TCP/IP Management Programming Manual

Glossary
HP NonStop TCP/IP Management Programming Manual—529636-001
Glossary-5
Domain Name Server (DNS)
Domain Name Server (DNS). A method for naming resources. The basic function of the
domain name server is to provide information about network objects by answering
queries.
Domain. In the Internet, a part of the naming hierarchy. Syntactically, a domain name
consists of a sequence of names (labels) separated by periods (dots).
DSM. See Distributed Systems Management (DSM).
E4SA. See Ethernet 4 ServerNet adapter (E4SA).
ECHO. The name of a program used in the Internet to test the reachability of destinations by
sending them an ICMP echo request and waiting for a reply.
Exterior Gateway Protocol (EGP). The protocol used by a gateway in one autonomous
system to advise the Internet addresses of networks in that autonomous system to a
gateway in another autonomous system. Every autonomous system must use EGP to
advertise network reachability to the core gateway system.
empty response record. In DSM programmatic interfaces, a response record containing
only a return token with a value that means “no more response records.” See also
return token.
EMS. See Event Management Service (EMS).
EMS standard definitions. The set of declarations provided by EMS for use in event
management, regardless of the subsystem. Any application that retrieves tokens from
event messages needs the EMS standard definitions. See also definition or definition
files. Compare data communications standard definitions or SPI standard definitions.
error. In DSM interfaces, a condition that causes a command or other operation to fail.
Contrast Warning.
error list. In DSM programmatic interfaces, a group of tokens used within a response
record to provide error and warning information. An error list consists of a list token that
denotes an error list (different from the token that starts a data list or a generic list),
followed by an error token, other tokens explaining the error (optional), and an end-list
token. Error lists can be nested within other error lists. The return token cannot be
included in an error list. See also return token.
error number. In DSM programmatic interfaces, a value that can be assigned to a return
token, or to the last field of an error token, to identify an error that occurred. Some error
numbers are defined in the data communications (ZCOM) definitions; others are
defined by individual subsystems.
error token. In DSM programmatic interfaces, a token in a response message that indicates
the reason an error occurred during a programmatic command. NonStop subsystems
enclose each error token in an error list, which can also contain additional information
about the error. A response record must contain a return token and can also contain