For All Installations
Subnet Mask
The subnet mask is the method used to divide a TCP/IP network into subnets.
The form of a subnet mask is similar to an IP address: n.n.n.n where n is a
number from 0 to 255. If a subnet mask has not been assigned, the subnet mask
assigned to your computer is typically used. When applied to an IP address, the
subnet mask specifies the portion of the four-component IP address that
identifies the network/subnet, and the portion that identifies the individual host
nodes.
TCP/IP
Transmission Control Protocol/Internet Protocol, the accepted standard
communications protocols for transmitting data over networks, including the
Internet. TCP/IP uses several protocols, the two main ones being TCP and IP.
VoIP
Voice over Internet Protocol, a technology that uses the Internet as the
transmission medium for telephone calls by sending voice data in packets using
IP rather than by traditional circuit transmissions of the PSTN. VoIP is a system
of both hardware and software.
This Internet telephony is gaining in popularity because, with free or fixed price
Internet access through an ISP, it eliminates the need for a separate, dedicated
voice phone line and provides extremely low cost telephone calls to anywhere in
the world.
Disadvantages to VoIP include some loss of quality in voice transmissions and
the interruption or disabling of systems, such as alarm systems, that use PSTN
technologies to communicate through the phone lines.
World Wide Web
The World Wide Web is a system or arrangement of Internet servers supporting
specially formatted documents. Applications called “web browsers” read these
documents to display text, graphics, audio and video files on user’s computers.
The documents also contain “links”, the addresses of other documents, so that a
user can move from one to the other easily.
Not all Internet servers are part of the World Wide Web.
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