Introduction To Networking


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Introduction To Networking

  1. 1. Introduction to Networking <ul><li>Why use networks? </li></ul><ul><li>Physical network structure </li></ul><ul><li>Network Servers </li></ul><ul><li>Network Clients </li></ul><ul><li>Network Operating Systems </li></ul><ul><li>LANs and WANs </li></ul>
  2. 2. What Is A Network?
  3. 3. Why Use Networks? <ul><li>Sharing… </li></ul><ul><ul><li>Data </li></ul></ul><ul><ul><li>Software </li></ul></ul><ul><ul><li>Printers </li></ul></ul><ul><ul><li>Processing power </li></ul></ul><ul><ul><li>Access to the Internet </li></ul></ul><ul><li>Controlling… </li></ul><ul><ul><li>Security </li></ul></ul><ul><ul><li>Administration </li></ul></ul>
  4. 4. The Network Server Printing Data Software Access to the Internet
  5. 5. The Network Client Uses Resources Write file to drive C: Write file to drive X:
  6. 6. Peer-To-Peer Networks Using Using Using Using Sharing Sharing Sharing
  7. 7. Limitations <ul><li>300 ft. effective range from access point </li></ul><ul><ul><li>1400 ft maximum range </li></ul></ul><ul><li>Structural interference </li></ul><ul><li>Interference from other devices such as cordless phones. </li></ul>
  8. 8. Client/Server Networks Using Sharing Using Using
  9. 9. Network Operating Systems <ul><li>Several products </li></ul><ul><ul><li>Microsoft Windows NT/2000/2003 </li></ul></ul><ul><ul><li>Novell Netware </li></ul></ul><ul><ul><li>Banyan Vines etc </li></ul></ul><ul><li>All run on the server and share resources </li></ul><ul><ul><li>Hard disk space </li></ul></ul><ul><ul><li>Printers etc </li></ul></ul>
  10. 10. Directory Services <ul><li>Centralized control of all network resources </li></ul><ul><ul><li>Microsoft Windows 2000 </li></ul></ul><ul><ul><ul><li>Active Directory </li></ul></ul></ul><ul><ul><li>Novell Netware </li></ul></ul><ul><ul><ul><li>Network Directory Services (NDS) </li></ul></ul></ul><ul><ul><li>Banyan Vines </li></ul></ul>
  11. 11. Network Interface Card <ul><li>Physical interface for the PC to the cable </li></ul><ul><li>Can be add-on adapter </li></ul><ul><ul><li>PCMCIA/Cardbus </li></ul></ul><ul><ul><li>ISA/EISA </li></ul></ul><ul><ul><li>PCI </li></ul></ul><ul><li>Often built into motherboard </li></ul><ul><li>Has a unique physical address </li></ul><ul><ul><li>(MAC Address) </li></ul></ul>
  12. 12. Network Cables <ul><li>Coaxial </li></ul><ul><ul><li>Thin and Thick Ethernet (10Base2, 10Base5) – used to transmit video </li></ul></ul><ul><li>Unshielded Twisted Pair (UTP) </li></ul><ul><ul><li>10baseT, 100baseT (most common </li></ul></ul><ul><li>Shielded Twisted Pair (STP) </li></ul><ul><li>Fiber-optic </li></ul>
  13. 13. Local Area Networks (LANs)
  14. 14. Wide Area Networks (WANs)
  15. 15. Cable-Less (i.e. Wireless) Connections <ul><li>Narrow band radio transmission (RF) </li></ul><ul><ul><li>Subject to interference </li></ul></ul><ul><ul><li>Security issues </li></ul></ul><ul><li>Infra-red transmission (IR) </li></ul><ul><ul><li>Line of sight required </li></ul></ul><ul><ul><li>Other light sources can interfere </li></ul></ul><ul><ul><li>Ex. Palm beaming/CPS “clickers” </li></ul></ul>
  16. 16. Standards <ul><li>IEEE 802.11.b –2.4GHz – 11Mbps </li></ul><ul><li>IEEE 802.11.a – 5GHz – 54 Mbps </li></ul><ul><li>IEEE 802.11g – 2.4Ghz – Hybrid 11/54Mbps (most common) </li></ul><ul><li>New! IEEE 802.11n – up to 100 Mbps </li></ul>
