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3.10.3 Routing Table

Go to

Advance Management -> Routing

to see the Routing Table.

The Routing table allows you to see how many routings on your routing table and interface information

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3.11.1 System Status

Go to

Status -> Device Info

to see the router's information. The System Status page shows the WAN,

LAN and the router's firmware version.

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Appendix A Glossary

Address mask

A bit mask used to select bits from an Internet address for subnet addressing. The mask is 32 bits

long and selects the network portion of the Internet address and one or more bits of the local portion.

Sometimes called subnet mask.

AAL5

ATM Adaptation Layer - This layer maps higher layer user data into ATM cells, making the data

suitable for transport through the ATM network.

ADSL

Asymmetric digital subscriber line

ATM

Asynchronous Transfer Mode - A cell-based data transfer technique in which channel demand

determines packet allocation. ATM offers fast packet technology, real time, demand led switching for

efficient use of network resources.

AWG

American Wire Gauge - The measurement of thickness of a wire

Bridge

A device connects two or more physical networks and forwards packets between them. Bridges can

usually be made to filter packets, that is, to forward only certain traffic. Related devices are: repeaters

which simply forward electrical signals from one cable to the other and full-fledged routers which make

routing decisions based on several criteria.

Broadband

Characteristic of any network multiplexes independent network carriers onto a single cable.

Broadband technology allows several networks to coexist on one single cable; traffic from one network

does not interfere with traffic from another. Broadcast A packet delivery system where a copy of a

given packet is given to all hosts attached to the network. Example: Ethernet.

CO

Central Office. Refers to equipment located at a Telco or service provider's office.

CPE

Customer Premises Equipment located in a user's premises

DHCP (Dynamic Host Configuration Protocol)

DHCP is software that automatically assigns IP addresses to client stations logging onto a TCP/IP

network. DHCP eliminates having to manually assign permanent IP addresses to every device on your

network. DHCP software typically runs in servers and is also found in network devices such as

Routers.

DMT

Discrete Multi-Tone frequency signal modulation

Downstream rate

The line rate for return messages or data transfers from the network machine to the user's premises

machine.

DSLAM

Digital Subscriber Line Access Multiplex

Dynamic IP Addresses

A dynamic IP address is an IP address that is automatically assigned to a client station (computer,

printer, etc.) in a TCP/IP network. Dynamic IP addresses are typically assigned by a DHCP server,

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which can be a computer on the network or another piece of hardware, such as the Router. A dynamic

IP address may change every time your computer connects to the network.

Encapsulation

The technique used by layered protocols in which a layer adds header information to the protocol data

unit (PDU) from the layer above. As an example, in Internet terminology, a packet would contain a

header from the physical layer, followed by a header from the network layer (IP), followed by a header

from the transport layer (TCP) and followed by the application protocol data.

Ethernet

One of the most common local area network (LAN) wiring schemes, Ethernet has a transmission rate

of 10 Mbps.

FTP

File Transfer Protocol. The Internet protocol (and program) used to transfer files between hosts.

Hop count

A measure of distance between two points on the Internet. It is equivalent to the number of gateways

that separate the source and destination.

HTML

Hypertext Markup Language - The page-coding language for the World Wide Web.

HTML browser

A browser used to traverse the Internet, such as Netscape or Microsoft Internet Explorer.

HTTP

Hypertext Transfer Protocol - The protocol used to carry world-wide-web (www) traffic between a www

browser computer and the www server being accessed.

ICMP

Internet Control Message Protocol - The protocol used to handle errors and control messages at the

IP layer. ICMP is actually part of the IP protocol.

Internet address

An IP address is assigned in blocks of numbers to user organizations accessing the Internet. These

addresses are established by the United States Department of Defense's Network Information Center.

Duplicate addresses can cause major problems on the network, but the NIC trusts organizations to

use individual addresses responsibly. Each address is a 32-bit address in the form of x.x.x.x where x

is an eight- bit number from 0 to 255. There are three classes: A, B and C, depending on how many

computers on the site are likely to be connected.

Internet Protocol (IP)

The network layer protocol for the Internet protocol suite

IP address

The 32-bit address assigned to hosts that want to participate in a TCP/IP Internet.

ISP

Internet service provider - A company allows home and corporate users to connect to the Internet.

MAC

Media Access Control Layer - A sub-layer of the Data Link Layer (Layer 2) of the ISO OSI Model

responsible for media control.

MIB

Management Information Base - A collection of objects can be accessed via a network management

protocol, such as SNMP and CMIP (Common Management Information Protocol).

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NAT

Network Address Translation - A proposal for IP address reuse, where the local IP address is mapped

to a globally unique address.

NVT

Network Virtual Terminal

PAP

Password Authentication Protocol

PORT

The abstraction used by Internet transport protocols to distinguish among multiple simultaneous

connections to a single destination host.

POTS

Plain Old Telephone Service - This is the term used to describe basic telephone service.

PPP

Point-to-Point-Protocol - The successor to SLIP, PPP provides router-to-router and host-to-network

connections over both synchronous and asynchronous circuits.

PPPoE

PPP over Ethernet is a protocol for connecting remote hosts to the Internet over an always-on

connection by simulating a dial-up connection.

Remote server

A network computer allows a user to log on to the network from a distant location.

RFC

Request for Comments - Refers to documents published by the Internet Engineering Task Force

(IETF) proposing standard protocols and procedures for the Internet. RFCs can be found at

www.ietf.org

Route

The path that network traffic takes from its source to its destination. The route a datagram may follow

can include many gateways and many physical networks. In the Internet, each datagram is routed

separately.

Router

A system responsible for making decisions about which of several paths network (or Internet) traffic

will follow. To do this, it uses a routing protocol to gain information about the network and algorithms to

choose the best route based on several criteria known as "routing metrics".

routing table

Information stored within a router that contains network path and status information. It is used to select

the most appropriate route to forward information along.

Routing Information Protocol

Routers periodically exchange information with one another so that they can determine minimum

distance paths between sources and destinations.

SNMP

Simple Network Management Protocol - The network management protocol of choice for TCP/IP-

based Internet.

SOCKET

(1) The Berkeley UNIX mechanism for creating a virtual connection between processes.

(2) IBM term for software interfaces that allow two UNIX application programs to talk via TCP/IP

protocols.