Succeeding with Technology Succeeding with Technology

download Succeeding with Technology Succeeding with Technology

of 51

  • date post

    03-Nov-2014
  • Category

    Documents

  • view

    10
  • download

    0

Embed Size (px)

description

 

Transcript of Succeeding with Technology Succeeding with Technology

  • 1. Review of Basic Concepts: CH 4-5
    • Telecommunications
  • The Internet
  • The Web

Please discontinue use of cell phone and turn off ringer 2. Telecommunictions &Computer Networking

  • Networking Hardware, Software, and Protocols
  • Network Types
  • Wireless Networks

3. Telecommunications Electronic Communications

  • Voice and data telecommunications
    • Analog vs. Digital
  • Components
    • Hardware
    • Software
    • Protocols: rules of engagement

4. Networking Media

  • Coaxial Cable
  • Fiber Optic Cable
  • Radio Frequency
  • Twisted Pair Cable

5. Signal Frequency

  • Frequency: the speed at which a signal changes from high to low.
  • Bandwidth: the range of signal frequencies that can be sent over a given medium at the same time.
    • Often expressed as bits per second
    • Broadband: faster than 200Kbps

6. Networking Devices

  • Modem: modulates and demodulates signals from one form to another.
  • Network Adapter: Expansion card, or external device installed on a computing device used to connect to a network.

7. Networking Devices

  • Network Control Devices:
    • Hub
    • Switch
    • Repeater
    • Bridge
    • Gateway
    • Router
    • Wireless Access Point
    • Firewall

8. Wireless Fidelity (Wi-Fi)

  • Wi-Fi: devices that communicate wirelessly using the 802.11x protocol.
  • 250-1,000 ft range
  • 802.11b 4.5 Mbps
  • 802.11g 11 Mbps
  • www.boingo.com

Access Point 9. Bluetooth

  • Bluetooth: Wireless technology that enables a wide variety of digital devices to communicate directly.
  • 33 ft range
  • 1 Mbps
  • www.bluetooth.com

10. Infrared (IRDA)

  • Infrared technology utilizes infrared rays to send data over a short distance wirelessly.
  • 4 ft range
  • Narrow-angle cone (30 o )
  • Line-of-sight
  • 4-16 Mbps
  • www.mzoop.com

11. Wireless Comparison Wi-fi Access point centered LAN Omni-direction Through obstructions 250 ft range indoors 11 Mbps Bluetooth Point-to-point Omni-direction Through obstructions 33 ft 1 Mbps Infrared Point-to-point Narrow-angle Line-of-sight 4 ft 4 Mbps 12. Network Types

  • Local Area Network (LAN)
    • Connects computer systems and devices within a common geographic area
  • Wide Area Network (WAN)
    • Connects LANs between cities, cross country, and around the world using microwave and satellite transmission or telephone lines.
  • Global Area Network (GAN)
    • An International network
  • An internet
    • A network consisting of connected smaller networks

13. Network Types

  • Personal Area Network (PAN)
    • The interconnection of personal information technology devices within the range of an individual - typically using Bluetooth Tech.

The Body Bus? The original PAN was designed by Thomas Zimmerman and allowed users to pass digital electronic information through touch, by transferring information from one persons device to anothers, running a subtly current through the body. 14. Installing Home Wi-fi

  • Requirements
    • High-speed Internet
    • Cable Modem or DSL Modem (provided be ISP)
    • Wireless Access Point/Router
    • Wireless adapters for each device.
    • Additional Access Points as needed.

http://www.linksys.com/ Cable Modem Wireless Access Point / Router To Cable Co. 15. The Internet

  • The Internet
  • The Web
  • Applications

16. Visualization of the Internets topology fromhttp://www.cybergeography.org/atlas/topology.html What is the Internet? 17. The Internet

  • TheInternetis the worlds largest public computer network, a network of networks that provides a vast array of services to individuals, businesses, and organizations around the world.
  • The Internet is a combination of hardware, software, and protocols.

