User manual

Cobalt RaQ XTR User Manual 303
Kernel
The essential center of a computer operating system, the core that provides
basic services for all other parts of the operating system. A kernel can be
contrasted with a shell, the outermost part of an operating system that
interacts with user commands. Kernel and shell are terms used more
frequently in UNIX.
See also Shell.
LAN
See local area network (LAN).
Leased IP address
An IP address assigned by the Dynamic Host Configuration Protocol
(DHCP) to an unrecognized computing device. This method involves setting
up a leased pool of IP addresses that are allocated dynamically when new
devices are booted and recognized on the network.
Local area network (LAN)
A high-speed, low-error data network covering a relatively small geographic
area (up to a few thousand meters). A LAN connects workstations,
peripherals, terminals and other devices in a single building or other
geographically limited area. LAN standards specify cabling and signaling at
the physical and data link layers of the Open Systems Interconnection (OSI)
model. Widely used LAN technologies include Ethernet, fiber distributed
data interface (FDDI) and token ring.
See also wide area network (WAN).
Logical memory
See virtual memory.
Media access control (MAC) sublayer
The lower of the two sublayers of the data link layer defined by the IEEE.
The MAC sublayer handles access to shared media, such as whether token
passing or contention is used.