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- Glossary
Class C - supports 254 hosts on each of 2 million networks
The number of unassigned Internet addresses is running out, so a new classless scheme called CIDR is
gradually replacing the system based on classes A, B, and C and is tied to adoption of IPv6.
IRQ
Interrupt Request. An acronym for the hardware signal to the CPU that an external event has occurred
which needs to be processed.
KB
Kilobyte. One thousand bytes.
LAN
Local Area Network. An interconnection of computers and peripherals within a single limited geographic
location which can pass programs and data amongst themselves.
LCD
Liquid Crystal Display. A type of display which makes images by controlling the orientation of crystals
in a crystalline liquid.
Lithium ion Battery
A type of rechargeable battery which has a high power-time life for its size and is not subject to the
memory effect as Nickel Cadmium batteries.
MAC Address
Media Access Control Address. A unique physical address of a network card. For Ethernet, the first three
bytes are used as the vendor code, controlled and assigned by IEEE. The remaining three bytes are
controlled by each vendor (preventing overlap), therefore, every Ethernet card is given a unique physical
address in the world, being assigned with a different address from other cards. For Ethernet, frames are
sent and received based on this address.
MB
Megabyte. One million bytes.
Sparrow T580.book Page 129 Thursday, December 2, 2010 2:07 PM
