IDS Software Suite 4.96.1
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.
A broadcast is a data packet that is transmitted to all stations on a network. This is done by sending a data packet to the reserved IP address, the so-called broadcast address. At the broadcast address of a subnet all bits of the host address are set to 1 (see above subnet).
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.
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.
Network devices send a heartbeat to signal that they are operational and fully functional. If this heartbeat signal is not detected, the recipient system assumes that the remote device is no longer available.
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.
Multicast
In contrast to broadcast, at multicast a data packet is transmitted to a specific group of participants on a network. The recipients must register at the transmitter to receive the data.
Paired describes the logical connection of a network camera and a host PC. When a camera and a host PC are paired, they are exclusively connected. Simultaneous pairing with several host PCs is not possible.
A request for image data is only possible in paired state. Exceptions are virtual multicast cameras.
Port
Ports are address components used in network protocols to assign data segments to the correct services (protocols).
Router
Routers are connection units that connect different networks or LANs.
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 Area Network). They are used to connect subnets of the same topology. Contrary to hubs, switches dispatch incoming data packets only to the specific recipients.
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.
