Asus Internet Security Router User Manual download pdf (Page 162)

Appendix 16. Glossary Internet Security Router User’s Manual

146

between your ISP and your computer. The WAN interface on the Internet Security

Router uses two forms of PPP called PPPoA and PPPoE. See also PPPoA, PPPoE.

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-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.

rule See filtering rule, NAT rule.

SDNS Secondary Domain Name System (server)

A DNS server that can be used if the primary DSN server is not available. See DNS.

SNMP Simple Network Management Protocol

The TCP/IP protocol used for network management.

subnet A subnet is a portion of a network. The subnet is distinguished from the larger network

by a subnet mask which 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

also network mask.

subnet mask A mask that defines a subnet. See also 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 suite of protocols.

Telnet An interactive, character-based program used to access a remote computer. While

HTTP (the web protocol) and FTP only allow you to download files from a remote

computer, Telnet allows you to log into and use a computer from a remote location.

TFTP Trivial File Transfer Protocol

A protocol for file transfers, TFTP is easier to use than File Transfer Protocol (FTP) but

not as capable or secure.

TTL Time To Live

A field in an IP packet that limits the life span of that packet. Originally meant as a time

duration, the TTL is usually represented instead as a maximum hop count; each router

that receives a packet decrements this field by one. When the TTL reaches zero, the

packet is discarded.

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