Wireless Networking Wireless Devices Module-4B

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Wireless NetworkingWireless Devices Module-4B

• Jerry Bernardini
• Community College of Rhode Island

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Presentation Reference Material

• CWNA Certified Wireless Network Administration
  Official Study Guide
• (PWO-104), David Coleman, David Westcott,
  2009, Chapter-10

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WLAN Client Devices

• PC Cards
• ExpressCard
• CardBus
• PCMCIA
• Some support external antennas
• USB devices
• External cable
• Variable position and antenna
• Compact Flash Devices
• SD Devices
• PCI Cards
• Mini-PCI Cards
• Laptop applications

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Cisco Aironet 802.11b Client Adapters

• 2.4 GHz
• 802.11b
• 11 Mbps
• Include
• PC Card
• PCI Card
• LMC Card
• Mini PCI

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Cisco Aironet 350 Series Mini PCI

• 2.4 GHz/802.11b embedded wireless for notebooks
• 100 mW transmit power
• Must order through PC manufactures (not orderable
  directly through Cisco)

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Cisco Aironet 802.11a Client Adapter

• 5 GHz/802.11a
• 54 Mbps
• Rate Shifting
• 6, 9, 12, 18, 24, 36, 48, or 54
• Fixed data rates
• User configurable option
• 5 dBi Patch Antenna
• CardBus interface
• Transmit power settings
• 20 mW, 10 mW, and 5 mW

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PCMCIA, (PC) Cards
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Compact Flash

• Compact Flash, (CF) - CompactFlash Association,
  CFA

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CF Wireless 802.11b (WiFi)
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Wireless USB Adapters
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PCI and ISA Adapters
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Adapters
SD to USB
SD to PC
CF to PC
USB to Serial
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Ethernet Adapters
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Access Points

• The Access Point (AP) is the device that
  provides access to the WLAN
• Each BSS has one AP and multiple Aps make an ESS
• Two categories of APs are Fat and Thin Access
  Points
• Thin APs are paired with a wireless LAN switch
  or controller to offer additional functionality
  and centralization over Fat APs.
• Fat (Thick or Smart) APs are "fat" because they
  operate autonomously as members of a
  decentralized WLAN.

3Com Wireless LAN Switch WX1200
3Com AP3750 MAP
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Autonomous or FAT Access Points

• Traditional wireless LANs use decentralized Fat
  access points
• Manual configuration required to set the power
  level, channel, security and other configurable
  parameters.
• Each access point is individually configured
• Third party software solutions are often needed
  for additional security and management
  capabilities
• For large networks which quickly add to the
  total cost of ownership.

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Autonomous AP Implementation
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Lightweight or Thin Access Points

• Centralized WLANs use a wireless controller to
  manage, process, and configure the RF environment
  
• Centralized WLANs use called thin or lightweight
  APs
• Aps communicate directly with the central
  controller with the wired network
• All the functionality and intelligence is
  offloaded to the controller
• This provides a single point of administration
  for various policies relating to security,
  intrusion detection, user roles, and software
  upgrades..

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Thin Access Points Implementation
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Access Points Market
Belkin APs
Buffalo APs
Linksys APs
Cisco APs
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Access Point Features

• Support of various IEEE 802.11 standards
• FHSS, DSSS, OFDM, 802.11a,b, g, n
• Support for various security standards
• IEEE 802.11i, WEP, WPA, WPA2, PSK, RADIUS
• Support for QoS extensions
• Wireless Multimedia (WMM), VoWLAN
• Fixed or Detachable Antenna
• Omni-directional, Directional
• Filtering
• MAC, Protocol
• Variable Power
• Percent of Max or Actual Levels

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Power Over Ethernet (PoE) Support

• Found on Enterprise and not on SOHO APs
• Primary benefit is ability to install APs where
  no AC power is present
• IEEE 802.3af standard for PoE
• PoE is supply by injectors or switches

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PoE Options and Power Source Equipment(PSE)
Active/PSE Switch
PD Access Point
Pins 4-5 Power(48v) Pins 7-8 Power
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DC Power
CAT-5e Ethernet
PD Access Point
2
Switch
AC Power
DC Power
CAT-5e Ethernet
PSE Injector
Access Point
DCPower
3
Switch
AC Power
DC Power
CAT-5e Ethernet
PSE Injector
Tap/Splitter
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Wireless Bridges

• Provides a link between two WLAN segments
• Not full described by IEEE 802.11
• Vendor dependent
• Two Modes Root and Non-root

Point-to-Point
Root
Non-Root
Non-Root
Root
Non-Root
Point-to-Mulitpoint
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WLAN Bridge Modes and Components

• Root Mode A bridge that acts as the hub to a
  group of bridges.
• Only One Root-Bridge for PtP or PtMP links
  (important for tests)
• For PtP link one Root-Bridge and one Non-Root
  Bridge
• Non-Root Mode A member bridge of a group that
  is not the Root Bridge.
• Can also function as a standard AP
• Can function as a repeater

3Com WLAN Bridge
Proxim Quick Bridge 11
Cisco Aironet 1400
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Bridge Application School District
Bode Elementary Yagi
Lincoln Elementary Yagi
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Residential WLAN Gateways

• Same as SOHO wireless routers
• Support of various IEEE 802.11 standards
• FHSS, DSSS, OFDM, 802.11a,b, g, n
• Support for various security standards
• IEEE 802.11i, WEP, WPA, WPA2, PSK, RADIUS
• Built in firewall features
• Packet and MAC Filtering
• Switched Ethernet ports
• DHCP
• NAT and PAT

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Enterprise WLAN
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Enterprise Wireless Gateways

• Enterprise Wireless Gateway is a powerful
  device that interfaces between the enterprise
  network and the corporate firewall.
• HTML ? WML
• Authentication, Filtering, and Security
• Traffic Management, QoS
• Mobile Addressing

Vernier IS 6500p
BlueSecure ControllerBSC 2100
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Enterprise Wireless Gateways
Enterprise Server
Enterprise Gateway
Router
Switch
Access Points
Wireless Clients
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Wireless Mesh Access Points

• Mesh APs associate with multiple APs
• Association between APs is limited by vendor
  (3-5)
• Currently vendor dependent
• Clients can reach destinations thru multiple APs
• APs route packets to ovoid failures and optimal
  paths
• Mesh Networks are more resilient
• Not every AP has to be connected to a wired
  network
• Self-Healing, Self-Configuring using Layer-2
  Protocol
• New standard IEEE 802.11s will allow
  interoperability between vendors

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Wireless Mesh Network Implementation
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Voice Over IP WLAN (VoWLAN)

• Telephone communication using a WLAN requires
  latency and QoS considerations
• Special equipment is required
• VoWLAN phone (phones that will connect to WLAN)
• WLAN infrastructure with QoS (low latency and
  Protocol management)
• Call management (PBX for IP phones)
• Voice gateway for outside calls
• IP phones associate with APs rather than cellular
  towers

Linksys
Siemens