6381-A4 Router Users Guide
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PPP Point-to-Point
Protocol
A protocol for serial data transmission that is used to carry IP (and other
protocol) data between your ISP and your computer. The WAN interface
on the device uses two forms of PPP called PPPoA and PPPoE. See
PPPoA, PPPoE.
PPPoA
Point-to-Point Protocol over ATM
One of the two types of PPP interfaces you can define for a Virtual Circuit
(VC), the other type being PPPoE. You can define only one PPPoA
interface per VC.
PPPoE
Point-to-Point Protocol over Ethernet
One of the two types of PPP interfaces you can define for a Virtual Circuit
(VC), the other type being PPPoA. You can define one or more PPPoE
interfaces per VC.
Protocol
A set of rules governing the transmission of data. In order for a data
transmission to work, both ends of the connection have to follow the rules
of the protocol.
Remote
In a physically separate location. For example, an employee away on
travel who logs in to the company’s intranet is a remote user.
RIP
Routing Information Protocol
The original TCP/IP routing protocol. There are two versions of RIP:
version I and version II.
RJ-11
Registered Jack Standard-11
The standard plug used to connect telephones, fax machines, modems,
etc. to a telephone port. It is a 6-pin connector usually containing four
wires.
RJ-45
Registered Jack Standard-45
The 8-pin plug used in transmitting data over phone lines. Ethernet
cabling usually uses this type of connector.
Routing
Forwarding data between your network and the Internet on the most
efficient route, based on the data’s destination IP address and current
network conditions. A device that performs routing is called a router.
SDNS
Secondary Domain Name System (server)
A DNS server that can be used if the primary DSN server is not available.
See DNS.
Subnet
A subnet is a portion of a network. The subnet is distinguished from the
larger network by a subnet mask that selects some of the computers of
the network and excludes all others. The subnet’s computers remain
physically connected to the rest of the parent network, but they are
treated as though they were on a separate network. See network mask.
Subnet mask
A mask that defines a subnet. See network mask.
TCP See
TCP/IP.
TCP/IP
Transmission Control Protocol/Internet Protocol
The basic protocols used on the Internet. TCP is responsible for dividing
data up into packets for delivery and reassembling them at the
destination, while IP is responsible for delivering the packets from source
to destination. When TCP and IP are bundled with higher-level
applications such as HTTP, FTP, Telnet, etc., TCP/IP refers to this whole
