Ch6-a Presentation

641 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
641
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Ch6-a Presentation

  1. 1. Computers © 2005 Prentice-Hall, Inc. Slide 1
  2. 2. Computers Chapter 6 Networks and Networking © 2005 Prentice-Hall, Inc. Slide 2
  3. 3. Computers Chapter 6 – Networks and Networking <ul><li>Objectives </li></ul><ul><ul><li>Apply the concept of connectivity to your life </li></ul></ul><ul><ul><li>Understand data communications hardware </li></ul></ul><ul><ul><li>Identify data transmissions services </li></ul></ul><ul><ul><li>Understand the various network topologies </li></ul></ul><ul><ul><li>Recognize the potential of home networking </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 3
  4. 4. Computers Networks and Networking <ul><li>Our Wired World </li></ul><ul><ul><li>Connectivity – the degree to which software, hardware, and databases are functionally linked </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 4
  5. 5. Computers Networks and Networking <ul><li>Our Wired World </li></ul><ul><ul><li>Cooperative processing </li></ul></ul><ul><ul><ul><li>Intracompany networking – cooperation within the company </li></ul></ul></ul><ul><ul><ul><li>Intercompany networking – cooperation with other companies and customers </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 5
  6. 6. Computers Networks and Networking <ul><li>Our Wired World </li></ul><ul><ul><li>Intranet –internal network based on Internet technology </li></ul></ul><ul><ul><li>Extranet – an extension of an intranet, partially available to authorized customers and suppliers </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 6
  7. 7. Computers Networks and Networking <ul><li>Our Wired World </li></ul><ul><ul><li>Virtual Private Network (VPN) – network transmissions are tunneled through the Internet </li></ul></ul><ul><ul><li>Tunneling – one network uses another to send data </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 7
  8. 8. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Data communications or telecommunications – distribution of data </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 8
  9. 9. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Server computers – central computers that control the network </li></ul></ul><ul><ul><li>Client computers – computers, linked to a server, that create the network </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 9
  10. 10. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Proxy server computers – handle some requests, hand others to the actual server computers </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 10
  11. 11. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Telephone-link modem – converts analog signals to digital and digital signals to analog </li></ul></ul><ul><ul><li>Analog – voice communication, such as over a telephone line </li></ul></ul><ul><ul><li>Digital – 1’s and 0’s used to represent data in a computer </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 11
  12. 12. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Modem </li></ul></ul><ul><ul><ul><li>Internal </li></ul></ul></ul><ul><ul><ul><li>External </li></ul></ul></ul><ul><ul><ul><li>Voice/data/fax modem </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 12
  13. 13. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Cable modem – provides Internet access via cable television lines </li></ul></ul><ul><ul><li>DSL (Digital Subscriber Line) – Internet access via special line provided by a telephone company </li></ul></ul><ul><ul><li>Satellite modem – Internet access via communications satellite </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 13
  14. 14. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Network interface card (NIC) – also called network card and network adapter </li></ul></ul><ul><ul><ul><li>Needed to connect a personal computer to a network </li></ul></ul></ul><ul><ul><ul><li>Ethernet – de facto standard </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 14
  15. 15. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Gateway – allows for communication between networks using different protocols </li></ul></ul><ul><ul><li>Router – routes messages to the appropriate destination </li></ul></ul><ul><ul><li>Gateway router – both functions in one device </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 15
  16. 16. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Message </li></ul></ul><ul><ul><ul><li>Source – device that sends the message </li></ul></ul></ul><ul><ul><ul><li>Destination – device that receives the message </li></ul></ul></ul><ul><ul><ul><li>Handshaking – router establishes the connection between the source and the destination </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 16
  17. 17. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Network address – assigned to each computer on a network; used to send messages to the appropriate destination </li></ul></ul><ul><ul><li>Backbone – the routers, gateways, and other equipment that link the computers of the network </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 17
  18. 18. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Hub – expands the number of nodes on a network </li></ul></ul><ul><ul><ul><li>Half-duplex – data can only be sent in one direction at a time </li></ul></ul></ul><ul><ul><li>Switch – acts like a hub for a local area network (LAN) </li></ul></ul><ul><ul><ul><li>Full-duplex – data can be sent in both directions at once </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 18
  19. 19. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Terminals </li></ul></ul><ul><ul><ul><li>Video Display Terminal (VDT) – input/output device </li></ul></ul></ul><ul><ul><ul><li>Thin client – smart terminal, capable of some processing </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 19
  20. 20. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Telephony – integration of telephones and computers </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 20
  21. 21. Computers Networks and Networking <ul><li>Data Communications Hardware </li></ul><ul><ul><li>Automatic Teller Machine (ATM) – used in banking </li></ul></ul><ul><ul><li>Point-of-Sale (POS) terminals – used in retail </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 21
  22. 22. Computers Networks and Networking <ul><li>The Data Communications Channel </li></ul><ul><ul><li>Communications channel – media a message must pass through on a network </li></ul></ul><ul><ul><ul><li>Line </li></ul></ul></ul><ul><ul><ul><li>Link </li></ul></ul></ul><ul><ul><ul><li>Pipe </li></ul></ul></ul>© 2005 Prentice-Hall, Inc. Slide 22
  23. 23. Computers Networks and Networking <ul><li>The Data Communications Channel </li></ul><ul><ul><li>Transmission media </li></ul></ul><ul><ul><li>Measured in bits per second (bps) </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 23
  24. 24. Computers Networks and Networking <ul><li>The Data Communications Channel </li></ul><ul><ul><li>Twisted-pair wire </li></ul></ul><ul><ul><ul><li>POTS (plain old telephone services) </li></ul></ul></ul><ul><ul><ul><li>Digital Subscriber Line (DSL) </li></ul></ul></ul><ul><ul><li>Cat5 cabling – uses four twisted pairs of wire; speeds of up to 100 Mbps </li></ul></ul><ul><ul><li>Cat5e cabling – speeds of up to 1 Gbps </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 24
  25. 25. Computers Networks and Networking <ul><li>The Data Communications Channel </li></ul><ul><ul><li>Coaxial cable – high capacity channel, capable of speeds up to 10 M bps </li></ul></ul><ul><ul><li>Fiber optic cable – carries data as laser generated pulses of light </li></ul></ul>© 2005 Prentice-Hall, Inc. Slide 25

×