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Glossary
• The
Broadcast Address
consists of a host number that is all ones (for example,
192.168.2.255).
There are a finite number of IP addresses that can exist. Therefore, a local area network typically
uses one of the
IANA
-designated address ranges for use in private networks. These address
ranges are:
10.0.0.0 to 10.255.255.255
172.16.0.0 to 172.31.255.255
192.168.0.0 to 192.168.255.255
A
Dynamic IP Address
is an IP address that is automatically assigned to a host by a
DHCP
server
or similar mechanism. It is called dynamic because you may be assigned a different IP address
each time you establish a connection.
A
Static IP Address
is an IP address that is hard-wired for a specific host. A static address is
usually required for any host that is running a server, for example, a Web server.
IPSec
IP Security
(IPSec) is a set of protocols to support the secure exchange of packets at the
IP
layer.
It uses shared public keys. There are two encryption modes: Transport and Tunnel.
•
Transport
mode encrypts only the data portion (payload) of each packet, but leaves the headers
untouched.
• The more secure
Tunnel
mode encrypts both the header and the payload.
ISP
An
Internet Service Provider
(ISP) is a company that provides access to the Internet to individuals
and companies. It may provide related services such as virtual hosting, network consulting, Web
design, etc.
Jitter
Jitter
is the difference between the latency (or delay) in packet transmission from one node to
another across a network. If packets are not transmitted at a consistent rate (including
Latency
),
QoS
for some types of data can be affected. For example, inconsistent transmission rates can
cause distortion in VoIP and streaming media.
QoS
is designed to reduce jitter along with other
factors that can impact network performance.
Latency
Latency
, also known as
delay
, is the amount of time it takes to transmit a
Packet
from sender to
receiver. Latency can occur when data is transmitted from the access point to a client and vice
versa. It can also occur when data is transmitted from access point to the Internet and vice versa.
Latency is caused by
fixed network
factors such as the time it takes to encode and decode a
packet, and also by
variable network
factors such as a busy or overloaded network.
QoS
features
are designed to minimize latency for high priority network traffic.
LAN
A
Local Area Network
(LAN) is a communications network covering a limited area, for example,
the computers in your home that you want to network together or a couple of floors in a building.
A LAN
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