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Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
D-8
Wireless Networking Basics
M-10153-01
The radio frequency channels used are listed in
Table 7-1
:
Note:
The available channels supported by the wireless products in various countries are different.
The preferred channel separation between the channels in neighboring wireless networks is 25
MHz (5 channels). This means that you can apply up to three different channels within your
wireless network. There are only 11 usable wireless channels in the United States. It is
recommended that you start using channel 1 and grow to use channel 6, and 11 when necessary, as
these three channels do not overlap.
Table 7-1.
802.11 Radio Frequency Channels
Channel
Center Frequency
Frequency Spread
1
2412 MHz
2399.5 MHz - 2424.5 MHz
2
2417 MHz
2404.5 MHz - 2429.5 MHz
3
2422 MHz
2409.5 MHz - 2434.5 MHz
4
2427 MHz
2414.5 MHz - 2439.5 MHz
5
2432 MHz
2419.5 MHz - 2444.5 MHz
6
2437 MHz
2424.5 MHz - 2449.5 MHz
7
2442 MHz
2429.5 MHz - 2454.5 MHz
8
2447 MHz
2434.5 MHz - 2459.5 MHz
9
2452 MHz
2439.5 MHz - 2464.5 MHz
10
2457 MHz
2444.5 MHz - 2469.5 MHz
11
2462 MHz
2449.5 MHz - 2474.5 MHz
12
2467 MHz
2454.5 MHz - 2479.5 MHz
13
2472 MHz
2459.5 MHz - 2484.5 MHz
Page 137 / 152
M-10153-01
Glossary
1
Glossary
Use the list below to find definitions for technical terms used in this manual.
List of Glossary Terms
10BASE-T
IEEE 802.3 specification for 10 Mbps Ethernet over twisted pair wiring.
100BASE-Tx
IEEE 802.3 specification for 100 Mbps Ethernet over twisted pair wiring.
3DES
3DES (Triple DES) achieves a high level of security by encrypting the data three times using DES with three
different, unrelated keys.
802.1x
802.1x defines port-based, network access control used to provide authenticated network access and
automated data encryption key management.
The IEEE 802.1x draft standard offers an effective framework for authenticating and controlling user traffic
to a protected network, as well as dynamically varying encryption keys. 802.1x uses a protocol called EAP
(Extensible Authentication Protocol) and supports multiple authentication methods, such as token cards,
Kerberos, one-time passwords, certificates, and public key authentication. For details on EAP specifically,
refer to IETF's RFC 2284.
802.11a
IEEE specification for wireless networking at 54 Mbps operating in unlicensed radio bands over 5 GHz.
802.11b
IEEE specification for wireless networking at 11 Mbps using direct-sequence spread-spectrum (DSSS)
technology and operating in the unlicensed radio spectrum at 2.5 GHz.
802.11g
A soon to be ratified IEEE specification for wireless networking at 54 Mbps using direct-sequence
spread-spectrum (DSSS) technology and operating in the unlicensed radio spectrum at 2.5 GHz. 802.11g is
backwards compatible with 802.11b.
Page 138 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
2
Glossary
M-10153-01
ADSL
Short for asymmetric digital subscriber line, a technology that allows data to be sent over existing copper
telephone lines at data rates of from 1.5 to 9 Mbps when receiving data (known as the downstream rate) and
from 16 to 640 Kbps when sending data (known as the upstream rate).
ADSL requires a special ADSL modem. ADSL is growing in popularity as more areas around the world
gain access.
AES
Advanced Encryption Standard, a symmetric 128-bit block data encryption technique.
It is an iterated block cipher with a variable block length and a variable key length. The block length and the
key length can be independently specified to 128, 192 or 256 bits.The U.S government adopted the
algorithm as its encryption technique in October 2000, replacing the DES encryption it used. AES works at
multiple network layers simultaneously.
AH
Authentication Header.
ARP
Address Resolution Protocol, a TCP/IP protocol used to convert an IP address into a physical address (called
a DLC address), such as an Ethernet address.
A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network. The host
on the network that has the IP address in the request then replies with its physical hardware address. There is
also Reverse ARP (RARP) which can be used by a host to discover its IP address. In this case, the host
broadcasts its physical address and a RARP server replies with the host's IP address.
Auto Uplink
Auto Uplink
TM
technology (also called MDI/MDIX) eliminates the need to worry about crossover vs.
straight-through Ethernet cables. Auto Uplink
TM
will accommodate either type of cable to make the right
connection.
CA
A Certificate Authority is a trusted third-party organization or company that issues digital certificates used
to create digital signatures and public-private key pairs.
