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INFORMATION NETWORKS

INFORMATION NETWORKS. TIER 9. Let’s Re-Cap…. General Concepts. What is Computer? Data & Information 3 components of a Computer System 4 elements of a Computer System Features of a Computer System Disadvantages of Computers Units of Storage. COMPUTER SYSTEM. - -. - - -.

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INFORMATION NETWORKS

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  1. INFORMATION NETWORKS TIER 9

  2. Let’s Re-Cap… General Concepts • What is Computer? • Data & Information • 3 components of a Computer System • 4 elements of a Computer System • Features of a Computer System • Disadvantages of Computers • Units of Storage

  3. COMPUTER SYSTEM - - - - -

  4. Let’s Re-Cap… COMPUTER NETWORKS • What is Computer Networks? • LAN & WAN • Network Topologies • Modem & Signals • Networking Equipments • NIC, Hub, Switch, Bridge, Router • Cables . . .

  5. Connect Terminals / Nodes ConnectNetworks HUB BRIDGE Connects & transmits only + Intelligence SWITCH ROUTER Sends packet direct to terminal (via address) Detects traffic & failures

  6. COMMUNICATION PROTOCOLS • Why do we need protocols for communication?

  7. COMMUNICATION PROTOCOLS

  8. …GROUP PRACTICE… • Connect 2 PC using LAN • Identify components needed • Draw diagram of the network • Label the components

  9. TELEPHONE NETWORKS IN COMPUTING • What does telephones have to do with the Internet?

  10. TELEPHONE NETWORKS IN COMPUTING • What does telephones have to do with the Internet?

  11. TELEPHONE NETWORKS IN COMPUTING • What does telephones have to do with the Internet?

  12. TELEPHONE NETWORKS IN COMPUTING • What does telephones have to do with the Internet?

  13. NETWORK MANAGEMENT Why do we NEED network managers ??? • Collect & analyze traffic info • Find solutions • Checks & monitors bandwidth, circuits & hardware • Identify error • Analyze error • Separate error from network • Correct error • Protection of network • Create & maintain passwords & access control • Monitor & control access • Create & maintain security policy • Collect & maintain info of network • e.g. network system, its status, supplier, component connection

  14. APPLICATIONS • The Internet • Existence = why ? • Physical: Computers, networks & services • Allows access to large resource of data & information  hosts / servers • Protocol = what ? • Any computer can act as a host

  15. APPLICATIONS • WWW • WWW ≠ the Internet ! • Difference ??? • “Universal readership” = concept of WWW creation • Tools: • Browsers • Servers / gateways • Addressing schemes • Common protocols • Format negotiation • Server vs. ISP

  16. SUMMARY  • COMMUNICATION PROTOCOLS • TELEPHONE NETWORKS • NETWORK MANAGEMENT • APPLICATIONS

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