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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.

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