Juniper NETWORK AND SECURITY MANAGER 2010.3, Administration Manual

Page: 879 / 1016

DHCP (Dynamic Host
Configuration
Protocol)
DHCP is used to dynamically assign IP addresses to networked computers.
Directive A directive is a command sent by NSM to your managed devices. Directives include importing,
updating, rebooting, and so on. When you send a command to a device or group of devices,
NSM creates a job for that command and displays information about that job in the Job
Manager.
Distributed Denial of
Service (DDoS) Attack
A DoS attack (typically a flood) from multiple source points. A DDoS attacks is more effective
than a DoS attack, as it is no longer one computer against one server in an effort to overwhelm
the server.
DM (Data Model) A Data Model is an XML file that contains configuration data for an individual device. The DM
is stored in the Device Server; when you create, update, or import a device, the GUI Server edits
the Abstract Data Model (ADM) to reflect the changes, then translates that information to
the DM.
DMI Device Management Interface—A common, secure management interface used by all device
families added to NSM in release 2008.1 and later releases. DMI is based on a common protocol
and device-specific schemas for configuration, inventory management, logging, and status
monitoring. DMI schemas can be updated without the need to upgrade NSM.
DNS The Domain Name System maps domain names to IP addresses.
Domain A domain is a logical grouping of devices, their policies, and their access privileges. A domain
can contain devices, templates, objects, policies, VPNs, administrators, activities, authentication
servers, groups—a representation of the all or a subset of the physical devices and functionality
on your network. The domain above a domain is the parent domain, and the domain below a
domain is the child domain. Domains at the same level are considered peer domains.
Domain Menu The Domain Menu is the pull-down menu above the navigation tree where domains and
subdomains are selected.
Dynamic Routing A routing method which adjusts to changing network circumstances by analyzing incoming
routing update messages. If the message indicates that a network change has occurred, the
routing software recalculates routes and sends out new routing update messages. These
messages populate the network, directing routers to rerun their algorithms and change their
routing tables accordingly. There are two common forms of dynamic routing, including Distance
Vector Routing and Link State Routing.
829 Copyright © 2010, Juniper Networks, Inc.
Appendix A: Glossary