Reference Manual for the Double 108 Mbps Wireless Firewall Router WGU624

Glossary

9

M-10153-01

router

A device that forwards data between networks. An IP router forwards data based on IP source and

destination addresses.

SSID

A Service Set Identification is a thirty-two character (maximum) alphanumeric key identifying a wireless

local area network. For the wireless devices in a network to communicate with each other, all devices must

be configured with the same SSID.

This is typically the configuration parameter for a wireless PC card. It corresponds to the ESSID in the

wireless Access Point and to the wireless network name.

See also

Wireless Network Name and ESSID.

Subnet Mask

A mask used to determine what subnet an IP address belongs to. Subnetting enables a network administrator

to further divide an IP address into two or more subnets.

An IP address has two components, the network address and the host address. For example, consider the IP

address 150.215.017.009. Assuming this is part of a Class B network, the first two numbers (150.215)

represent the Class B network address, and the second two numbers (017.009) identify a particular host on

this network.

Subnetting enables the network administrator to further divide the host part of the address into two or more

subnets. In this case, a part of the host address is reserved to identify the particular subnet. This is easier to

see if we show the IP address in binary format. The full address is: 10010110.11010111.00010001.00001001

The Class B network part is: 10010110.11010111

and the host address is 00010001.00001001

If this network is divided into 14 subnets, however, then the first 4 bits of the host address (0001) are

reserved for identifying the subnet.

The subnet mask is the network address plus the bits reserved for identifying the subnetwork. (By

convention, the bits for the network address are all set to 1, though it would also work if the bits were set

exactly as in the network address.) In this case, therefore, the subnet mask would be

11111111.11111111.11110000.00000000. It's called a mask because it can be used to identify the subnet to

which an IP address belongs by performing a bitwise AND operation on the mask and the IP address. The

result is the subnetwork address: Subnet Mask 255.255.240.000

11111111.11111111.11110000.00000000

IP Address 150.215.017.009

10010110.11010111.00010001.00001001

Subnet Address 150.215.016.000

10010110.11010111.00010000.00000000

The subnet address, therefore, is 150.215.016.000.

TCP/IP

The main internetworking protocols used in the Internet. The Internet Protocol (IP) used in conjunction with

the Transfer Control Protocol (TCP) form TCP/IP.

TLS

Short for Transport Layer Security, TLS is a protocol that guarantees privacy and data integrity between

client/server applications communicating over the Internet.

Reference Manual for the Double 108 Mbps Wireless Firewall Router WGU624

10

Glossary

M-10153-01

The TLS protocol is made up of two layers. The TLS Record Protocol ensures that a connection is private by

using symmetric data encryption and ensures that the connection is reliable. The second TLS layer is the

TLS Handshake Protocol, which allows authentication between the server and client and the negotiation of

an encryption algorithm and cryptographic keys before data is transmitted or received. Based on Netscape’s

SSL 3.0, TLS supercedes and is an extension of SSL. TLS and SSL are not interoperable.

Universal Plug and Play

UPnP. A networking architecture that provides compatibility among networking technology. UPnP

compliant routers provide broadband users at home and small businesses with a seamless way to participate

in online games, videoconferencing and other peer-to-peer services.

UTP

Unshielded twisted pair is the cable used by 10BASE-T and 100BASE-Tx Ethernet networks.

VCI

Virtual Channel Identifier. Together with the VPI, defines a Virtual Channel through an ATM network. Used

by ATM switching equipment to route data through the network.

VPI

Virtual Path Identifier. Together with the VCI, defines a Virtual Channel through an ATM network. Used by

ATM switching equipment to route data through the network.

VPN

Virtual Private Network. A method for securely transporting data between two private networks by using a

public network such as the Internet as a connection.

WAN

A long distance link used to extend or connect remotely located local area networks. The Internet is a large

WAN.

WEB Proxy Server

A Web proxy server is a specialized HTTP server that allows clients access to the Internet from behind a

firewall.

The proxy server listens for requests from clients within the firewall and forwards these requests to remote

Internet servers outside the firewall. The proxy server reads responses from the external servers and then

sends them to internal client clients.

WEP

Wired Equivalent Privacy is a data encryption protocol for 802.11b wireless networks.

All wireless nodes and access points on the network are configured with a 64-bit or 128-bit Shared Key for

data encryption.

Reference Manual for the Double 108 Mbps Wireless Firewall Router WGU624

Glossary

11

M-10153-01

wide area network

WAN. A long distance link used to extend or connect remotely located local area networks. The Internet is a

large WAN.

Wi-Fi

A trade name for the 802.11b wireless networking standard, given by the Wireless Ethernet Compatibility

Alliance (WECA, see http://www.wi-fi.net), an industry standards group promoting interoperability among

802.11b devices.

Windows Internet Naming Service

WINS. Windows Internet Naming Service is a server process for resolving Windows-based computer names

to IP addresses.

If a remote network contains a WINS server, your Windows PCs can gather information from that WINS

server about its local hosts. This allows your PCs to browse that remote network using the Windows

Network Neighborhood feature.

WINS

WINS. Windows Internet Naming Service is a server process for resolving Windows-based computer names

to IP addresses.

Wireless Network Name (SSID)

Wireless Network Name (SSID) is the name assigned to a wireless network. This is the same as the SSID or

ESSID configuration parameter.

Reference Manual for the Double 108 Mbps Wireless Firewall Router WGU624

12

Glossary

M-10153-01

Index

1

Numerics

64 or 128 bit WEP

4-11

802.11b

D-1

A

Account Name

3-10, 6-2

Address Resolution Protocol

B-9

ad-hoc mode

D-2

Authentication Server

3-15

Auto MDI/MDI-X

B-15, G-2

Auto Uplink

2-4, B-15, G-2

B

backup configuration

6-7

Basic Wireless Connectivity

4-14

BSSID

D-2

C

Cabling

B-11

Cat5 cable

3-1, B-12, G-2

configuration

automatic by DHCP

2-5

backup

6-7

erasing

6-8

restore

6-7

router, initial

3-1

content filtering

2-3, 5-1

conventions

typography

1-1

crossover cable

2-4, 8-2, B-14, B-15, G-2

customer support

1-4

D

date and time

8-7

Daylight Savings Time

8-8

Denial of Service (DoS) protection

2-3

denial of service attack

B-11

DHCP

B-10

DHCP Client ID

C-16

DMZ

2-4, 7-3

DMZ Server

7-7

DNS Proxy

2-5

DNS server

C-20

DNS, dynamic

7-12

documentation updates

3-8, 6-6

domain

C-20

Domain Name

3-10

domain name server (DNS)

B-10

DoS attack

B-11

Dynamic DNS

7-12

E

End Port

7-4, 7-6

EnterNet

C-18

erase configuration

6-8

ESSID

4-14, D-2

Ethernet

2-4

Ethernet cable

B-11

F

factory settings, restoring

6-8

firewall features

2-3

Flash memory, for firmware upgrade

2-2

Index