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LAN: Local Area Network. A LAN is a network connecting computers and other devices
within an office or building.
Lease: The amount of time a DHCP Server reserves an address it has assigned. If the
address isn’t used by the Host for a period of time, the lease can expire and the address
can be assigned to another host.
MAC Address:
MAC stands for Media Access Control. A MAC address, also called
a Hardware Address or Physical Address, is a unique address assigned to a device at
the factory. It resides in the device’s memory and is often printed on the outside of the
device. It is used by Routers to send network traffic to the correct IP Address. Example:
00-0B-82-12-0C-48
Network Administrator:
The person responsible for setting up and maintaining a
network. The network administrator’s job includes making sure that space is available
on the file server, that the file server is backed up regularly, that new employees can
access the network, troubleshooting network problems, and other tasks.
Physical Address:
See MAC Address
Router:
A device that forwards data from one network to another. In order to send
information to the right location, routers look at IP Addresses, MAC Addresses, and
Subnet Masks.
SIP:
Session Initiation Protocol. An IP telephony signaling protocol primarily used for
VoIP calls but which can also be used for video or any media type. SIP establishes ses-
sions using these technologies and deploys them over IP networks, enabling service
providers to integrate basic IP telephony services with internet, email and chat services.
SIP servers also support traditional telephony features like call forwarding.
Static IP Address:
A static IP Address is assigned manually and is permanent until it
is manually removed. It is not subject to the lease limitations of a Dynamic IP Address
assigned by the DHCP Server.
Subnet Mask:
A type of address filter used by Routers to send data to the correct loca-
tion. This is one of the pieces of information needed to manually set an IP Address. It
also signifies the number of IP addresses and the scope available.
VoIP Gateway:
This is a generic term that covers a variety of devices, all of which
at some point act as digital-to-analog converters. The essential function of a VoIP gate-
way is to convert an analog voice signal to digital information so it can be sent out on
a network, making VoIP possible. This conversion function is often built into other
devices like routers or cable/DSL modems. If the gateway’s only function is to convert
digital to analog and vice versa, it is called an ATA.
WAN: Wide Area Network. A WAN is a network comprising a large geographical
area like a state or country. The largest WAN is the Internet.
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