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Page 106 / 121 Scroll up to view Page 101 - 105
104
Glossary
DNS
Domain Name System
DNS permits the assignment of IP addresses to computers or
Domain names
, which are
easier to remember. A DNS server must administer this information for each
LAN
with
an
Internet
connection. As soon as a page on the Internet is called up, the browser
obtains the corresponding IP address from the DNS server so that it can establish the
connection.
On the Internet. the assignment of domain names to IP addresses is based on a hierar-
chical system. A local PC only knows the address of the local name server. This in turn
knows all the addresses of the PCs in the local network and the next higher name serv-
ers, which again know addresses and the next higher name servers.
DNS server
See
DNS
Domain name
The domain name is the reference to one or more Web servers on the
Internet
, e.g.
siemens.com. The domain name is mapped to the respective
IP address
via the
DNS
service.
DSL
Digital Subscriber Line
DSL is a data transmission technology in which a connection to the
Internet
can be run
over normal telephone lines. A DSL connection is supplied by an
Internet Provider
. It
requires a DSL modem.
Dynamic IP address
A dynamic
IP address
is assigned to a network component automatically by
DHCP
. This
means that the IP address of a network component can change with every login or at
certain intervals.
See also
Static IP address
DTIM
Delivery Traffic Indication Message
A DTIM is a signal that is sent by an access point as part of a
Beacon
to a client device in
power-saving mode to indicate that a data packet is ready for delivery. The DTIM interval
defines the frequency with which a DTIM appears in a series of beacon packets.
Page 107 / 121
105
Glossary
DynDNS
Dynamic DNS
The assignment of
Domain names
and
IP addresses
is handled by the Domain Name
Service (
DNS
). This service is now enhanced with so-called Dynamic DNS (DynDNS) for
Dynamic IP addresses
. This enables the use of a network component with a dynamic
IP address as a
Server
on the Internet. DynDNS ensures that a service can always be
addressed on the
Internet
under the same domain name regardless of the current
IP address.
Encryption
Encryption protects confidential information against unauthorised access. With an
encryption system, data packets can be sent securely over a network. The Gigaset
SE361 WLAN offers
WEP
encryption and
WPA
encryption for secure data transmission
over wireless networks.
Ethernet
Ethernet is a network technology for local networks (
LANs
) defined by the
IEEE
as stand-
ard IEEE 802.3. Ethernet uses a baseband cable with a data transmission rate of 10, 100,
or 1000
Mbps
.
Exposed Host
Exposed Host refers to a PC outside the firewall.
See also
DMZ
Firewall
Firewalls are used by network operators as protection against unauthorised external
access. This involves a whole bundle of hardware and software actions and technologies
that monitor and control the data flow between the private network to be protected and
an unprotected network such as the
Internet
.
See also
NAT
Flat rate
A flat rate is a special billing system for
Internet
connections. The
Internet Provider
charges a monthly fee regardless of the duration and number of logins.
Full duplex
Data transmission mode in which data can be sent and received simultaneously.
See also
Half duplex
Gateway
A gateway is a device used to connect networks with completely different architectures
(addressing, protocols, application interfaces, etc.). Although it is not totally correct, the
term is also used as a synonym for
Router
.
See also Bridge, Hub, Router, Switch
Page 108 / 121
106
Glossary
Global IP address
See
Public IP address
Half duplex
Operating mode for data transfer. Only one party can receive or send data at any one
time.
See also
Full duplex
HTTP proxy
An HTTP proxy is a
Server
that network components use for their
Internet
traffic. All
requests are sent via the proxy.
Hub
A hub connects several network components in a star-topology network by sending all
the data it receives from one network component to all the other network components.
See also
Switch
,
Bridge
,
Router
,
Gateway
IEEE
Institute of Electrical and Electronics Engineers
IEEE is an international body that defines network standards, especially to standardise
LAN
technologies, transfer protocols, data transfer speeds and wiring.
