS).
Domain Name
System (DNS)
A protocol and computer-naming hierarchy used throughout the
Internet to map computer IP addresses to their domain names. DNS is
sometimes referred to as the BIND service.
downstream/upstream
routing
The routing of a response from one ISA computer to another ISA
computer. Client computers connecting to an ISA computer are always
downstream. A request from a client computer always flows upstream
to ISA computers until the requested item is found, whether it is
in the cache of an ISA computer or from the Internet. ISA sends the
response downstream to the client computer.
driver
A software component that allows a computer to send and receive
information to and from a hardware device.
Having connections to two separate physical networks. Each ISA
computer in an array has both an internal and external network
adapter for Internet connectivity. The internal adapter connects to
the internal network. The external adapter connects to the
Internet.
dynamic
addressing
The automatic assignment of IP addresses in a changing
network.
dynamic filters
Dynamic filters are automatically started by the Firewall
service, Web proxy, or SOCKS proxy service. This feature allows the
ISA services to automatically open and close communication ports on
the external interface when transmission of packets is needed.
Dynamic
Host Configuration Protocol (DHCP)
A protocol that offers dynamic assignment of IP addresses and
related information for temporarily connected network users. DHCP
provides safe, reliable, and simple TCP/IP network configuration,
prevents address conflicts, and helps conserve the use of IP
addresses through centralized management of address
allocation.