QUIZ

1
QUIZ

• Antennas transmit and receive AC voltage. True
  or False
• 2400 MHz is the same frequency as 2.4 GHz. True
  or False
• The FCC regulates Universal Building Codes True
  or False
• RF stands for Radio Field True or False
• Line Loss refers to attenuation of signal in coax
  cable True or False

• 6. Which type of antenna is best to form a
  wireless bridge between two buildings 200 ft
  apart?
• Bridge antenna
• Dome antenna
• Panel antenna
• Parabolic Dish

2
QUIZ cont.

• 7.What portion of the spectrum has been in use in
  the computer world over 10 years?
• 8. How many bands in the RF spectrum?
• 9. List 3 types of antennas.

3
CH 4 5

• Quiz
• Lecture
• Lab Lecture
• Lab AP Set-up

4
CH 5Common Wireless Network Components

• 4 Basic Styles of Interfaces
• PCMCIA
• PCI
• ISA
• USB
• These are all client side devices
• Connect wired and wireless networks

5
CH 5Common Wireless Network Components

• PCMCIA
• Also known as a PC Card
• Most Laptops built since 1995 have them.
• Most popular wireless interface
• Wireless Cards have built in antennas
• Look for Intersils Prim 2 Chipset
• NetStumbler Problem
• CF cards---PDAs

6
CH 5Common Wireless Network Components
7
CH 5Common Wireless Network Components

• PCI
• For connecting desktop computers to WLAN
• Standard on all computers
• Generally slightly faster than USB
• Requires that computer case be opened
• Warranty
• Static Electricity
• Know How

8
CH 5Common Wireless Network Components
9
CH 5Common Wireless Network Components

• ISA Bus Interface
• Old
• Outdated
• You may have to connect an old computer to your
  WLAN
• I am unaware of anyone who makes a readily
  available ISA slot Wireless NIC.
• Cost
• Drivers for an old system

10
CH 5Common Wireless Network Components
11
CH 5Common Wireless Network Components

• USB---Universal Serial Bus
• Most times a better option than a PCI Card
• More PnP than other devices
• Most new computers have more USB connectors that
  PCI. (Most likely full)
• Two current versions 1.1 and 2.0
• 2.0 is faster
• NIC must be ver. 2.0 as well
• Both versions look the same

12
CH 5Common Wireless Network Components
13
CH 5Common Wireless Network Components

• Network-Side Wireless Equipment
• AP
• Bridge
• Gateways and Routers
• Plus all of the wires equipment

14
CH 5 Components Common Wireless Networks

• AP
• Do the work of a hub, bridge, gateway, router.
• Thats what the book says
• Untrue an AP is simply a hub.
• True APs dont dole out DHCP
• Pass packet traffic to wired networks
• Firmware
• Provides encryption, and SSID as well as filters.
• Modes
• 40 and 128 bit encryption
• Filters slow traffic pass

15
CH 5 Components Common Wireless Networks

• Software APs
• Run as a program on a laptop with a wireless NIC
• Hacking tool
• Man in the Middle Attack
• Mainly Linux based tools
• If you find a good Windows based AP program its
  good for a homework and daily quiz.
• You must demonstrate it for the class.

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CH 5 Components Common Wireless Networks
17
CH 5 Components Common Wireless Networks

• Bridging
• Acts as a repeater between wireless segments
• Some act as Access Points
• Some APs have Bridging mode
• Disadvantages
• Can not use external antennas that do not come
  with the unit. (Legally)
• Use only one channel to pass data
• Some company's produce multi channel bridging
  equipment.
• Orinoco now Proxim, and Cisco

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CH 5 Components Common Wireless Networks
19
CH 5 Components Common Wireless Networks

• Gateways and Routers
• Used for high speed internet Access
• Most often home application
• Usually a router, AP, and some sort of firewall
• Some even have modems or print servers built in

20
CH 5 Components Common Wireless Networks

• Power Amplifiers
• Improve range beyond external antennas
• Make sure there FCC approved
• Long runs of antenna cable will require power
  amplifiers
• Always assume your putting out the maximum power
  of the amplifier
• Safety!!!
• Refrence pages 78-82 in the book before using
  power amps.
• Know the specs of your equipment

21
CH 6Typical Wireless Installations

• Application of your WLAN will dictate equipment,
  configuration, security, access control,
  equipment location, and install procedures.
• Choose equipment wisely.
• Do research
• Know your clients

22
CH 6Typical Wireless Installations

• Home
• This is what wireless networking was designed
  for.
• Share high speed internet, file and printer
  sharing.
• One device covers it all.
• Know the home and use WEP.
• Site survey!!

23
CH 6Typical Wireless Installations

• Work
• Usually a wired infrastructure
• Most likely more than one AP
• 1 AP for every 10-15 concurrent users
• Site survey is very important in this
  environment.
• You wont get the same range out of every AP.
• Allow for overlap of coverage.
• Roaming (well kinda)
• Think about use of drop ceilings to conceal your
  equipment

24
CH 6Typical Wireless Installations

• Remember POE (power over Ethernet)
• Book says to put each AP on a different channel
• Nonoverlapping channels (1,6,11)
• This is not the way we do it
• All APs are configured exactly the same.
• Same channel, SSID, MAC Filter Lists,
• You need to have a device that assigns DHCP
• Or you can use static addressing.

25
CH 6Typical Wireless Installations

• Wireless Campus
• GET HELP
• You will need a team to design, build and
  maintain this type of set-up!!
• Connecting building via fiber or coax is very
  expensive!!
• Bridge multiple wireless LANs together.
• Be creative!!
• It can be done
• Put in place as a backup to wired!!

26
UCI
27
CH 6Typical Wireless Installations

• Community and WISP
• AKA Hotspots
• Some charge some do not
• WISP
• Mainly used for outlying areas where its to
  expensive to build wired networks.
• Wireless Internet Service Providers (WISP's) face
  unique challenges in providing "last mile"
  broadband access to their wireless customers. 
  Frequency and modulation selection, antenna
  design and placement, security, subscriber unit
  costs and network reliability all factor heavily
  when designing a large-scale wireless internet
  service network.
• You can be your own neighborhood WISP.

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MESH WISP
Wireless Mesh Networks are an exciting new
concept for creating low-cost, high-reliability
wireless metro-area networks.  In a mesh network,
each wireless node serves as both an access point
and wireless router, creating multiple pathways
for the wireless signal.  Mesh networks have no
single point of failure and can be designed to
route around line-of-sight obstacles that can
interfere with other wireless network
topologies. 
29
LAB

• Disable Wired NIC
• Install Wireless NIC
• Start-Run_Type cmd- type ipconfig /all to
  check address.
• Connect to the AP
• Surf to http//ci.san-clemente.ca.us
• Download and install NetStumbler.
• WAIT!

30
Homework

• NONE

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Quiz! Week 5

• Whats WEP?
• Whats a WEP Key?
• Whats an SSID
• Whats WISP?
• How do you tell an AP from a Router?
• Whats the longest WEP key that WI-FI certified?
• Whats a true AP
• How many users max per Home based AP?
• Whats VPN?
• What are the 3 non overlapping channels?