Cat 5
Category 5
unshielded twisted pair (UTP) cabling. An Ethernet network operating at 10 Mbits/second
(10BASE-T) will often tolerate low quality cables, but at 100 Mbits/second (10BASE-Tx) the cable must be
rated as Category 5, or Cat 5 or Cat V, by the Electronic Industry Association (EIA).
This rating will be printed on the cable jacket. Cat 5 cable contains eight conductors, arranged in four
twisted pairs, and terminated with an RJ45 type connector. In addition, there are restrictions on maximum
cable length for both 10 and 100 Mbits/second networks.
Certificate Authority
Page 139 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
Glossary
3
M-10153-01
A Certificate Authority is a trusted third-party organization or company that issues digital certificates used
to create digital signatures and public-private key pairs.
The role of the CA in this process is to guarantee that the individual granted the unique certificate is, in fact,
who he or she claims to be. Usually, this means that the CA has an arrangement with a financial institution,
such as a credit card company, which provides it with information to confirm an individual's claimed
identity. CAs are a critical component in data security and electronic
commerce because they guarantee that
the two parties exchanging information are really who they claim to be.
CRL
Certificate Revocation List. Each Certificate Authority (CA) maintains a revoked certificates list.
Denial of Service attack
DoS. A hacker attack designed to prevent your computer or network from operating or communicating.
DHCP
An Ethernet protocol specifying how a centralized DHCP server can assign network configuration
information to multiple DHCP clients. The assigned information includes IP addresses, DNS addresses, and
gateway (router) addresses.
DMZ
A Demilitarized Zone is used by a company that wants to host its own Internet services without sacrificing
unauthorized access to its private network.
The DMZ sits between the Internet and an internal network's line of defense, usually some combination of
firewalls and bastion hosts. Typically, the DMZ contains devices accessible to Internet traffic, such as web
(HTTP) servers, FTP servers, SMTP (e-mail) servers and DNS servers.
DNS
Short for Domain Name System (or Service), an Internet service that translates domain names into IP
addresses.
Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on
IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the
corresponding IP address. For example, the domain name www.example.com might translate to
198.105.232.4. The DNS system is, in fact, its own network. If one DNS server doesn't know how to
translate a particular domain name, it asks another one, and so on, until the correct IP address is returned.
Domain Name
A descriptive name for an address or group of addresses on the Internet. Domain names are of the form of a
registered entity name plus one of a number of predefined top level suffixes such as .com, .edu, .uk, etc. For
example, in the address mail.NETGEAR.com, mail is a server name and NETGEAR.com is the domain.
DoS
A hacker attack designed to prevent your computer or network from operating or communicating.
Page 140 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
4
Glossary
M-10153-01
DSL
Short for digital subscriber line, but is commonly used in reference to the asymmetric version of this
technology (ADSL) that allows data to be sent over existing copper telephone lines at data rates of from 1.5
to 9 Mbps when receiving data (known as the downstream rate) and from 16 to 640 Kbps when sending data
(known as the upstream rate).
ADSL requires a special ADSL modem. ADSL is growing in popularity as more areas around the world
gain access.
DSLAM
DSL Access Multiplexor. The piece of equipment at the telephone company central office that provides the
ADSL signal.
Dynamic Host Configuration Protocol
DHCP. An Ethernet protocol specifying how a centralized DHCP server can assign network configuration
information to multiple DHCP clients. The assigned information includes IP addresses, DNS addresses, and
gateway (router) addresses.
EAP
Extensible Authentication Protocol is a general protocol for authentication that supports multiple
authentication methods.
EAP, an extension to PPP, supports such authentication methods as token cards, Kerberos, one-time
passwords, certificates, public key authentication and smart cards. In wireless communications using EAP, a
user requests connection to a WLAN through an AP, which then requests the identity of the user and
transmits that identity to an authentication server such as RADIUS. The server asks the AP for proof of
identity, which the AP gets from the user and then sends back to the server to complete the authentication.
EAP is defined by RFC 2284.
ESP
Encapsulating Security Payload.
ESSID
The Extended Service Set Identification (ESSID) is a thirty-two character (maximum) alphanumeric key
identifying the wireless local area network.
Gateway
A local device, usually a router, that connects hosts on a local network to other networks.
IETF
Internet Engineering Task Force. Working groups of the IETF propose standard protocols and procedures for
the Internet, which are published as RFCs (Request for Comment) at
www.ietf.org
.
An open international community of network designers, operators, vendors, and researchers concerned with
the evolution of the Internet architecture and the smooth operation of the Internet.

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