G–7
the main protocols in TCP/IP networks.
Whereas the IP protocol deals only with packets,
TCP enables two hosts to establish a connection
and exchange streams of data. TCP guarantees
delivery of data and guarantees packet delivery
in the same order in which the originating
machine sends them.
Traps
Notifications sent by managed devices to the
NMS when certain events occur, such as a shut-
down or authentication error.
UDP
Short for User Datagram Protocol. A connection-
less protocol that, like TCP, runs on top of IP net-
works. Unlike TCP/IP, UDP/IP provides very few
error recovery services, offering instead a direct
way to send and receive datagrams over an IP
network. Its primary use is for broadcasting mes-
sages over a network.
Virus pattern file
Trend Micro Network Virus Pattern (NVP). The
antivirus component that provides rules and sig-
natures to detect network threats and other vul-
nerabilities. Network VirusWall Enforcer 2500
uses both the Network Virus Scan Engine and
Network Virus Pattern to detect known threats.
VLAN
Short for virtual LAN. A network consisting of cli-
ents that are not on the same segment of a
Local Area Network (LAN) but behave as if they
are.
VPN
Short for virtual private network, a network that
makes use of public wires to connect nodes. For
example, there are a number of systems that
enable you to create networks using the Internet
as the medium for transporting data. These sys-
tems use encryption and other security mecha-
nism to ensure only authorized users can
access the network and unauthorized users can-
not intercept information.
VxD
Refers to scan engine used by Trend Micro
products running on Windows 95, 98, or ME
machines.
Worms
A self-contained program (or set of programs)
that is able to spread functional copies of itself or
its segments to other computer systems, often
via email.
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