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Glossary
s1d
s1e
s1f
Service Subscriber
SNMP
SNMP Agent
SNMP Trap
Source-Based
Routing
Static Route
Subnet Address Mask
TCP
Telnet
TFTP
TraceRoute
UDP
VLAN
VLAN Switch
WAN
WAN-C
GL-4
Interface name of a DSL card's DSL port #2.
Interface name of a DSL card's DSL port #3.
Interface name of a DSL card's DSL port #4.
The service subscriber is the user (or set of users) that has contracted to receive
networking services (e.g., Intranet access, remote LAN access) from one or more Network
Service Providers (NSPs).
Simple Network Management Protocol. An application-level protocol used in network
management.
An application level program typically running on a host system which facilitates
communication to an NMS manager. See NMS.
A notification message to the SNMP manager when an unusual event occurs on a network
device, such as a reinitialization.
A security feature for preventing end-user system to end-user system routing when the
end-user systems are attached to LANs on different RTUs (that are attached to the same
DSL card). That is, sourced-based routing can ensure that all upstream traffic within a
customer domain is sent to the NSP.
A permanent entry into the routing table that is manually entered. Static routes take
precedence over routes chosen by dynamic routing protocols.
A bit mask used to select bits from an IP address for subnet addressing. The mask is
32 bits long and selects the network portion of the IP address and one or more bits of the
local portion. This allows a subnet to be identified so that an IP address can be shared on
a LAN.
Transmission Control Protocol. The TCP/IP standard transport level protocol that links
dissimilar computers across many kinds of networks and provides the reliable, full-duplex,
stream service on which many application protocols depend.
A simple remote terminal protocol that is part of the Transmission Control Protocol/Internet
Protocol (TCP/IP) protocol suite. Telnet allows the user of one host computer to log into a
remote host computer, and interact as a normal terminal user for that host.
Trivial File Transfer Protocol. This is a simplified version of FTP that transfers files without
password protection or user-directory capability. It depends on the connectionless
datagram delivery service, UDP.
A program that prints the path to a destination. It is a superset of the Ping utility used to
evaluate the hops taken from one end of a link to another.
User Datagram Protocol. An IP protocol describing how messages reach application
programs within a destination computer. UDP is a transport layer, connectionless mode
protocol, providing a datagram mode of communication for delivery of packets to a remote
or local user.
Virtual Local Area Network. A logical grouping of users regardless of their physical location
on the network.
A layer 2 networking device.
Wide Area Network. It uses common DSLAM-provided lines that cover an extended
geographical area.
Wide Area Network Concentrator. The WAN-C concentrates data traffic from one or more
DSLAMs onto facilities providing access to the WAN. The WAN-C can be either a router (a
layer 3 networking device) or a VLAN switch (a layer 2 networking device).
November 1997
8000-A2-GB21-20
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