Siemens gigaset SE551 - Manual (Page 163)

161
Glossary
Gigaset SE551 WLAN dsl/cable / deutsch / A31008-M1029-B101-1-19 / glossary.fm / 25.10.2006
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Mbps
Million bits per second
Specification of the transmission speed in a network.
MER
MAC Encapsulated Routing
MRU
Maximum Receive Unit
The MRU defines the maximum user data volume within a data packet.
MTU
Maximum Transmission Unit
The MTU defines the maximum length of a data packet that can carried over the net-
work at a time.
NAT
Network Address Translation
NAT is a method for converting IP addresses (mostly
Private IP addresses ) within a net-
work into one or several Public IP addresses on the Internet . With NAT several network
components in a LAN can share the router's public IP address to connect to the Internet.
The network components of the local network are hidden behind the router's IP address
registered on the Internet. Because of this security function NAT is frequently used as
part of the
Firewall of a network. If you want to make services on a PC in the local net-
work available on the Internet despite NAT, you can configure the Gigaset SE551 WLAN
dsl/cable as a
Virtual server .
Network
A network is a group of devices connected in wired or wireless mode so that they can
share resources such as data and peripherals. A general distinction is made between
local area networks (
LANs ) and wide-area networks ( WANs ).
Network adapter
The network adapter is the hardware device that creates the connection between a net-
work component and a local network. The connection can be wired or wireless. An Eth-
ernet network card is an example of a wired network adapter. The Gigaset PC Card 108
and the Gigaset USB Adapter 108 are examples of wireless network adapters.
A network adapter has a unique address, the
MAC address .
Port
Data is exchanged between two applications in a network across a port.The port
number addresses an application within a network component. The combination of
IP
address /port number uniquely identifies the recipient or sender of a data packet within
a network. Some applications (e.g. Internet services such as HTTP or FTP) work with
fixed port numbers, others are allocated a free port number whenever they need one.