IEEE 802.11
IEEE
802.11 is a standard for wireless LANs operating in the 2.4 GHz and 5 GHz band.
In so-called
Infrastructure mode
terminals can be connected to a base station (
Access
point
) or they can connect with each other spontaneously (
Ad-hoc mode
).
IGMP
Internet Group Management Protocol
IGMP is an Internet
Protocol
that enables an Internet computer to inform neighbouring
routers that it is a member of a multicast group. With multicasting, a computer can send
content on the Internet to several other computers that have registered an interest in
the first computer's content. Multicasting can, for example, be used for multimedia pro-
grams for media streaming to recipients that have set up multicast group membership.
Infrastructure mode
Infrastructure mode is a way of operating wireless local networks (
WLANs
) in which an
Access point
handles the data traffic. Network components cannot establish a direct
connection with each other as is the case in
Ad-hoc mode
.
Page 109 / 121
107
Glossary
Internet
The Internet is a wide-area network (
WAN
) linking several million users around the
world. A number of
Protocols
have been created for exchanging data, and these are
known collectively as
TCP/IP
stack. All participants on the Internet can be identified by
an
IP address
. Servers are addressed by
Domain names
(e.g. siemens.com). Domain
names are assigned to IP addresses by the Domain Name Service (
DNS
).
Among the most important Internet services are:
u
electronic mail (email)
u
the World Wide Web (WWW)
u
file transfer (FTP)
u
discussion forums (Usenet / Newsgroups)
Internet Provider
An Internet provider (Internet Service Provider) offers access to the
Internet
for a fee.
IP
Internet protocol
The IP
Protocol
is one of the
TCP/IP
protocols. It is responsible for addressing parties in a
network using
IP addresses
, and routes data from the sender to the recipient. It decides
the paths along which the data packets travel from the sender to the recipient in a com-
plex network (routing).
IP address
An IP address is a network-wide unique address for a network component in a network
based on the
TCP/IP
protocol (e.g. in a local area network (
LAN
) or on the
Internet
). The
IP address has four parts (values from 0 to 255) separated by periods (e.g. 192.168.1.1).
The IP address consists of the network address and the PC address. Depending on the
Subnet mask
, one part of the IP address (mostly one, two or three parts) form the net-
work address, the remainder the PC address. You can find out the IP address of your PC
by entering
ipconfig
in the command prompt.
IP addresses can be assigned manually (see
Static IP address
) or automatically (see
Dynamic IP address
).
On the Internet
Domain names
are normally used instead of IP addresses.
DNS
is
responsible for assigning domain names to IP addresses.
The Gigaset SE361 WLAN has a
Private IP address
and a
Public IP address
.
IP pool range
The Gigaset SE361 WLAN's IP address pool defines a range of
IP addresses
that the
router's
DHCP server
can use to assign
Dynamic IP addresses
.
ISP
Internet Service Provider, see
Internet Provider
Page 110 / 121
108
Glossary
LAN
Local Area Network
A local area network (or local network) links network components so that they can
exchange data and share resources. The physical range is restricted to a particular area
(a site). As a rule the users and operators are identical. A local network can be connected
to other local networks or a wide area network (
WAN
) such as the
Internet
.
With the Gigaset SE361 WLAN you can set up a wired local
Ethernet
network and a wire-
less
IEEE 802.11g
standard network (
WLAN
).
Lease time
The lease time defines the period for which PCs keep the
Dynamic IP address
assigned
to them by the
DHCP
server without changing it.
Local IP address
See
Private IP address
MAC address
Media Access Control
The MAC address is used for the globally unique identification of a
Network adapter
. It
comprises six parts (hexadecimal numbers), e.g. 00-90-96-34-00-1A. The MAC address
is assigned by the network adapter's manufacturer and should not be changed.
Mbps
Million bits per second
Specification of the transfer speed in a network.
MER
MAC Encapsulated Routing
Special form of transmission protocol for the Internet.
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 be carried over the net-
work at any one time.

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