Basic Wireless Technology

PowerPoint Presentation: 

By: Kenny Elmer S. Abragan Wireless Technology

PowerPoint Presentation: 

Getting to know the basic foundation of Wireless Technology Objectives: What is WiFi ? Wireless Security 7 6 5 4 3 2 1 Wireless Range and Speed How do I connect to the Internet wirelessly? Wired VS Wireless Wireless Securities What are the standards for Wireless Local Area Network? Devices Needed

PowerPoint Presentation: 

Wi-Fi is an abbreviation for Wireless Fidelity and a catch all phrase for the several different standards and recommendations that comprise wireless networking . Getting to know WiFi What is WiFi ? "Wi-Fi" is a trademark of the Wi-Fi Alliance and the brand name for products using the IEEE 802.11 family of standards. Only Wi-Fi products that complete Wi-Fi Alliance interoperability certification testing successfully may use the "Wi-Fi CERTIFIED" designation and trademark

PowerPoint Presentation: 

What are the standards for Wireless Local Area Network? 5 GHz 802.11b ( Sept ember 1999 ) 2.4 GHz 1 1 2 3 IEEE 802.11 802.11g ( June 2003 ) 802.11n ( October 2009 ) 2 802.11a ( Sept ember 1999 ) 802.11n ( October 2009 )

PowerPoint Presentation: 

2.4 GHz / 11Mbp/s IEEE 802.11b 802.11b The Standard 802.11b has a maximum raw data rate of 11 Mbit/s and uses the same media access method defined in the original standard. 802.11b products appeared on the market in early 2000, since 802.11b is a direct extension of the modulation technique defined in the original standard. The dramatic increase in throughput of 802.11b (compared to the original standard) along with simultaneous substantial price reductions led to the rapid acceptance of 802.11b as the definitive wireless LAN technology. 802.11b devices suffer interference from other products operating in the 2.4 GHz band. Devices operating in the 2.4 GHz range include: microwave ovens, Bluetooth devices, baby monitors, and cordless telephones. 1

PowerPoint Presentation: 

2.4 GHz / 54Mbp/s IEEE 802.11g 802.11g The Standard 802.11g this works in the 2.4 GHz band (like 802.11b), but uses the same OFDM based transmission scheme as 802.11a. It operates at a maximum bit rate of 54 Mbit /s. 802.11g hardware is fully backwards compatible with 802.11b. 802.11g standard was rapidly adopted by consumers starting in January 2003, well before ratification, due to the desire for higher data rates as well as to reductions in manufacturing costs. By summer 2003, most dual-band 802.11a/b products became dual-band/tri-mode, supporting a and b/g in a single mobile adapter or access point. Like 802.11b, 802.11g devices suffer interference from other products operating in the 2.4 GHz band, for example cordless phones. 1

PowerPoint Presentation: 

5 GHz / 54Mbp/s IEEE 802.11a 802.11a The Standard 802.11a It operates in the 5 GHz band with a maximum net data rate of 54 Mbit /s, which yields realistic net achievable throughput in the mid-20 Mbit /s. Since the 2.4 GHz band is heavily used to the point of being crowded, using the relatively unused 5 GHz band gives 802.11a a significant advantage. However, this high carrier frequency also brings a disadvantage: the effective overall range of 802.11a is less than that of 802.11b/g. In theory, 802.11a signals are absorbed more readily by walls and other solid objects in their path due to their smaller wavelength and, as a result, cannot penetrate as far as those of 802.11b. In practice, 802.11b typically has a higher range at low speeds (802.11b will reduce speed to 5 Mbit /s or even 1 Mbit /s at low signal strengths). 802.11a too suffers from interference, but locally there may be fewer signals to interfere with, resulting in less interference and better throughput. 1

PowerPoint Presentation: 

2.4 GHz & 5 GHz / 54 – 600 Mbp /s IEEE 802.11n 802.11n The Standard IEEE 802.11n-2009 is an amendment to the IEEE 802.11-2007 wireless networking standard to improve network throughput over the two previous standards 802.11a and 802.11g. With a significant increase in the maximum net data rate from 54 Mbit /s to 600 Mbit /s (slightly higher gross bit rate and slightly lower maximum throughput) with the use of four spatial streams at a channel width of 40 MHz. 802.11n standardized support for multiple-input multiple-output and frame aggregation, and security improvements, among other features. 1

