Symantec 10744983 - Mail Security 8320, Руководство администратора

Страница: 231 / 249

Control Center
A Web-based configuration and administration center. Each site has one Control
Center. The Control Center also houses Spam Quarantine and supporting software.
You can configure and monitor all of your Scanners from the Control Center.
defer
An action that an MTA receiving an email message can take, which consists of
using a 4xx SMTP response code to tell the sending MTA to try again later.
dialog box
A secondary window containing command buttons and options available to users
for carrying out a particular command or task.
dictionary
A list of words and phrases against which email messages can be checked for
non-compliant content. Symantec Mail Security allows you to create Content
Compliance filters that screen email against a specific dictionary. You can use the
provided dictionaries, add terms to the provided dictionaries, or add additional
dictionaries.
directory harvest attack
A high volume email campaign addressed to dictionary-generated recipient
addresses on a specific domain. Directory harvest attacks (DHAs) not only consume
resources on the targeted email server, they also provide the spammers with a
valuable list of valid email addresses (targets for future spam campaigns).
Symantec Mail Security allows you to identify and defuse directory harvest attacks.
DMZ (de-militarized
zone)
A network added between a protected network and an external network to provide
an additional layer of security. Sometimes called a perimeter network.
DNS (Domain Name
Server) proxy
An intermediary between a workstation user and the Internet that allows the
enterprise to ensure security and administrative control.
DNS (Domain Name
System)
A hierarchical system of host naming that groups TCP/IP hosts into categories.
For example, in the Internet naming scheme, names with .com extensions identify
hosts in commercial businesses.
DNS server
A repository of addressing information for specific Internet hosts. Name servers
use the Domain Name System (DNS) to map IP addresses to Internet hosts.
domain
1. A group of computers or devices that share a common directory database and
are administered as a unit. On the Internet, domains organize network addresses
into hierarchical subsets. For example, the .com domain identifies host systems
that are used for commercial business. 2. A group of computers sharing the
network portion of their host names, for example, raptor.com or miscrosoft.com.
Domains are registered within the Internet community. Registered domain entities
end with an extension such as .com, .edu, or .gov or a country code such as .jp
(Japan).
downstream
At a later point in the flow of email. A downstream email server is an email server
that receives messages at a later point in time than other servers. In a
multiple-server system, inbound mail travels a path from upstream mail servers
to downstream mail servers. Downstream can also refer to other types of
networking paths or technologies.
231 Glossary