  17. 17. Security Overview <ul><li>WEP - Wired Equivalent Privacy </li></ul><ul><ul><li>40 bit vs. 128 bit </li></ul></ul><ul><ul><li>Is Encryption Necessary? </li></ul></ul><ul><li>Open access vs. Secured </li></ul><ul><li>Other Security Measures </li></ul><ul><ul><li>Content Filtering </li></ul></ul><ul><ul><li>Network Partitioning </li></ul></ul>
  18. 18. Applications <ul><li>Any application currently used on a traditional wired network can be used on a wireless network. </li></ul><ul><li>New applications may be available or can be developed to take advantage of wireless, such as Wireless PDA access to a card catalog. </li></ul>
  19. 19. Wireless Network Components <ul><li>Access Points </li></ul><ul><li>NICs – Network Interface Cards </li></ul><ul><ul><li>PCMCIA </li></ul></ul><ul><ul><li>USB </li></ul></ul><ul><ul><li>PCI </li></ul></ul><ul><ul><li>CompactFlash </li></ul></ul><ul><li>Other Wireless Devices </li></ul><ul><ul><li>Bridges and Routers </li></ul></ul><ul><ul><li>Print Servers </li></ul></ul><ul><li>PCs, Laptops, PDAs, even Projectors </li></ul>
  20. 20. Security (Encryption, Content Filtering, Privacy, etc.) <ul><li>Content Filtering & Proxy Servers </li></ul><ul><ul><li>Web content filtering that has generally been software on the desktop would have to be handled by a server if people are allowed to use their own laptops. Note: This is required by CIPA for all government organizations, including schools. </li></ul></ul><ul><ul><li>Proxy servers allow you to control what information people have access to. This is a good practice anyway, allowing you to control at a global level what information travels over your network. It also allows you to track usage. </li></ul></ul>
  21. 21. Security (Encryption, Content Filtering, Privacy, etc.) <ul><li>Viruses and Hacker </li></ul><ul><ul><li>Wireless does not add any additional threat in the way of viruses. </li></ul></ul><ul><ul><li>Anyone, anywhere can attack a network that is connected to the Internet. Wireless does not increase that chance. Security measures such as firewalls, can reduce the risk. </li></ul></ul>
  22. 22. Why Deploy Wireless? <ul><li>Cost savings over wireline. </li></ul><ul><li>Can not run wire to locations needed. </li></ul><ul><li>To enable patrons to bring their own laptop, therefore reducing the cost of owning many PCs. </li></ul><ul><li>To enable you to easily move PCs. </li></ul><ul><li>To be on the leading edge. </li></ul>
  23. 23. Cost <ul><li>802.11b Wireless Access Points start around $100.00 for basic connectivity and run up to $500.00 for more management features. </li></ul><ul><li>802.11b Network Interface Cards (NICs) cost between $50-$100 and come in USB, PCI (desktop), PCMCIA (laptop) and CompactFlash versions. </li></ul>
  24. 24. Bluetooth – 802.15 <ul><li>Bluetooth is the standard for wireless personal area networks or WPAN. It allows high speed transmission of data over very short distances. </li></ul><ul><li>Bluetooth is normally used for transferring data between laptops or devices, or in Internet Kiosk type applications where roaming is not needed. </li></ul>
  25. 25. Networking Technology Review <ul><li>Why use networks? </li></ul><ul><li>Physical network structure </li></ul><ul><li>Network Servers </li></ul><ul><li>Network Clients </li></ul><ul><li>Network Operating Systems </li></ul><ul><li>LANs and WANs </li></ul>
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