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5-6
SECTION 5, GLOSSARY
IP Address
A unique 32-bit value that identifies each host on a TCP/IP
network. TCP/IP networks route messages based on the
destination IP address.
For a Class C network, the first 24 bits are the network address
and the final 8 bits are the host address; in dotted-decimal format
it appears “network.network.network.host.”
ISDN
Integrated Services Digital Network
ISP
Internet Service Provider
L
LAN
Local Area Network. A local area network provides a full-time,
high-bandwidth connection over a limited area such as a home,
building, or campus. Ethernet is the most widely used LAN
standard.
M
MAC Address
The Media Access Control address is a unique, 48-bit value
permanently saved in the ROM at the factory to identify each
Ethernet network device. It is expressed as a sequence of 12
hexadecimal digits printed on the unit’s label. You need to
provide the MAC Address to the cable service provider. Also
called an Ethernet address, physical address, hardware address,
or NIC address.
MB
One megabyte; equals 1,024 x 1,024 bytes, 1,024 kilobytes, or
about 8 million bits.
Mbps
Million bits per second (megabits per second). A rate of data
transfer.
MTU
The Maximum Transmission Unit is the largest amount of data
that can be transmitted in one discrete message on a given
physical network. The MTU places an upper bound limit on the
size of a message that can be transferred by the network in a
single frame. Messages exceeding the MTU must be fragmented
before transmission, and reassembled at the destination.
Page 87 / 93
SECTION 5, GLOSSARY
5-7
Multicast
A data transmission sent from one sender to multiple receivers.
See also broadcast and unicast.
N
NAT
Network Address Translation is an Internet standard for a LAN to
use one set of IP addresses for internal traffic and a second set
of IP addresses for external traffic. NAT provides some security
because the IP addresses of LAN computers are invisible on the
Internet.
Network
Two or more computers connected to communicate with each
other. Networks have traditionally been connected using some
kind of wiring.
NIC
A Network Interface Card converts computer data to serial data in
a packet format that it sends over the LAN. A NIC is installed in
an expansion slot or can be built-in. Every Ethernet NIC has a
MAC address permanently saved in its ROM.
P
Packet
The unit of data that is routed between the sender and
destination on the Internet or other packet-switched network.
PCMCIA
The Personal Computer Memory Card International Association
sets international standards for connecting peripherals to portable
computers. Laptop computers typically have a PCMCIA slot that
can hold one or two PC Cards to provide features such as
Ethernet connectivity.
PING
A network utility that tests host reachability by sending a small
packet to the host and waiting for a reply. If you PING a computer
IP address and receive a reply, you know the computer is
reachable over the network. It also stands for “Packet InterNet
Groper.”
Port Triggering
A mechanism that allows incoming communication with specified
applications.
Page 88 / 93
5-8
SECTION 5, GLOSSARY
PPP
Point-to-Point Protocol is used to transport other protocols,
typically for simple links over serial lines. It is most commonly
used to access the Internet with a dial-up modem.
PPPoE
Point-to-Point Protocol over Ethernet. Used by many DSL Internet
Service Providers for broadband connection.
PPTP
Point-to-Point Tunneling Protocol encapsulates other protocols. It
is a new technology to create VPNs developed jointly by several
vendors.
Private IP Address
An IP address assigned to a computer on the WR850G LAN by
the DHCP server for a specified lease time. Private IP addresses
are invisible to devices on the Internet. See also
Public IP
Address
.
Protocol
A formal set of rules and conventions for exchanging data.
Different computer types (for example PC, UNIX, or mainframe)
can communicate if they support common protocols.
Public IP Address
The IP address assigned to the WR850G by the service provider.
A public IP address is visible to devices on the Internet. See also
Private IP Address
.
R
RJ-11
The most common type of connector for household or office
phones.
RJ-45
An 8-pin modular connector; the most common connector type for
10Base-T or 100Base-T Ethernet networks.
Roaming
The ability to transfer your wireless session from one AP to
another AP seamlessly.
ROM
Read-Only Memory.
Router
On IP networks, a device connecting at least two networks, which
may or may not be similar. A router is typically located at a
gateway between networks. A router operates on OSI network
Page 89 / 93
SECTION 5, GLOSSARY
5-9
Layer 3. It filters packets based on the IP address, examining the
source and destination IP addresses to determine the best route
to forward them.
A router is often included as part of a network switch. A router
can also be implemented as software on a computer.
Routing Table
A table listing available routes that is used by a router to
determine the best route for a packet.
RTS
Request To Send.
S
Server
In a client/server architecture, a dedicated computer that supplies
files or services such as file transfer, remote login, or printing to
clients. Also see
client.
Service Provider
A company providing Internet connection services to subscribers.
SMTP
Simple Mail Transfer Protocol is a standard Internet protocol for
transferring e-mail.
Static IP Address
An IP address that is permanently assigned to a host. Normally, a
static IP address must be assigned manually. The opposite of
Dynamic IP Address
.
Station
IEEE 802.11b term for wireless client.
Subscriber
A user who accesses television, data, or other services from a
service provider.
Subnet Mask
A methodology that determines what the router will examine for
the destination of an IP address. A router delivers packets using
the network address.
Switch
On an Ethernet network, a switch filters frames based on the
MAC address, in a manner similar to a bridge. A switch is more
advanced because it can connect more than two segments.
Page 90 / 93
5-10
SECTION 5, GLOSSARY
T
TCP
Transmission Control Protocol on OSI Transport Layer 4 provides
reliable transport over the network for data transmitted using IP
(network layer three). It is an end-to-end protocol defining rules
and procedures for data exchange between hosts on top of
connectionless IP. TCP uses a timer to track outstanding packets,
checks error in incoming packets, and retransmits packets if
requested.
TCP/IP
The Transmission Control Protocol/Internet Protocol suite
provides standards and rules for data communication between
networks on the Internet. It is the worldwide Internetworking
standard and the basic communications protocol of the Internet.
Tunnel
To place packets inside other packets to send over a network.
The protocol of the enclosing packet is understood by each
endpoint, or tunnel interface, where the packet enters and exits
the network. VPNs rely on tunneling to create a secure network.
Tunneling requires the following protocol types:
!
A carrier protocol, such as TCP, used by the network that the
data travels over
!
An encapsulating protocol, such as IPSec, L2F, L2TP, or
PPTP, that is wrapped around the original data
!
A passenger protocol, such as IP, for the original data
U
UDP
User Datagram Protocol. A method used along with the IP to
send data in the form of message units (datagram) between
network devices over a LAN or WAN.
Unicast
A point-to-point data transmission sent from one sender to one
receiver. This the normal way you access websites. See also
multicast
.
UPnP
Universal Plug and Play
USB
Universal Serial Bus is a computer interface for add-on devices
such as printers, scanners, mice, modems, or keyboards. USB
supports data transfer rates of 12 Mbps and plug-and-play

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