Transcript Explain the Components and Operations of Basic Wireless

Wireless technologies
LAN Switching and Wireless – Chapter 7 and Fundamentals of
Wireless LANs course basics
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Objectives

Describe the components and operations of basic
wireless LAN topologies.

Describe the components and operations of basic
wireless LAN security.

Configure and verify basic wireless LAN access.

Configure and troubleshoot wireless client access.
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What is Wireless LAN?
 Wireless LAN (WLAN) - provides all the features and
benefits of traditional LAN technologies such as Ethernet
and Token Ring, but without the limitations of wires or
cables.
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Other Wireless Technologies
 Cellular
 Bluetooth or PAN (Personal Area Network)
 3G (3rd Generation)
 UWB (Ultra Wide Band)
 FSO (Free Space Optics)
 Radio waves off meteor trails!
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WLAN evolution
Warehousing
Healthcare
Education
Businesses
Home
Speed
860 Kbps
Network
Radio
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Standards-based
Proprietary
900 MHz
2.4 GHz

1986
1988
1990
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11 Mbps 54 Mbps
1 and
1 and
2 Mbps
2 Mbps
IEEE 802.11Begins
Drafting
1992
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1994
5 GHz
2.4 GHz
1996
802.11
Ratified
802.11a,b 802.11g
Ratified
Drafted
1998
2000
2002
5
Current standards – 802.11 a/b/g
Speed
860 Kbps
Radio
900 MHz
2.4 GHz

1986
Standards-based
Proprietary
Network
1988
11 Mbps 54 Mbps
1 and
1 and
2 Mbps
2 Mbps
1990
IEEE 802.11Begins
Drafting
1992
1994
5 GHz
2.4 GHz
1996
802.11
Ratified
802.11a,b 802.11g
Ratified
Ratified
1998
2000
2003
 802.11a
Up to 54 Mbps
5 GHz
Not compatible with either 802.11b or 802.11g
 802.11b
Up to 11 Mbps
2.4 GHz
 802.11g
Up to 54 Mbps
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GHz
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802.11g is backwards compatible
with 802.11b, but with a drawback
(later)
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Physical Layer radio modulations
 802.11b (11MBit / 2.4GHz)
FHSS – Frequency Hopping Spread Spectrum
DSSS – Direct Sequence Spread Spectrum
 802.11g (54MBit / 2.4 GHz)
OFDM – Ortogonal Frequency Division Multiplexing
 802.11a (54MBit / 5 GHz)
OFDM – Ortogonal Frequency Division Multiplexing
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Explain the Components and Operations
of Basic Wireless LAN Topologies
 Describe why wireless LANs are a popular choice for
small business LAN implementations
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Explain the Components and Operations
of Basic Wireless LAN Topologies
 Describe the components of a 802.11-based wireless
infrastructure
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Wireless LANs components
 Describe the components of a 802.11-based wireless
infrastructure
In-building Infrastructure
• 1200 Series (802.11a and 802.11b)
• 1100 Series (802.11b)
• 350 Series (802.11b) not shown
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Antennas
 Describe the components of a 802.11-based wireless
infrastructure
Antenna
•2.4GHz Antennas
•5 GHz Antennas
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Cables / Accessories
 Describe the components of a 802.11-based wireless
infrastructure
Cable and Accessories
• Low Loss Cable
• Antenna Mounts
Antenna
• Lightening Arrestor
•2.4GHz Antennas
•5 GHz Antennas
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Explain the Components and Operations
of Basic Wireless LAN Topologies
Basic Service
Set Set
(BSS)
/ Infrastructure
 Extended
Independent
Service
Basic
Service
(ESS)
Set (IBSS) / Ad-hoc
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ESS roaming feature
 Describe how to plan a wireless LAN
 A WLAN designer must determine
whether clients will require seamless
roaming from access point to access point.
 Not yet standardized by IEEE 802.11
IAPP (Inter-Access Point Protocol)
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Explain the Components and Operations
of Basic Wireless LAN Security
 Describe the threats to wireless LAN security
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Explain the Components and Operations
of Basic Wireless LAN Security
 Describe the wireless protocols. The description will
include a description of 802.1x, a comparison of WPA
and WPA2 as well as comparison of TKIP and AES
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Explain the Components and Operations
of Basic Wireless LAN Security
 Describe how to secure a wireless LAN from the key
security threats
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Configure and Verify Basic Wireless LAN
Access
 Configure a wireless access point
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Configure and Verify Basic Wireless LAN
Access
 Configure a wireless NIC
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Configure and Troubleshoot Wireless
Client Access
 Describe how to solve access point firmware issues
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Configure and Troubleshoot Wireless
Client Access
 Describe how to solve authentication problems
associated with wireless LANs
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Summary
 Wireless LANs use standards such as
IEEE 802.11a
IEEE 802.11b
IEEE 802.11g
IEEE 802.11n
 Basic Service set
–Mobile clients use a single access point for connectivity
 Extended service set
–Multiple access point that share an SSID
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Summary
 WLAN security practices/methods include
–MAC address filtering
–SSID making
–Implementing WPA2
 Configuration of wireless NIC and access point
–Configure both of them the same way
•SSID
–Ensure that the latest firmware is installed
 Troubleshooting WLANs include doing the following:
–Check channel setting
–Check for interference
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Záver prezentácie
Ďakujem za pozornosť.
Moderné vzdelávanie pre vedomostnú
spoločnosť.
Projekt je spolufinancovaný zo zdrojov
EÚ.
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