79
Keys
Keys
are
used
like
passwords
to
open
and
close
(encrypt
and
decrypt)
messages.
While
many
encryption
algorithms
are
commonly
known
and
public,
the
key
must
be
kept
secret.
Local
‐
Area
Network
(LAN)
A
small
data
network
covering
a
limited
area,
such
as
a
building
or
group
of
buildings.
Most
LANs
connect
workstations
or
personal
computers.
This
allows
many
users
to
share
devices,
such
as
printers,
as
well
as
data.
The
LAN
also
allows
easy
communication,
by
facilitating
e
‐
or
supporting
chat
sessions.
Media
Access
Control
(MAC)
Address
The
address
associated
with
every
hardware
device
on
the
network.
Every
802.11
wireless
device
has
its
own
specific
MAC
address
hard
‐
coded
into
it.
This
unique
identifier
can
be
used
to
provide
security
for
WLANs.
When
a
network
uses
a
MAC
table,
only
the
802.11
radios
that
have
had
their
MAC
addresses
added
to
that
network's
MAC
table
are
able
to
get
onto
the
network.
Network
Address
Translation
(NAT)
An
Internet
standard
that
enables
a
LAN
to
use
one
set
of
IP
addresses
for
internal
traffic
and
a
second
set
of
addresses
for
external
traffic.
Network
Time
Protocol
(NTP)
A
protocol
that
allows
devices
to
synchronize
their
time
with
a
time
server.
It
uses
TCP
or
UDP
port
123
by
default
Passphrase
A
text
string
used
to
automatically
generate
WEP
keys
on
wireless
client
adapters.
Power
Over
Ethernet
(PoE)
The
ability
to
provide
power
to
a
PoE
‐
enabled
device
via
an
8
‐
pin
CAT
5
Ethernet
cable,
eliminating
the
need
for
a
nearby
power
source.
Preamble
Used
to
synchronize
transmissions
in
a
WLAN.
The
preamble
type
defines
the
length
of
the
Cyclic
Redundancy
Check
block
for
communication
between
the
device
and
roaming
wireless
stations.
Protected
Extensible
Authentication
Protocol
(PEAP)
An
authentication
protocol
of
IEEE
802.1x
used
to
transmit
authentication
data,
including
passwords,
over
802.11
WLANs.
Quality
of
Service
(QoS)
Refers
to
a
network’s
ability
to
deliver
data
with
minimum
delay,
and
to
the
networking
methods
used
to
provide
bandwidth
for
real
‐
time
multimedia
applications.
Remote
Authentication
Dial
‐
In
User
Service
(RADIUS)
A
networking
protocol
that
provides
centralized
authentication,
authorization,
and
accounting
management
for
computers
to
connect
and
use
a
network
service.
Because
of
the
broad
support
and
the
ubiquitous
nature
of
the
RADIUS
protocol,
it
is
often
used
by
ISPs
and
enterprises
to
manage
access
to
the
Internet
or
internal
networks,
WLANs,
and
integrated
e
‐
services.
Service
Set
Identifier
(SSID)
The
name
of
a
WLAN.
All
wireless
devices
on
a
WLAN
must
use
the
same
SSID
in
order
to
