Siemens HiPath 8000 Administrator's Manual page 158

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Glossary
Subnet Mask
To discern the network part from the host part of an ->IP address, a device performs an
AND operation on the IP address and the network mask. The network classes A, B, and C
each have a subnet mask that demasks the relevant bits: 255.0.0.0 for Class A,
255.255.0.0 for Class B and 255.255.255.0 for Class C. In a Class C network, for instance,
254 IP addresses are available.
Switch
Network device that connects multiple network segments and terminal devices. The for-
warding of data packets is based on ->MAC Addresses: data targeted to a specific device
is directed to the switch port that device is attached to.
T
TCP
Transfer Control Protocol. The protocol belongs to the transport layer and establishes a
connection between two entities on the application layer. It guarantees reliable and in-order
delivery of data from sender to receiver, as opposed to ->UDP.
TLS
Transport Layer Security. Ensures privacy between communicating applications. Typically,
the server is authenticated, but mutual authentication is also possible.
U
UDP
User Datagram Protocol. A minimal message-oriented transport layer protocol used espe-
cially in streaming media applications such as ->VoIP. Reliability and order of packet deliv-
ery are not guaranteed, as opposed to ->TCP, but ->UDP is faster and more efficient.
URI
Uniform Resource Identifier. A compact string of characters used to identify or name a re-
source.
URL
Uniform Resource Locator. A special type of ->URI which provides means of acting upon
or obtaining a representation of the resource by describing its primary access mechanism
or network location.
V
VLAN
Virtual Local Area Network. A method of creating several independent logical networks
within a physical network. For example, an existing network can be separated into a data
and a voice VLAN.
X-6
HiPath 2000, HiPath 3000/5000, HiPath 4000 - OpenStage 60/80, Administrator Manual
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A31003-01010-M11-1-7619, 29/01/2007