Chapter 7 - Wireless Technologies

What are the three types of wireless authentication methods?

1. open authentication, 2. PSK, 3. EAP

What ranges can be used with very few restrictions?

900 MHz, 2.4 GHZ, 5 GHz

What is open authentication?

All clients are able to associate

What is a passphrase?

An easy way to remember the word or phrase to automatically generate a key

What is an increase in signal strength from an antenna known as?

gain

What do wireless technologies use to carry information between devices?

Electromagnetic waves

Where is the operating system on most integrated routers stored?

In firmware

What is the mode of wireless communication most often used in the home and business environment?

Infrastructure

Why should you change the default settings?

So that attackers cannot identify and infiltrate the network

Is it possible for wireless utility software and Windows XP client software to manage the wireless connection at the same time?

YES or NO

If MAC address filtering and authentication are enabled, which occurs first?

authentication

What are some of the more basic security measures?

1. change default values for the SSID, 2. disable broadcast SSID, 3. configure MAC address filtering

What are the current standards for the WLAN environment?

802.11a, 802.11b, 802.11g, 802.11n

What is an ACK (acknowledgement)?

A transmission control character that confirms a transmitted message was received uncorrupted or without errors or that the receiving station is ready to accept transmissions

How are antenna classified?

According to the way they radiate the signal

Who receives the ACK?

All devices within the BSS

What is the difference between a directional antenna and an omni-directional antenna?

Directional antenna concentrate signal strength in one direction; omni-directional emit equally in all directions

What is the main organization responsible for the creation of wireless technical standards?

IEEE

Why is WPA considered more secure than WEP?

It is more difficult to crack

What is an Extended Service Set (ESS)?

Multiple access points in separate BSS

What is basic management software that can control most wireless client configurations?

Windows XP wireless client software

What happens if the MAC address is not located in the database?

The device will not be allowed to connect to or communicate across the wireless network

What is the most common form of authentication?

The use of a username and password

What is MAC address filtering?

Using the MAC address to identify which devices are allowed to connect to the wireless network

What organization is responsible for testing wireless LAN devices from different manufacturers?

WI-FI Alliance

What is the smallest wireless network, which is used to connect various peripheral devices?

WPAN

What is a case-sensitive, alpha-numeric string that can be up to 32 characters?

SSID

What do antennas do?

1. increase output signal strength from a wireless device, 2. receives wireless signals from other devices

In order to allow movement between the cells without the loss of signal, how much must BSS's overlap?

10%

What IEEE standard governs the WLAN environment?

802.11

What is a CTS (Clear to Send)?

A message indicating that the device may transmit on the channel

What are the two basic forms of WLAN installations?

Ad hoc, Infrastructure mode

What is the simplest form of a wireless network?

Ad-hoc

What is WEP (Wired Equivalency Protocol)?

An advanced security feature that encrypts network traffic as it travels through the air

What is the smallest building block of a WLAN?

BSS

When should basic configuration tasks be conducted?

Before the access point is connected to a live network

What does Wireless technology use to avoid collisions?

CSMA/CA - Carrier Sense Multiple access with Collision Avoidance

What is a good example of a WWAN?

Cell phone network

How is an ad-hoc network created?

Connecting two or more wireless clients together in a peer-to-peer network

What does a successful ping tell you?

Data transmission is possible

What two techniques have been developed to help secure wireless transmissions?

Encryption and authentication

What do wireless standards ensure?

Specify the RF spectrum used, data rates, and how the information is transmitted

Which wavelength is relatively low energy and cannot penetrate through walls or other obstacles?

IR

What are the ranges with the fewest restrictions called?

Industrial, Scientific, and Medical (ISM)

What are the most common wave lengths used for public wireless communication?

Infrared (IR), Radio Frequency (RF)

What is a benefit of a larger BBS?

Less equipment and a lower cost of implementation

What must adjacent BSSs use in order to optimize throughput?

Non-overlapping channels

What does an access point do?

Provides a connection between wireless hosts and hosts on an Ethernet wired network

What is one of the main advantages of wireless technology?

The ability to provide anytime, anywhere connectivity

What is authentication?

The process of permitting entry to a network based on a set of credentials

What is encryption?

The process of transferring data so that even if it is intercepted, it is unusable

What does the type of mode enabled on the access point depend on?

The type of host connecting to it

How are the conversations between sender and receiver controlled?

Through channels

What is the SSID used for?

To tell wireless devices which LAN they belong to and with which other devices they can communicate

How can you make the network non-public?

Turn off the SSID broadcast feature

What is EAP (Extensible Authentication Protocol)?

Two-way authentication as well as user authentication

Which antenna type can achieve greater transmission distances?

directional

What is the process of updating firmware on an integrated router?

1. determine the version of the currently installed firmware, 2. download the updated version for the firmware, 3. select firmware upgrade feature in GUI

What are the limitations of wireless LAN technology?

1. interference 2. network and data security 3. technology

What are the benefits of wireless LAN technology?

1. mobility 2.scalability 3.flexibility 4.cost savings 5. reduce installation time 6. reliability in harsh enviroments

What are the two ways to restore factory defaults?

1. select restore factory defaults from appropriate menu, 2. press and hold the reset button for 30 seconds

What things should be included when planning a network installation?

1. the type of wireless standard to be used, 2. the most efficient layout of devices, 3. an installation and security plan, 4. a strategy for backing up and updating the firmware for the wireless device

How big is the WEP key?

64 or 128 bits

Which wireless standard supports a larger BBS?

802.11 b/g/n

What is a STA?

A wireless client/station

What controls all communications and ensures that all STAs have equal access to the media on infrastructure mode?

Access Point

What is a wireless host?

Any device that contains a wireless NIC and wireless client software

What is the best way to learn end- user requirements?

Ask questions

What are the most common factors to consider when determining which WLAN standards to use?

Bandwidth requirements, coverage areas, existing implementation, and cost

What is the area covered by a single access point known as?

Basic Service Set (BSS)

What is traffic filtering?

Blocks undesirable traffic from entering or leaving the wireless network

What technologies does the WWAN use?

Code Division Multiple Access (CDMA) or Global System for Mobile Communications (GSM)

What is one way to limit access to your wireless network?

Control exactly which devices can gain access to your network

What is one of the primary benefits of wireless networking?

Ease and convenience of connecting devices

If the update process is interrupted before completion, what happens to the drive?

It may become inoperable

What feature displays the current signal strength and quality of the wireless signal?

Link information

What are some of the features available with stand-alone wireless utility software?

Link information, profiles, site survey

What happens if you select mixed mode?

Network performance will decrease

What has made Bluetooth technology the preferred method for connection computer peripherals?

One-to-many communications

What is PSK (pre-shared key) authentication?

One-way authentication both the access point and client must be configured with the same key or secret work

What is one of the most common tests for verifying successful data transmission?

Ping

Which wavelength has the greatest range?

RF

How do you ensure that wireless components connect to the appropriate WLAN?

SSID - Service Set Identifier

What does the Wi-Fi logo on a device mean?

The equipment meets standards and should interoperate with other devices of the same standard

What is a hotspot?

The implementation of wireless in public locations

What is Total Cost of Ownership (TCO)?

The purchase of the equipment as well as installation and support cots

What is one easy way to gain entry to a wireless network?

Through the network name or SSID

How is WPA (Wi-Fi Protected Access) different than WEP?

WPA generates a new, dynamic key each time a client establishes a connection with the access point

What are the three major categories of wireless networks?

WPAN - Wireless Personal Area Network, WLAN - Wireless Local Area Network, WWAN - Wireless Wide Area Network