User's Manual

28
Glossary
Business Internet Video Camera with Audio
Appendix B
CoS (Class o
f
Service
)
T
h
e 802.1p priority sc
h
eme. CoS
provides a method
f
or tagging packets with priority
in
f
ormation. A CoS value between 0-7 is added to the
Layer II header o
f
packets, where zero is the lowest priority
an
d
seven is t
h
e
h
ig
h
est.
DDNS (Dynam
i
c Doma
i
n Name System
)
A
ll
ows t
h
e
hosting o
f
a website, FTP server, or e-mail server with a
f
ixed domain name (e.g., www.xyz.com) and a dynamic IP
a
dd
ress
.
De
f
ault Gateway A device that
f
orwards Internet tra
ff
ic
f
rom your local area network.
DHCP (Dynamic Host Con
f
iguration Protocol
)
A
networ
k
ing protoco
l
t
h
at a
ll
ows a
d
ministrators to assign
temporary IP a
dd
resses to networ
k
computers
b
y “
l
easing”
an IP address to a user
f
or a limited amount o
f
time, instead
o
f
assigning permanent IP addresses
.
DHCP C
l
ient
s
An Internet
h
ost using DHCP to o
b
tain
con
f
iguration parameters, such as a network address.
DH
C
P
S
erve
r
An Internet host that returns con
f
iguration
parameters to DHCP c
l
ients
.
DNS (Doma
i
n Name Server
)
The IP address o
f
your ISP’s
server, which translates the names o
f
websites into IP
a
dd
resses
.
Doma
in
A speci
f
ic name
f
or a network o
f
computers
.
Down
l
oa
d
To receive a
f
ile transmitted over a network.
DSL (Digita
l
Su
b
scri
b
er Line
)
An a
l
ways-on
b
roa
db
an
d
connection over tra
d
itiona
l
ph
one
l
ines
.
DSCP (Di
ff
Serv Code Point
)
Provides a method o
f
tagging IP packets with QoS priority in
f
ormation
.
Dynamic IP A
dd
res
s
A temporary IP a
dd
ress assigne
d
b
y
a DH
C
P server
.
EIGRP (En
h
ance
d
Interior Gateway Routing
Protoco
l)
Provides
f
ast convergence, support
f
or variable-
l
engt
h
su
b
net mas
k
, an
d
supports mu
l
tip
l
e networ
k
l
ayer
protoco
l
s
.
Encrypt
i
o
n
Enco
d
ing
d
ata transmitte
d
in a networ
k
.
Et
h
erne
t
IEEE standard network protocol that speci
f
ies
how data is placed on and retrieved
f
rom a common
transmission me
d
ium
.
F
i
rmwar
e
T
h
e programming co
d
e t
h
at runs a networ
k
ing
d
evice
.
F
l
ow Contro
l
Ena
bl
es
l
ower spee
d
d
evices to
communicate wit
h
h
ig
h
er spee
d
d
evices. T
h
is is
implemented by the higher speed device re
f
raining
f
rom
sen
d
ing pac
k
ets.
FTP (File Trans
f
er Protocol
)
A protocol used to trans
f
er
f
iles over a TCP/IP network
.
Fu
ll
Dup
l
ex The ability o
f
a networking device to receive
an
d
transmit
d
ata simu
l
taneous
l
y
.
GARP (Genera
l
Attri
b
utes Registration
Protoco
l)
Registers c
l
ient stations into a mu
l
ticast
d
omain
.
G
atewa
y
A
d
evice t
h
at interconnects networ
k
s wit
h
di
ff
erent, incompatible communications protocols
.
GBIC (GigaBit Inter
f
ace Converter
)
A
h
ar
d
ware mo
d
u
l
e
used to attach network devices to
f
iber-based transmission
systems. GBIC converts t
h
e seria
l
e
l
ectrica
l
signa
l
s to seria
l
optica
l
signa
l
s an
d
vice versa
.
GVRP (GARP VLAN Registration Protoco
l
)
R
egisters
c
l
ient stations into a VLANs.
Hal
f
Duple
x
Data transmission t
h
at can occur in two
d
irections over a sing
l
e
l
ine,
b
ut on
l
y one
d
irection at a
t
i
me
.
HTTP (HyperText Transport Protoco
l)
T
h
e
communications protoco
l
use
d
to connect to servers on
t
h
e Wor
ld
Wi
d
e We
b.
HTTPS (HyperText Transport Protoco
l
Secure)
An
extension to t
h
e stan
d
ar
d
HTTP protoco
l
t
h
at provi
d
es
con
f
identiality by encrypting the tra
ff
ic
f
rom the website.
By de
f
ault this protocol uses TCP port 443
.
ICMP (Internet Contro
l
Message Protoco
l
)
All
ows t
h
e
gateway or
d
estination
h
ost to communicate wit
h
t
h
e
source
h
ost. For examp
l
e, to report a processing error.
IGMP (Internet Group Management Protoco
l)
All
ows
hosts to noti
f
y their local switch or router that they want
to receive transmissions assigned to a speci
f
ic multicast
gro
u
p.
IP (Internet Protoco
l)
A protoco
l
use
d
to sen
d
d
ata over
a networ
k.
IP A
dd
res
s
The address used to identi
f
y a computer or
d
evice on a networ
k.
IPC
O
NFI
G
A Win
d
ows 2000 an
d
XP uti
l
ity t
h
at
d
isp
l
ays
the IP address
f
or a particular networking device.
IPSec (Internet Protoco
l
Security
)
A VPN protoco
l
use
d
to implement secure exchange o
f
packets at the IP layer.
ISP (Internet Service Provi
d
er) A company t
h
at provi
d
es
access to t
h
e Internet
.
Jum
b
o Frame
s
Ena
bl
e transporting i
d
entica
l
d
ata in
f
ewer
f
rames. Jumbo Frames reduce overhead, lower
processing time, and ensure
f
ewer interrupts
.
LAG (Lin
k
Aggregate
d
Group
)
A
ggregates ports or
VLANs into a sing
l
e virtua
l
port or VLAN
.
LAN
T
h
e computers an
d
networ
k
ing pro
d
ucts t
h
at ma
k
e
up your
l
oca
l
networ
k.