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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

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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 CodesTrue or False

RF stands for “Radio Field”True or False

Line Loss refers to attenuation of signal in coax cableTrue 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

QUIZ


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.


CH 4 & 5

Quiz

Lecture

Lab Lecture

Lab AP Set-up


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


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 Intersil’s Prim 2 Chipset

      • NetStumbler Problem

    • CF cards---PDA’s


CH 5Common Wireless Network Components


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


CH 5Common Wireless Network Components


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    • Outdated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


CH 5Common Wireless Network Components


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


CH 5Common Wireless Network Components


CH 5Common Wireless Network Components

  • Network-Side Wireless Equipment

    • AP

    • Bridge

    • Gateways and Routers

  • Plus all of the wires equipment


CH 5 Components Common Wireless Networks

  • AP

    • Do the work of a hub, bridge, gateway, router.

      • That’s what the book says

      • Untrue an AP is simply a hub.

      • True AP’s don’t 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


CH 5 Components Common Wireless Networks

  • Software AP’s

    • 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 it’s good for a homework and daily quiz.

        • You must demonstrate it for the class.


CH 5 Components Common Wireless Networks


CH 5 Components Common Wireless Networks

  • Bridging

    • Acts as a repeater between wireless segments

    • Some act as Access Points

      • Some AP’s 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


CH 5 Components Common Wireless Networks


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


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


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


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!!


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 won’t 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


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 AP’s 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.


  • 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 LAN’s together.

      • Be creative!!

      • It can be done

      • Put in place as a backup to wired!!


    UCI


    CH 6Typical Wireless Installations

    • Community and WISP

      • AKA “Hotspots”

      • Some charge some do not

      • WISP

        • Mainly used for outlying areas where it’s 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.


    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. 


    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!


    Homework

    • NONE


    Quiz! Week 5

    • What’s WEP?

    • What’s a WEP Key?

    • What’s an SSID

    • What’s WISP?

    • How do you tell an AP from a Router?

    • What’s the longest WEP key that WI-FI certified?

    • What’s a true AP

    • How many users max per Home based AP?

    • What’s VPN?

    • What are the 3 non overlapping channels?


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