Cisco.Press.CCIE.Wireless.Exam.350-050.Quick.Reference.Apr.2012.eBook-DDU.pdf

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From the Library of mike summers
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Table of Contents
Chapter 1
Planning and Designing
Chapter 2
Configure and Troubleshoot
L2/L3 Network Infrastructure
CCIE Wireless
Exam (350-050)
Quick Reference
Chapter 3
Configure and Troubleshoot
Chapter 4
Configure and Troubleshoot
Chapter 5
Configure and Troubleshoot the Cisco
Roger Nobel
Fabian Riesen
Federico Ziliotto
Federico Lovison
Erik Vangrunderbeek
Chapter 7
Configure and Troubleshoot WLAN
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CCIE Wireless Exam (350-050) Quick Reference
About the Authors
Roger Nobel is a customer support engineer at the Cisco Systems Technical Assistance Center (TAC) in Switzerland. He joined
Cisco in 2000 as a project engineer. He owns a Swiss-Engineer degree from the University of Applied Sciences Winterthur/
Zurich with specialization in software engineering and transmission technologies. He holds CCIE Wireless (#23679), CWNA,
and CWSP (#400138).
Fabian Riesen is technical leader at the Cisco Systems Technical Assistance Center (TAC) in Switzerland. He joined Cisco in
1999 as a project engineer. He owns a Swiss-Engineer degree from the University of Applied Sciences Winterthur/Zurich with
specialization in software engineering and transmission technologies. He holds CCIE ISP-Dial and CCIE Wireless (#6268).
Fabian was a reviewer for the Cisco Press book Deploying and Troubleshooting Cisco Wireless LAN Controllers and is the au-
thor of one of the CCIE Wireless Written and Lab examinations.
Federico Ziliotto joined Cisco in 2007 as a customer support engineer (CSE) at the Technical Assistance Center (TAC) in
Belgium, where he specialized in solving high severity issues for worldwide customers with particular focus on wireless net-
works, network admission control (NAC) setups, identity-based networking (IBN), and 802.1X, AAA solutions, and Cisco
TrustSec. Federico owns an engineering degree from the University of Padova, Italy, with specialization in telecommunications.
He is double CCIE #23280 in Wireless since January 2009 and Routing & Switching since April 2011. In June 2011 he moved
to a new position as systems engineer in Cisco France, in the Solution and Technology Practice (STEP) team, where he cur-
rently collaborates with the pre-sales teams in security- and mobility-related projects.
Federico Lovison is a customer support engineer at the Cisco Systems Technical Assistance Center (TAC) in Belgium. He
joined Cisco in 2007 as a CSE. He owns an engineering degree from the University of Padova with specialization in telecom-
munications. He holds CCIE Wireless (#23307).
Erik Vangrunderbeek is CCIE wireless product manager within Learning@Cisco. Based out of Brussels, Belgium, he is re-
sponsible for the exam design and content development process for both the CCIE Wireless written and lab exams. Erik joined
Cisco in 1999 and holds CCIE #9145.
 
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CCIE Wireless Exam (350-050) Quick Reference
Chapter 1
Wireless Technologies
Wireless Introduction
To Be Wireless
With the introduction of wireless LAN (WLAN), IP networks are now also available for those applications on which wired
technologies are not suitable or no wired connectivity is available at all. The following are a few wireless use cases:
■
Home ISP connectivity: Consumer products
■
Building-to-building connectivity: Point-to-point and multipoint
■
“Last mile” ISP connectivity: Rural Internet access
■
Mobility applications: Car rental returns and parcel deliveries
■
Enterprise network extension: Reduce, move, add, and change/mobile offi ce environment
Although WLAN appears to be “just another LAN type/protocol,” the nature of wireless is to be a shared medium, and shared not
only between a certain workgroup but also shared across the walls, across the building, and with your neighbor. On top of normal
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Chapter 1: Planning and Designing 802.11 Wireless Technologies
Layer 1: Radio Frequencies
Radio frequencies are high-frequency, alternating current (AC) signals that are radiated into the air through an antenna, creating
radio waves. Radio waves propagate away from the antenna in a straight line in all directions at once, just like light rays from a bulb.
More light bulbs spread around the room will provide better overall lighting. This translates into a stronger average signal for mobile
clients. When radio waves hit a wall, door, or any obstruction, there is attenuation of the signal, which weakens the signal and can
reduce throughput. The signal can also be refl ected or refracted.
Industrial, Scientifi c, and Medical (ISM) Radio Bands
WLAN devices work in a frequency range (wavebands) that belongs to the industrial, scientifi c, and medical (ISM) radio bands.
The ISM band was originally reserved internationally for the use of RF electromagnetic fi elds for industrial, scientifi c, and medical
purposes other than communications. In general, communications equipment must accept any interference generated by ISM
equipment.
Within the ISM band, WLAN devices use wavebands as follows:
■
Bluetooth 2450-MHz band
■
HIPERLAN 5800-MHz band
■
IEEE 802.11/WiFi 2450-MHz and 5800-MHz bands
Cisco WLAN technologies use the IEEE 802.11 range, which is what this book focuses on.
 
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