Kerio Tech Firewall6 - Manual (Page 392)

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Glossary of terms
ActiveX
This Microsoft’s proprietary technology is used for creation of dynamic objects for web
pages. This technology provides many features, such as writing to disk or execution of
commands at the client (i.e. on the host where the Web page is opened). This technology
provides a wide range of features, such as saving to disk and running commands at the
client (i.e. at the computer where the Web page is opened). Using ActiveX, virus and
worms can for example modify telephone number of the dial-up.
ActiveX is supported only by Internet Explorer in Microsoft Windows operating systems.
Cluster
A group of two or more workstations representing one virtual host (server). Requests
to the virtual server are distributed among individual hosts in the cluster, in accordance
with a defined algorithm. Clusters empower performance and increase reliability (in case
of dropout of one computer in the cluster, the virtual server keeps running).
Connections
A virtual bidirectional communication channel between two hosts.
See also TCP
DDNS
DDNS (Dynamic Domain Name System) is DNS with the feature of automatic update of
records.
Default gateway
A network device or a host where so called default path is located (the path to the Inter-
net). To the address of the default gateway such packets are sent that include destination
addresses which do not belong to any network connected directly to the host and to any
network which is recorded in the system routing table.
In the system routing table, the default gateway is shown as a path to the destination
network 0.0.0.0 with the subnet mask 0.0.0.0.
Note: Although in Windows the default gateway is configured in settings of the network
interface, it is used for the entire operating system.
DHCP
DHCP (Dynamic Host Configuration Protocol) Serves automatic IP configuration of com-
puters in the network. IP addresses are assigned from a scope. Besides IP addresses,
other parameters can be associated with client hosts, such as the default gateway ad-
dress, DNS server address, local domain name, etc.