Internet Express for Tru64 UNIX Version 6.8 Administration Guide (14233)

Domain Name
System
See DNS.
DoS Denial of Service. Interruptions to internet service caused by a DoS attack.
DoS attack An attack against a Web site, a network, a system, or other service provider intended to disrupt
its ability to provide services to its users. Software that performs a DoS attack (DoS software )
overloads the service provider with requests for service until its capacity to respond to new
service requests is exceeded. Legitimate requests for service cannot access to the service until
the attack is stopped. See also Distributed DoS attack.
DoS software Denial of Service software used by attackers to control and initiate DoS attacks against other
systems and networks, either within your administrative domain, outside it, or over the Internet.
Also called Intrusion software.
Egress filtering Filtering software that prevents IP packets with randomly generated source addresses from
exiting your system or network, when one of your systems has been compromised and when
the system is being used to perpetrate an attack against other systems. See also Ingress filtering.
File Transfer
Protocol
See FTP.
Firewall Hardware and software that lies between two networks, such as an internal network and an
Internet service provider. The firewall protects your network by blocking unwanted users from
gaining access and by disallowing messages to specific recipients outside the network.
FQDN See fully qualified domain name.
FTP File Transfer Protocol. A client/server protocol that lets a user on one computer transfer files
to and from another computer over a TCP/IP network.
fully qualified
domain name
The full name of a system, consisting of its local host name and its domain name. A fully
qualified domain name is usually precise enough to determine an Internet address for any host
on the Internet.
HTTP Hyper Text Transfer Protocol. The protocol that is used between a Web browser and a server
to request a document and transfer its contents. The specification is maintained and developed
by the World Wide Web Consortium. See also HTTPS
HTTPS Ordinary http exchanged over a Secure Sockets Layer (SSL) encrypted session. See also SSL.
IMAP Internet Message Access Protocol. A method of accessing e-mail or bulletin board messages
kept on a (possibly shared) mail server. IMAP permits an e-mail client program to access remote
messages as if they were local.
Ingress filtering Filtering software that removes IP packets with untrusted source addresses before they have
a chance to enter and affect your system or network. See also Egress filtering.
Intrusion
software
See DoS software.
LDAP Lightweight Directory Access Protocol. An Internet standard protocol that runs over TCP/IP
and can be used to provide a standalone directory service or to provide lightweight access to
the X.500 directory.
LDAP entry A collection of attribute and value pairs stored on an LDAP server that describe something of
interest; for example, a person, a company, or a printer. LDAP entries can be organized as a
hierarchical tree of objects. The full set of attributes for an entry in the tree is defined through
object-oriented inheritance of attributes from parent entries.
Lynx Web
Browser
A World Wide Web browser developed at the University of Kansas and used on
cursor-addressable, character-cell terminals or terminal emulators on UNIX or OpenVMS
systems.
Mail Exchange
Record
See MX record.
MIME Multipurpose Internet Mail Extensions. A standard for multipart, multimedia e-mail messages
and World Wide Web hypertext documents on the Internet. MIME provides the ability to
transfer nontextual data such as graphics, audio, and FAX.
276 Glossary