TCP/IPv6 Migration Guide

HP NonStop TCP/IPv6 Migration Guide—524524-004
Glossary-1
Glossary
This glossary defines terms used both in this manual and in other NonStop TCP/IP
manuals. Both industry-standard terms and HP terms are included.
address. An IP-layer identifier for an interface or a set of interfaces. See also, deprecated
address, preferred address, valid address and invalid address.
address mask. A bit mask used to select bits from an Internet address for subnet
addressing. The mask is 32 bits long and selects the network portion of the Internet
address and one or more bits from the local portion.
address resolution. Conversion of an Internet address into a corresponding physical
address. Depending on the underlying network, resolution may require broadcasting on
a local network. See also address resolution.
Address Resolution Protocol (ARP). The Internet protocol used to dynamically bind a
high-level Internet Address to a low-level physical hardware address. ARP applies only
across a single physical network and is limited to networks that support hardware
broadcast.
Advanced Projects Research Agency (ARPA). Former name of DARPA, the government
agency that funded the ARPANET and DARPA Internet.
ARP. See Address Resolution Protocol (ARP).
ARPA (Advanced Projects Research Agency). See Advanced Projects Research Agency
(ARPA).
ARPANET. A pioneering long-haul network funded by ARPA (later DARPA) and built by Bolt,
Baranek, and Newman (BBN). It served as the basis for early networking research as
well as a central backbone during the development of the Internet.
asynchronous. A mode of serial-data transmission in which characters are sent at random;
there is no timing relationship between the end of one character and the start of the
next, that is, the transmission is not synchronized with a separate clock signal. The
data contains extra bits: a start bit to signal the beginning of a byte and one or more
stop bits to signal the end of the byte. These start and stop bits allow the receiver to
determine the correct synchronization.
attribute. In DSM, a characteristic of an entity. For example, two attributes of a
communications line might be its baud rate and its retry count. In a token-oriented
interface based on SPI, an attribute of an object is usually expressed as either a simple
token or as a field within an extensible structured token. See also simple token or
extensible structured token.