Abstract Syntax Notation One See ASN1

access list. List kept by routers to control access to or from the router for a number of services (for example, to prevent packets with a certain IP address from leaving a particular interface on the router).

access method. 1. Generally, the way in which network devices access the network medium. 2. Software within an SNA processor that controls the flow of information through a network.

access server. Communications processor that connects asynchronous devices to a LAN or WAN through network and terminal emulation software. Performs both synchronous and asynchronous routing of supported protocols. Sometimes called a network access server. Compare with communication server.

accounting management. One of five categories of network management defined by ISO for management of OSI networks. Accounting management subsystems are responsible for collecting network data relating to resource usage. See also configuration management, fault management, performance management, and security management.

ACF. Advanced Communications Function. A group of SNA products that provides distributed processing and resource sharing. See also ACF/NCP.

ACF/NCP. Advanced Communications Function/Network Control Program. The primary SNA NCP. ACF/NCP resides in the communications controller and interfaces with the SNA access method in the host processor to control network communications. See also ACF and NCP.

ACK. See acknowledgment.

acknowledgment. Notification sent from one network device to another to acknowledge that some event (for example, receipt of a message) has occurred. Sometimes abbreviated ACK. Compare with NAK.

ACR. allowed cell rate. Parameter defined by the ATM Forum for ATM traffic management. ACR varies between the MCR and the PCR, and is dynamically controlled using congestion control mechanisms. See also MCR and PCR.

ACSE. association control service element. An OSI convention used to establish, maintain, or terminate a connection between two applications.

active hub. A multiported device that amplifies LAN transmission signals.

active monitor. A device responsible for managing a Token Ring. A network node is selected to be the active monitor if it has the highest MAC address on the ring. The active monitor is responsible for management tasks such as ensuring that tokens are not lost or that frames do not circulate indefinitely. See also ring monitor and standby monitor.

adapter. See NIC (network interface card).

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