Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-5
connection-oriented
connection-oriented. Characterized by logical connections between communicating
entities. Connection-oriented protocols ensure that data arrives at its destination in
sequence and error-free. Contrast with connectionless.
connectivity. The ability of a system to communicate meaningfully with other systems and
devices by way of communications protocols.
controller. See ServerNet addressable controller (SAC).
cooperative processing. Process-to-process data communications between systems or
between a system and an intelligent device.
CSMA/CD. See Carrier Sense Multiple Access with Collision Detection (CSMA/CD).
data communications. The transmission of data among computing devices. Often used to
refer only to low levels of protocol.
datagram. A packet of data that includes all addressing information required to move it from
source to destination. Associated with protocols that do not establish and maintain
logical connections between communicating entities.
data-link control. A set of functions associated with Layer 2 of the Open Systems
Interconnection (OSI) Reference Model. Responsible for reliable communication
between nodes. (When applications communicate with devices or other applications,
the data can travel through many intermediate nodes; data-link protocols accomplish
reliable communication between two physically connected nodes.) Also used by non-
OSI architectures such as IBM Systems Network Architecture (SNA).
Data-Link Layer. Layer 2 of the Open Systems Interconnection (OSI) Reference Model.
The functions of this layer include packaging data for transmission across the network
and ensuring that the data arrives at the next layer without any errors.
data stream. The sequence of bits produced or interpreted by a device, in conformance
with the protocol
of that device.
device emulation. Software that allows a device such as a workstation, terminal, or system
to affect the behavior of another kind of device or system, usually to permit access to
applications running in other vendors’ systems.
distributor. A process, defined by the Event Management Service (EMS), responsible for
sending event messages to applications, files, printers, or remote nodes.
domain. (1) In HP NonStop S-series servers, a set of objects over which control or
ownership is maintained. Types of domains include power domains and service
processor (SP) domains. (2) In IBM Systems Network Architecture (SNA)
, a division of
a network for control or administrative purposes. A domain consists of a system
services control point and the resources it controls. (3) In Transmission Control
Protocol/Internet Protocol (TCP/IP), a domain is a division of a network for naming and