Network Sampoerna

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Network Sampoerna

  1. 1. Networks Jimmy F G - Thursday, June 12, 2008 Sampoerna Foundation
  2. 2. Networks <ul><li>By the end of this session, you will: </li></ul><ul><li>Define and describe a LAN and WAN. </li></ul><ul><li>Understand the hardware required. </li></ul><ul><li>Know the 3 LAN topologies. </li></ul>
  3. 3. Networks <ul><li>What is a Network ? </li></ul><ul><li>What is a LAN ? What hardware do you need to make one? </li></ul><ul><li>What is a WAN ? What hardware do you need to make one? </li></ul><ul><li>What are the advantages and disadvantages of a network? </li></ul><ul><li>Draw a star , ring and bus network – give advantages and disadvantages of each. </li></ul>
  4. 4. Networks A network is two or more computers connected together so they can communicate which each other. There are 2 main types of network…
  5. 5. Networks: LANs LAN stands for: L OCAL A REA N ETWORK LANs are networks that are found where computers within a building need to communicate. They are Small and Local!
  6. 6. Networks: LANs <ul><li>File Server : Runs software, stores files. </li></ul><ul><li>Terminals : Workstations that give network access. </li></ul><ul><li>Print Server : Queues up all print jobs from users in network. </li></ul><ul><li>Cables (wire/optic) : Sends data. </li></ul>What hardware do you need for a LAN network?
  7. 7. Networks: WANs WAN stands for: W IDE A REA N ETWORK WANs are networks that are found where computers in different areas or countries need to communicate. They are long range and not local!
  8. 8. Networks: WANs What extra hardware do you need for a WAN network? <ul><li>Modems : To connect up to a telephone system (instead of cable). </li></ul>How a modem works…
  9. 9. Networks: Ad/Disad Some advantages of a network are: <ul><li>Resources (Hardware and Software) can be shared. </li></ul><ul><li>Allows more effective communication between users e.g. via e-mail. </li></ul><ul><li>Networks are cheaper than “stand-alone PCs.” </li></ul><ul><li>Information held on the network can be accessed by all users with authorised access. </li></ul>
  10. 10. Networks: Ad/Disad Some disadvantages of a network are: <ul><li>The set-up and maintenance costs can be expensive. </li></ul><ul><li>A fault with the network server can cause difficulties with the organisation. </li></ul><ul><li>Networks need security measures to restrict access to users. </li></ul><ul><li>WANs are vulnerable to hackers and viruses. </li></ul>
  11. 11. Networks As well as knowing the advantages and disadvantages of a network… You need to know the advantages and disadvantages of 3 network topologies…
  12. 12. Network Topologies There are 3 main types of network topologies: The Ring Network The Bus Network The Star Network
  13. 13. Network Topologies The Ring Network: Computers are connected together to form a ring shape so that none of the m is more important than any of the others.
  14. 14. Network Topologies The Ring Network: <ul><li>Advantages: </li></ul><ul><li>They are cheap to expand. </li></ul><ul><li>The data flows around the network in one direction so it is fast. </li></ul><ul><li>There is no reliance on a central computer. </li></ul><ul><li>Disadvantages: </li></ul><ul><li>If there are a lot of users on the network, it could slow down as all the data is sent along a single line. </li></ul><ul><li>If one computer in the ring stops working, the whole network stops. </li></ul>
  15. 15. Network Topologies The Bus (or line) Network: Computers are connected like bus stops on a main road. None of the m is more important than any of the others.
  16. 16. Network Topologies The Bus (Line) Network: <ul><li>Advantages: </li></ul><ul><li>It is cheap as it uses the least amount of cable. </li></ul><ul><li>More computers can be added without disruption. </li></ul><ul><li>Disadvantages: </li></ul><ul><li>With a lot of users, the network will be slow as data has to travel through the same central cable. </li></ul><ul><li>Failure of the central cable will stop the network from working. </li></ul>
  17. 17. Network Topologies The Star Network: Computers are connected like a star to a central computer such as a mainframe. This is also called the “host” computer.
  18. 18. Network Topologies The Star Network: <ul><li>Advantages: </li></ul><ul><li>If a cable fails, it will only affect one workstation. </li></ul><ul><li>More computers can be added without disruption. </li></ul><ul><li>Disadvantages: </li></ul><ul><li>It is more expensive as it uses the most cabling. </li></ul><ul><li>Failure of the central computer will stop the network from working. </li></ul>
  19. 19. Networks: Security Because networks are almost vital to an organisation’s daily activities, they must be kept safe and secure… There are 3 main types of network security… Physical , Access and Data .
  20. 20. Networks: Security Physical security means that the hardware of the network is protected from theft and kept safe.
  21. 21. Networks: Security Access security means that there is a limit to the amount of access a user has to the information held on the network.
  22. 22. Networks: Security Data security means that there are measures taken to prevent the loss of data held on the system.
  23. 23. File Server - HW <ul><li>Main computer on the network. </li></ul><ul><li>More powerful than other computers on the network. </li></ul><ul><li>Contains a large amount of RAM and Hard Disk space. </li></ul><ul><li>Holds the networks OS e.g. Windows XP </li></ul><ul><li>Holds the application software e.g. Microsoft Office Suite. </li></ul><ul><li>Stores the user files created on the system. </li></ul>
  24. 24. Network Interface Card - HW <ul><li>Also known as NIC. </li></ul><ul><li>Each computer MUST have one of these. </li></ul><ul><li>It communicates with the file server and other computers on the network. </li></ul>an RJ-45 NIC
  25. 25. Network Cables - HW <ul><li>These plug into the back of each computer and link them together. </li></ul><ul><li>They go straight into the Network Interface Card inside the computer. </li></ul>This is an RJ-45 cable, otherwise known as an Ethernet Cable.
  26. 26. Switches - HW <ul><li>A switch is a single connection point for a group of computers. </li></ul><ul><li>The switch is then connected to the file server and organises the communication. </li></ul><ul><li>Not needed with all networks. </li></ul>
  27. 27. WANs HW and SW By the end of this section, you will know and understand the hardware and software involved in making a WAN!
  28. 28. Modem - HW <ul><li>Stands for Modulator – Demodulator. </li></ul><ul><li>First created to take digital signals from a computer and convert them to analogue so that they can be transmitted down a telephone line. </li></ul><ul><li>Speed at which a modem operates will affect the download time of web pages and files. </li></ul>
  29. 29. ISP - Internet Service Provider <ul><li>An ISP sells Internet access to companies and individuals. </li></ul><ul><li>It provides web servers which connect to the Internet. </li></ul><ul><li>An ISP will provide it’s customers with a wide range of services… </li></ul><ul><ul><li>Bandwidth options. </li></ul></ul><ul><ul><li>Email service. </li></ul></ul><ul><ul><li>Web Hosting. </li></ul></ul><ul><ul><li>Online and Telephone assistance. </li></ul></ul>
  30. 30. Browser Software <ul><li>Browser software allows users to view and use the web pages on the Internet. </li></ul><ul><li>Features include: </li></ul><ul><ul><li>An Address Bar. </li></ul></ul><ul><ul><li>A Navigation Bar. </li></ul></ul><ul><ul><li>A Bookmark/Favourites Option. </li></ul></ul><ul><ul><li>A Search Engine. </li></ul></ul><ul><ul><li>A History Button. </li></ul></ul><ul><ul><li>Browser Setting and Internet Options e.g. Filtering. </li></ul></ul>

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