18. Internet Hardware

  • TheInternet backboneconsists of the main pathways and connections of the Internet owned primarily by telecom companies.

http://en.wikipedia.org/wiki/Internet_backbone Verizons/MCIs UUNet carries 28% of Internet traffic 19. Internet Hardware

  • Network Service Providers
    • Major telecom companies that provide the Internet backbone.

http://navigators.com/isp.html Network Service Providers 27.9% Verizon/MCI/UUNET 10.0% AT&T6.5% Sprint6.3% Genuity (level 3) 4.1% PSINet3.5% Cable & Wireless2.8% XO Communications2.6% Verio1.5% Qwest 20. Internet Hardware

  • Points of Presence (POPs)
    • Facilities provided by Network Service Providers that allow users to connect to the Internet backbone.
  • Internet Service Providers
    • Companies that provide users with access to the Internet.
    • Dial-up vs. DSS vs. Cell vs.DSLvs.Cable
    • Top 22 ISPs:http://www.isp-planet.com/research/rankings/usa.html

21. Internet Hardware

  • Routers: computing devices that manage network traffic by evaluating data packets and routing them to their destination.

http://computer.howstuffworks.com/router1.htm The Cisco CRS-1 router is controlled by a unique self-healing and self-defending operating system designed for always-on operation while scaling system capacity up to 92 Tbps.Routers such as this one manage traffic on the Internet Backbone. 7 22. Packet Switching Dear Joan, Hi! Hows it goin? Just finished midterms, and it looks like I might graduate this semester after all! :-) My computer teacher is really great and I guess that I learned more than I thought in those wonderful lectures that I had previously written you about. An email message 23. Packet Switching learned more than I thought in those wonderful lectures that I had previously written you about. Broken into packets looks like I might graduate this semester after all! :-) My computer teacher is really great and I guess that I Dear Joan, Hi! Hows it goin? Just finished midterms, and it 24. Packet Switching Packet headers added Dear Joan, Hi! Hows it goin?Just finished midterms, and it Message 3761HZADate May 1Packet 1 of 3 From sweetykb@aol.com To joan_kelly@yale.edu learned more than I thought in those wonderful lectures that I had previously written you about. Message 3761HZADate May 1Packet 3 of 3 From sweetykb@aol.com To joan_kelly@yale.edu looks like I might graduate this semester after all! :-) My computer teacher is really great and I guess that I Message 3761HZADate May 1Packet 2 of 3 From sweetykb@aol.com To joan_kelly@yale.edu 25. Packet Switching Each packet sent individually over the network Dear Joan, Hi! Hows it goin?Just finished midterms, and it Message 3761HZADate May 1Packet 1 of 3 From sweetykb@aol.com To joan_kelly@yale.edu looks like I might graduate this semester after all! :-) My computer teacher is really great and I guess that I Message 3761HZADate May 1Packet 2 of 3 From sweetykb@aol.com To joan_kelly@yale.edu learned more than I thought in those wonderful lectures that I had previously written you about. Message 3761HZADate May 1Packet 3 of 3 From sweetykb@aol.com To joan_kelly@yale.edu 26. Packet Switched Network email email 27. Circuit Switched Network 28. Packet Switching

  • Packet switching is much more efficient than circuit switching.

Technology: Networking/Telecoms Wednesday 28 May 2003Sprint moves to packet-switch network Sprint is to change its entire circuit-switched telephone network to packet technology in an attempt to keep up with customer demand for capacity. Sprint's eight million lines will be moved over to the packet-based asynchronous transfer mode (ATM) system, allowing voice, video and data to be broken down into small digital blocks and sent, in effect, simultaneously.This allows the network to be used more efficiently, and will also allow new multimedia services, Sprint said. Sprintis the first major telecoms company to move all of its local, tandem and long-distance networks over to packet technology, according to Nortel Networksspokeswoman Ann Fuller. 29. Internet Protocols

  • Protocolsare rules that govern how data is transmitted and received.
  • They govern all Network and Internet communications:
    • The Internet
    • The Web
    • Email