Cisco Access Registrar 3.5 Reference Manual page 71

P
A block of data in a standard format for transmission.
packet
Password Authentication Protocol is a simple PPP authentication mechanism in which a cleartext
PAP
username and password are transmitted to prove identity.
The contents of a request packet.
Payload
Protocol Data Unit—An SNMP compliant request, response, or trap message.
PDU
Provider Edge router—a router located at the edge of the provider's MPLS core network.
PE Router
Point of Presence is the dial-in point or connection point for users connecting to an ISP.
POP
Packet Processing Delay is the amount of time required for each peer to process the maximum amount
PPD
of data buffered in their offered receive packet window. The PPD is the value exchanged between the
LAC and LNS when a call is established. For the LNS, this number should be small. For an LAC
supporting modem connections, this number could be significant.
Point-to-Point Protocol—a multiprotocol and includes UDP, Frame Relay PVC, and X.25 VC.
PPP
A collection of one or more attributes that describe how a user should be configured; for example, a
Profile
profile may contain an attribute whose value specifies the type of connection service to provide the
user, such as PPP, SLIP, or Telnet. Profiles can be set up for a specific user or can be shared amongst
users.
Service Provider—A provider who operates the access networks and MPLS backbone and provides
Provider
MPLS VPN service on the backbone.
Public Switched Telephone Network enables async PPP through modems.
PSTN
Q
A given Quality of Service level is sometimes required for a given user being tunneled between an
Quality of Service
LNS-LAC pair. For this scenario, a unique L2TP tunnel is created (generally on top of a new SVC) and
(QOS)
encapsulated directly on top of the media providing the indicated QOS.
R
The IOS DHCP client used to generate requests for host addresses and subnets for non-PPP clients.
RAC Client
Remote Authentication Dial-In User Service. The RADIUS protocol provides a method that allows
RADIUS
multiple dial-in Network Access Server (NAS) devices to share a common authentication database.
A Network Access Server (NAS) operates as a client of RADIUS. The client is responsible for passing
RADIUS Client
user information to designated RADIUS servers, and then acting on the response that is returned. A
RADIUS server can act as a proxy client to other RADIUS servers.
OL-2683-02
Cisco Access Registrar 3.5 Concepts and Reference Guide
Glossary
GL-5