Glossary - IDS uEye series User Manual

User Manual uEye Cameras V3.32
5.2

Glossary

UDP
UDP stands for User Datagram Protocol and contains mechanisms that allow applications to easily
send messages to each other. UDP is session-oriented and has no protective measures to guard
against message loss or duplication. The header contains the sender port, the recipient port, the
length of the datagram and a checksum.
Port
Ports are address components used in network protocols to assign data segments to the correct
services (protocols).
Firewall
A firewall is a software or hardware shield that protects a local network or a computer from Internet-
based attacks.
Among a firewall's main uses are protection from hacker attacks, computer viruses, trojans, worms
and spyware.
ARP
The Address Resolution Protocol uses network messages, called broadcasts, to determine on which
logical segment of the network the recipient of a packet is located.
The responses to the broadcast contain all the IP addresses of the available subnet and the
associated MAC addresses. Every IP address is stored in an ARP table together with the
associated MAC address. These tables are necessary because the two addresses are independent
of each other and therefore cannot be calculated by means of an algorithm.
Subnet
Subnets are small units of a network. Using subnets makes it easier to manage networks and
increases performance, as connecting devices such as routers or switches can be used to limit data
traffic to specific subnets.
The address is made up of the IP address of the network, the subnet address and the host address.
Switch
The term switch refers to the connecting units in a LAN (Local A rea Network ). They are used to
connect subnets of the same topology. Contrary to hubs, switches dispatch incoming data packets
only to the specific recipients.
Router
Routers are connection units that connect different networks or LANs.
Hub
A hub is a coupling unit that connects several network units on one line (star topology). Contrary to a
switch, the message of a network member is dispatched to all other network members.
DHCP
The Dynamic Host Configuration Protocol controls the dynamic configuration of IP addresses.
When a workstation which is configured for the use of DHCP is started up on a LAN, it registers with
a server running this service. The server then assigns an available IP address, which is stored locally
so that reassignment is not necessarily required on the next start-up.
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