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Glossary
S
Server
Provides a service to other
scribers (Clients). The term can indicate a
computer/PC or an application. A server is
addressed via
IP address/Domain name
Port.
Static IP address
See
Fixed IP
address.
Subnet
Segment of a Network.
Subnet mask
IP
addresses consist of a fixed line number
and a variable subscriber number. The net-
work number is identical for all
subscribers. The size of the network number
part is determined in the subnet mask. In the
subnet mask 255.255.255.0, for example, the
first three parts of the IP address are the net-
work number and the last part is the sub-
scriber number.
Symmetric NAT
A symmetric NAT assigns different external
IP addresses and port numbers to the same
internal IP addresses and port numbers –
depending on the external target address.
T
TCP
Transmission Control Protocol
Transport
protocol. Session-based trans-
mission protocol: it sets up, monitors and
terminates a connection between sender
and recipient for transporting data.
TLS
Transport Layer Security
Protocol for encrypting data transmissions
on the Internet. TLS is a superordinated
Transport
protocol.
Transmission rate
Speed at which data is transmitted in the
WAN
or LAN. The transmission rate is meas-
ured in data units per unit of time (Mbit/s).
124
Network sub-
and
Network
Transport protocol
Controls data transport between two com-
munication partners (applications).
See also: UDP, TCP, TLS.
U
UDP
User Datagram Protocol
Transport
protocol. Unlike TCP,
non session-based protocol. UDP does not
establish a fixed connection. The data pack-
ets ("datagrams") are sent as a broadcast.
The recipient is solely responsible for mak-
ing sure the data is received. The sender is
not notified about whether it is received or
not.
URL
Universal Resource Locator
Globally unique address of a domain on the
Internet.
URLs identify a resource by its location on
the Internet. For historical reasons the term
is often used as a synonym for URI.
User name
User ID
Name/number combination for access e.g.,
to your private address directory on the
Internet.
V
Voice codec
See Codec.
W
WAN
Wide Area Network
Wide-area network that is unrestricted in
terms of area (e.g., Internet).
UDP
is a
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