Technical data

Glossary
This glossary defines terms that pertain to the features and operation of the
Compaq TCP/IP Services for OpenVMS product.
absolute path name
A path name that starts with a slash (/); specifies a file that can be found by
starting at the root of the file system and traversing the file tree.
absolute time
A specific date or time of day; specified in the following format: [dd-mmm-yyyy]
[:hh:mm:ss:cc].
abstract syntax
The description of a data structure that is independent of host structures or codes.
Abstract Syntax Notation One (ASN.1)
The language used by ISO protocols for describing abstract syntax. Most notable
use in TCP/IP is for Simple Network Management Protocol (SNMP). The rules of
ASN.1 are independent of the encoding techniques used to represent them.
access control information
A character string with login information that validates connect or login at a
remote host.
access control list (ACL)
A list that defines the kinds of access to be granted or denied to users.
access rights
A set of privileges that determines what users can do.
ACK
See acknowledgment.
acknowledgment (ACK)
A type of message sent to indicate that a block of data arrived at its destination
without error. A control bit (acknowledgment flag) in the TCP header indicates
that the acknowledgment number field is significant for each segment in a packet.
ACL
See access control list.
ACP
See ancillary control process.
active port
A port that is bound to a process.
address
A number or group of numbers that uniquely identifies a network node within its
own network or internet. See also IP address and hardware address.
address mask
A 32-bit value used to identify which bits in an IP address correspond to the
network and subnet portions of the address.
Glossary–1