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SLR04

Jack Piper Computing GCSE Englisch 54 Karten

SLR04

Karten in diesem Stapel (54)

  1. 1What is a computer network?A collection of computers and other devices (ie. printers, servers, scanners, etc) linked together to communicate and share resources.
  2. 2How can a computer network be connected?Either via a wired or wireless connection - or a mixture of both.
  3. 3Advantages of computer networks- Can share files
    - Share peripherals and connections
    - Can access files from any computer on network
    - Servers can control security, software updates and backup of data
    - Communication with people
  4. 4Disadvantages of computer networks- Increased security risk to data
    - Malware and viruses spread very easily
    - If a server fails, all the computers may not work
    - Computer may run more slowly if there is a lot of data travelling on the network
  5. 5What is a LAN?Covers a small geographical area. All hardware owned by the organisation using it. Wired using UTP or fibre optic cables or wireless using Wi-Fi.What is a LAN?
  6. 6What is a WAN?Covers a large geographical area that connects LANs together. Infrastructure hired from telecommunication companies. Connected with telephone lines, fibre optic cables or satellite links.What is a WAN?
  7. 7Example of a WANThe Internet
    (largest example)
  8. 8What is the Internet?A worldwide collection of interconnected computer networks
  9. 9What is IP addressing?Unique address that identifies a device on the internetor a local network. Allows the system to be recognised by other systems.
    Two types of IP address - IPv4 and IPv6
  10. 10What are routers?Connects multiple networks.
    Forwards information (data packets) destined for either its own network or other networks.
  11. 11What are packets?Data sent across networks. Contains a header (source & destination IP address, for example)
  12. 12Why do packets have a sequence ID?Packets can be reassembled into the correct order once they arrive at the destination because packets can arrive out of order.
  13. 13Fibre-optic cables- Longer distance
    - Higher bandwidth
    - Suffers from less interference
  14. 14Wireless access points- Connect without cables
    - WAP includes a wireless router/switch that provides functionality of all three devices in one
  15. 15Copper cable (UTP)- Cheap and flexible
    - Easy to install
  16. 16Network interface controller (NIC)Connects a device to a wired or wireless network.
    Uses a protocol to ensure successful communication.
  17. 17Advantages of wireless connectivity- No need for installing cables
    - Portable connection
    - Cost-saving
  18. 18Disadvantages of wireless connectivity- Bandwidth is lower than wired
    - File sharing/transfer speeds slower
    - Security is more of an issue
    - Easily obstructed by household items and building structures
  19. 19WiFi statsRange: 100 meters
    Bandwidth: 54 Mbit/s (high)
    Power consumption: High
  20. 20BluetoothRange: 1-100 meters
    Bandwidth: 3 Mbit/s (medium)
    Power consumption: Medium
  21. 21RFID/NFCRange: < 10 cm
    Bandwidth: 424 Kbit/s (low)
    Power consumption: Very low
  22. 22ZigBeeRange: 1-100 meters
    Bandwidth: 250 Kbit/s (very low)
    Power consumption: Very low
  23. 23What can affect network performance?Number of users, range, transmission media, bandwidth or latency.
  24. 24What is bandwidth?Amount of data that can be sent and received in a given time. Not a measure of how fast data travels but how much data can be sent. Measured in bits per second. (often called bit rate)
  25. 25What is latency?Delay from transmitting data to receiving it. Latency is caused by bottlenecks in the network infrastructure.
  26. 26What are network speeds measured in?bits per second
  27. 271 kilobit per second or 1 Kbps = ? (give answer in bits)1000 bits/sec
  28. 281 megabit per second or 1 Mbps = ?1000 Kbps/sec = 1,000,000 bits/sec
  29. 291 gigabit per second or 1 Gbps = ?1000 Mbps/sec = 1,000,000 Kbps/sec = 1,000,000,000 bits/sec
  30. 30Calculating file transfer timesCalculating file transfer times
  31. 31What is Hypertext Transfer Protocol? (HTTP)Client-server method of requesting and delivering HTML files.
  32. 32What is Hypertext Transfer Protocol Secure? (HTTPS)Encryption and authentication for client-server data.
  33. 33What is File Transfer Protocol? (FTP)Sending files between computers.
    Used for uploading web pages and associated files to a web server for hosting.
  34. 34What is Internet Message Access Protocol? (IMAP)Used by email clients to retrieve email from a mail server and manage remote mailboxes.
  35. 35What is Simple Mail Transfer Protocol? (SMTP)Sends mail to a mail server.
  36. 36What is Post Office Protocol? (POP3)Used by email clients to retrieve email from a mail server.
  37. 37What is Transmission Control Protocol? (TCP)Provides an error-free transmission between two routers (TCP).
  38. 38What is Internet Protocol? (IP)Provides routing of packets on a wide area network (IP).
  39. 39What is Post Office Protocol? (POP)Used by email clients to retrieve email from a mail server.
  40. 40What is layering?Divides complex tasks of network into smaller, simpler tasks that work together.
  41. 41Layer diagramLayer diagram
  42. 42Advantages of layering- Reduce complexity of problem
    - Devices can be manufactured to operate a particular layer
    - Products from different vendors will work together
  43. 43Star network topologyStar network topology
  44. 44Bus network topologyBus network topology
  45. 45Advantages of a star network- Performance remains consistent even when traffic load is heavy
    - If one cable fails, it will not affect other computers
    - Good level of security, data only received by computer for which it is intended for
  46. 46Disadvantages of a star network- If central switch fails, entire network goes down
    - More costly topology due to extra hardware (ie. cables and switches)
    - Connectivity issues more difficult to trace through a switch
  47. 47Advantages of a bus network- Easy and cheap topology, less cabiling
    - Not dependent on a central switch
    - No additional devices such as a switch are required
  48. 48Disadvantages of a bus network- Lower security than star topology. Every computer can see data being transmitted.
    - If main backbone bus cable fails, entire network goes down.
    - Performance slows down quickly if there is a lot of traffic across the network
  49. 49Full mesh network topologyFull mesh network topology
  50. 50Advantages of a full mesh topologyIf the switch fails, the network will still function because there is another route between the source and destination.
  51. 51Disadvantages of a full mesh topologyMore cabling and switches needed, which can be expensive and impractical for large networks.
  52. 52Partial mesh network topologyPartial mesh network topology
  53. 53Advantages of a WIRELESS mesh network topology- Fewer wires, less cost
    - Convenient
    - Will adjust to find a clear signal
    - Easy to install/uninstall, making it adaptable and expandable if more or less coverage is needed.
  54. 54Disadvantages of a WIRELESS mesh network topology- Lower bandwidth, slower than wired networks
    - Access points need to be in range of each other and the signal can be variable
    - Suffer from interference
    - Less secure due to broadcasting data packets

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GCSE Computing Karteikarten am SLR04, erstellt von Jack Piper am 29/05/2021.
Erstellt von
Jack Piper
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