Nms chapter 01


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Network Fundamentals

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Nms chapter 01

  1. 1. Chapter 1Network Fundamentals Networking Fundamentals and Media Services (NMS)
  2. 2. Network A system in which a number of computers are linked together to share data and peripherals Resources Hard disks, printers, internet connection, etc
  3. 3. Evolution of Networks Local Area Metropolitan Wide Area Connect 2 Sneakernet Network Area Network Network computers (LAN) (MAN) (WAN)• Hand carry thumb • Computers • Computers • Computers drive / disk interconnected interconnected interconnected within a building within several around the world buildings
  4. 4. Why network? Share information or data Share hardware or software Sharing information or data Increase security • Documents • Videos & audio files Backup files • Calendar schedule • Social media Share internet connection Play multiplayer games
  5. 5. Network security Logging out if you will be away from your workstation for more than 15 minutes Using unusual passwords (containing letters, number and special characters) and changing them regularly Using deceptive filenames for sensitive data Conducting audit trial to track network activities
  6. 6. Intranet vs InternetIntranet Network to make information available to employees on the company’s internal networkInternet World-wide network of computers accessible to anyone who knows their Internet Protocol (IP) address - the IP address is a unique set of numbers (such as that defines the computers location.
  7. 7. Backup A file server is a computer responsible for the storage and management of data in a central location.
  8. 8. Components of LAN Computers Hosts Peripherals (Shared Resources) Network Interface Card (NIC) Networking media –> how the hosts communicate Network traffic control or Network Communication devices
  9. 9. Components of LAN
  10. 10. Network Interface Card (NIC) A printed circuit board (PCB) that fits into the expansion slot or integrated into the mother board Also called network adapter Adapt the host device to the network medium Unique Media Access Control (MAC) address
  11. 11. Networking Media Coaxial cable Fiber Optic cable Free space Copper cable
  12. 12. Networking Media Coaxial cable
  13. 13. Networking Media Fiber Optical cable
  14. 14. Networking Media Copper cable    Pairs with different twist rates to reduce crosstalk RJ45 (Registered Jack )
  15. 15. Network traffic control or NetworkCommunication devices Repeater – amplifies the electrical signals and resends the data, single port “in” and single port “out” Hub – may be 4, 8, 12, 16 or 24 ports  Passive: just split the signal for multiple hosts  Active: multi-port repeater, extend a cable length Bridge – filter traffic between two LAN segment using MAC address Switch – multi-port bridge  Difference between Hub and Switch? Router – direct traffic from one network to another (path selection and switching of packets) using IP address
  16. 16. SymbolsAnother network orthe whole internet
  17. 17. Q&A
  18. 18.  Work in groups of 1-3 students  Create a mindmap of this topic  Prize for the best mindmapExercise 1 - mindmapChapter 1