PowerPoint Presentation: 

2.4 GHz (14 Channels) The Frequency Advantages Range coverage Convenient / Flexible Disadvantages Prone to wireless interference Less wireless speed

PowerPoint Presentation: 

5 GHz (23 Channels) The Frequency Advantages Higher wireless speed Less wireless interference Disadvantages Less range coverage Device limitations

Wireless Range and Speed: 

Wireless Range and Speed

PowerPoint Presentation: 

Wired Equivalent Privacy ( WEP ) is a weak security algorithm for IEEE 802.11 wireless networks. Introduced as part of the original 802.11 standard ratified in September 1999, its intention was to provide data confidentiality comparable to that of a traditional wired network. WEP, recognizable by the key of 10 or 26 hexadecimal digits, is widely in use and is often the first security choice presented to users by router configuration tools. WPA protocol implements the much of the IEEE 802.11i standard. Specifically, the Temporal Key Integrity Protocol (TKIP) , was adopted for WPA. WEP used a 40-bit or 128-bit encryption key that must be manually entered on wireless access points and devices and does not change. TKIP employs a per-packet key, meaning that it dynamically generates a new 128-bit key for each packet and thus prevents the types of attacks that compromised WEP. WPA2 has replaced WPA. WPA2, which requires testing and certification by the Wi-Fi Alliance, implements the mandatory elements of IEEE 802.11i. In particular, it introduces a new AES (Advanced Encryption Standard)-based encryption mode with strong security. Certification began in September, 2004; from March 13, 2006, WPA2 certification is mandatory for all new devices to bear the Wi-Fi trademark. Wireless Securities WEP WPA2-PSK WPA-PSK Wi-Fi Protected Access ( WPA ) and Wi-Fi Protected Access II ( WPA2 ) are two security protocols and security certification programs developed by the Wi-Fi Alliance to secure wireless computer networks. The Alliance defined these in response to serious weaknesses researchers had found in the previous system, WEP (Wired Equivalent Privacy).

PowerPoint Presentation: 

Wired Technology Wired vs. Wireless Wired technology has been around for ages. It first became popular in the early 1900's with the introduction of the telephone network. The use of wired connections spawned the creation of other technologies like multiplexing and SONET Remember that using physical wires means that electronic signals are being transmitted over a metal conductor. Currently, this is the most reliable way to transmitting/receiving data or voice on the planet. The Internet itself, transmits a large amount of data through fiber optic cabling but also employs a large amount of T1/T3 lines that run over standard copper wiring. For purposes of this article, "wired" refers to copper wiring and does not include fiber optic technologies. The table below portrays the pros and cons of wired technology. Pro's Con's Reliable - Not affected by other wireless signals (portable/cellular phones, microwaves, etc) Affected by moisture and other weather conditions Price (wire is cheap!) Can be affected by noise generated by machinery and magnetics High Life Expectancy Length of wire runs limited High Speed QoS (Quality of Service)

PowerPoint Presentation: 

Wireless Technology Wired vs. Wireless Wireless isn't really a new technology. Wireless signals were fist used in transmitting AM and FM to television and radios in the early 1950's. The military has been using "line of sight" micro-wave towers for decades. Everyone knows the most common wireless technology: cellular phones. However, this technology has several problems. The table below portrays the pros and cons of wireless technology. Pro's Con's Convenient Un-reliable - affected by other wireless signals (portable/cellular phones, microwaves, etc) Range Price High Life Expectancy Signals can be easily intercepted Speeds are much slower than wired QoS (Quality of Service)

PowerPoint Presentation: 

How do I connect to the Internet wirelessly? Basic WLAN Setup / Single Access Point Basic WLAN Setup / Multiple Access Point

Devices Needed: 

Devices Needed

PowerPoint Presentation: 

THANK YOU! Your Logo