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Computers Are Your Future Eleventh Edition

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1 Computers Are Your Future Eleventh Edition
* 07/16/96 Computers Are Your Future Eleventh Edition Chapter 7: Networks: Communicating & Sharing Resources Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

2 Networks: Communicating & Sharing Resources
* 07/16/96 Networks: Communicating & Sharing Resources This is Figure 7.22. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

3 * 07/16/96 Network Fundamentals A network links multiple computer systems to enable them to share data and resources. Categories of computer networks for business and organizations: Local area network (LAN) Wide area network (WAN) Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

4 Network Fundamentals This is Figure 7.2.
* 07/16/96 Network Fundamentals This is Figure 7.2. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

5 Network Fundamentals LAN WAN
* 07/16/96 Network Fundamentals LAN Uses cables, radio waves, or infrared signals Links computers in a limited geographic area WAN Uses long-distance transmission media Links computer systems a few miles or thousands of miles apart The Internet is the largest WAN Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

6 * 07/16/96 Network Fundamentals Communication devices convert data into signals to travel over a medium. Computers Modems Routers Switches Network interface cards (NICs) This is Figure 7.3. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

7 Network Fundamentals A node is any device connected to a network.
* 07/16/96 Network Fundamentals A node is any device connected to a network. Network interface card (NIC) An expansion board or adapter that provides a connection between the computer and the network Notebook computers have wireless NICs Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

8 Network Fundamentals Routers Switches Connect two or more networks
* 07/16/96 Network Fundamentals Routers Connect two or more networks Determine the best route to transmit data Switches Filter and forward data between nodes Are similar to routers but work within a single network Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

9 Network Fundamentals Wireless access point (WAP)
* 07/16/96 Network Fundamentals Wireless access point (WAP) Receives and transmits radio signals Joins wireless nodes to a wired network This is Figure 7.5. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

10 Network Fundamentals File server
* 07/16/96 Network Fundamentals File server High-speed computer that provides program and data files to network users Contains the network operating system (NOS) File directories for file and resource location Computerized software update distribution Internet services support Protection of services and data Access to connected hardware by authorized users Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

11 Advantages & Disadvantages of Networking
* 07/16/96 Advantages & Disadvantages of Networking Networking Advantages Hardware cost reduction Sharing of information, data, and applications Data management centralization Linking of people Disadvantages Loss of autonomy Lack of privacy Security threats Loss of productivity Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

12 Local Area Networks Peer-to-peer (P2P) networks
* 07/16/96 Local Area Networks Peer-to-peer (P2P) networks Share files without a file server Are easy to set up Are best used for home or small offices with no more than 10 computers Do not require a network operating system Can be slow if there are too many users Security is not strong Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

13 Local Area Networks Peer-to-peer (P2P) networks This is Figure 7.8.
* 07/16/96 Local Area Networks Peer-to-peer (P2P) networks This is Figure 7.8. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

14 Local Area Networks Client/server networks
* 07/16/96 Local Area Networks Client/server networks Made up of one or more file servers and clients (any type of computer) Client software enables requests to be sent to the server Wired or wireless connections Do not slow down with heavy use Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

15 Local Area Networks Virtual private network Operates over the Internet
* 07/16/96 Local Area Networks Virtual private network Operates over the Internet Is accessible by authorized users for quick access to corporate information Uses secure, encrypted connections and special software Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

16 Local Area Networks This is Figure 7.11.
* 07/16/96 Local Area Networks This is Figure 7.11. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

17 Local Area Networks This is Figure 7.12.
* 07/16/96 Local Area Networks This is Figure 7.12. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

18 Local Area Networks This is Figure 7.13.
* 07/16/96 Local Area Networks This is Figure 7.13. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

19 Local Area Networks LAN protocols LAN technologies Wi-Fi
* 07/16/96 Local Area Networks LAN protocols LAN technologies Ethernet is the most-used LAN protocol. The most popular versions are Ethernet star networks, which use twisted-pair wiring and switches. Wi-Fi Uses radio waves to provide a wireless LAN standard at Ethernet speeds Needs a central access point, which could be a wireless router Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

20 Wide Area Networks Point of presence (POP) Backbones
* 07/16/96 Wide Area Networks Point of presence (POP) WAN connection point used to obtain access to the WAN Wired or wireless Backbones High-capacity WAN transmission lines gigaPoP (gigabits per second point of presence) transfers data exceeding 1 Gbps Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

21 Wide Area Networks This is Figure 7.20, Step 1.
* 07/16/96 Wide Area Networks This is Figure 7.20, Step 1. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

22 Wide Area Networks This is Figure 7.20, Step 2.
* 07/16/96 Wide Area Networks This is Figure 7.20, Step 2. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

23 Wide Area Networks This is Figure 7.20, Step 3.
* 07/16/96 Wide Area Networks This is Figure 7.20, Step 3. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

24 Wide Area Networks This is Figure 7.20, Step 4.
* 07/16/96 Wide Area Networks This is Figure 7.20, Step 4. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

25 * 07/16/96 Wide Area Networks WAN applications: , conferencing, document exchange, remote database access LAN to LAN Connections Transaction Acquisition Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

26 Home Networks Wired Home Networks
* 07/16/96 Home Networks Wired Home Networks Ethernet networks link computers with a switch or router. This is Figure 7.23. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

27 Home Networks Wireless Home Networks Wi-Fi is the wireless standard.
* 07/16/96 Home Networks Wireless Home Networks Wi-Fi is the wireless standard. Uses radio signals Communicates through network access points Needs wireless adapter or router This is Figure 7.25. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

28 Home Networks Setting up a home network Planning
* 07/16/96 Home Networks Setting up a home network Planning Select technology Purchase equipment and firewall software Configuring a wired network Connect each computer to the router Plug printer, scanner, etc., into a computer Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

29 Home Networks Setting up a home network Configuring a wireless network
* 07/16/96 Home Networks Setting up a home network Configuring a wireless network Connect each node to wireless router with a wireless adapter Connect DSL or cable modem to wireless router Maintenance and support Minimal maintenance required Unplug power source from router and other peripherals and restart computer to correct problems Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

30 Home Networks Future of home networking Control household appliances.
* 07/16/96 Home Networks Future of home networking Control household appliances. Protect homes with security systems. Manage home network events through central control units in new homes. Utilize wireless systems. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

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