Quiz #6: Networks and Telecommunications

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  1. The term bps stands for ________ ________ ________. Answer bits per second
  2. EMI stands for ________ ________ ________. Answer Electromagnetic Interference
  3. RFI stands for ________ ________ ________. Answer Radio Frequency Interference
  4. BPL stands for ________ ________ ________. Answer Broadband over Power Lines
  5. VOIP stands for ________ ________ ________. Answer Voice Over IP
  6. LAN stands for ________ ________ ________. Answer Local Area Network
  7. MAN stands for ________ ________ ________. Answer Metropolitan Area Network
  8. WAN stands for ________ ________ ________. Answer Wide Area Network
  9. PAN stands for ________ ________ ________. Answer Personal Area Network
  10. VAN stands for ________ ________ ________. Answer Value Added Network
  11. ISP stands for ________ ________ ________. Answer Internet Service Provider
  12. EDI stands for ________ ________ ________. Answer Electronic Data Interchange
  13. VPN stands for ________ ________ ________. Answer Virtual Private Network
  14. NIC stands for ________ ________ ________. Answer Network Interface Card
  15. WAP stands for ________ ________ ________. Answer Wireless Access Point
  16. DNS stands for ________ ________ ________. Answer Domain Name System
  17. URL stands for ________ ________ ________. Answer Uniform Resource Locator
  18. DSL stands for ________ ________ ________. Answer Digital Subscriber Line

    19. Short answer

  19. List four advantages of using modern telecommunications in business. Answer Here are seven:
    • improves business communication
    • enables greater efficiency
    • improves distribution of data
    • instant transactions
    • helps create a flexible and mobile workforce
    • enables alternative channels, such as telephone via Internet
    • makes it easy to move jobs overseas where labor is cheaper
  20. What is bandwidth? Answer Bandwidth is how fast data is communicated. It is usually measured in bits per second (bps).
  21. What is transmission rate? Answer Transmission rate is how fast data is communicated. It is usually measured in bits per second (bps).
  22. How long would it take to transmit a 1GB file over a connection with a 3Mbps transfer rate? Answer There are 8 bits per byte, and we can assume about 2 bits per byte extra for transmission protocol overhead, so the total number of bits to transmit is 1,000,000,000 * (8 + 2), or 10 billion. If the transmission speed is 3,000,000 bits per second, the approximate transmission time will be 10,000,000,000 bits / (3,000,000 bits / second). That is about 3333.33 seconds, which is about fifty-six minutes, so about an hour.
  23. List three kinds of networking media and their characteristics. Answer Here are seven:
    • twisted pair: high availability (land line phones), low to medium bandwidth, vulnerable to EMI, generally high reliability
    • radio waves: high availability, medium to high bandwidth, vulnerable to RFI
    • satellite: high availability, medium to high bandwidth (but often low bandwidth due to artificial limits created by provider), vulnerable to weather conditions such as clouds and wind, reliability can be a problem
    • microwave: low availability, high bandwidth, not very vulnerable to EMI or RFI
    • coaxial: high availability (cable TV), not very vulnerable to EMI or RFI, reliability often poor, high bandwidth theoretically (but companies like Comcast purposely slow down and interfere with transmissions so users can't actually achieve high bandwidth for long)
    • optical fiber: moderate availability (purposely limited by cable and phone companies), very high bandwidth, not vulnerable to EMI or RFI
    • electric power lines (BPL): theoretically high availability (but have fun trying to find any provider locally), high bandwidth, very vulnerable to EMI
  24. What is Ethernet? Answer It is the protocol used by most local area networks.
  25. What is encryption? Answer Encryption is turning a message into a special code to make it harder to read.
  26. What are some advantages and disadvantages of telecommuting? Answer
    • saves time (no commute)
    • saves money (no commute, company doesn't have to provide as much infrastructure such as office space)
    • employees are expected to be more available (and often do work longer and more unusual hours)
    • other parts of the economy may suffer (less gas used, fewer business lunches, less office space needed, etc.)
    • easier to move jobs out of country

    27. Matching

    Identify the letter of the choice that best matches the phrase or definition.

    1. node
    2. media
    3. network
    4. hub
    5. switch
    6. bridge
    7. router
    8. repeater
    9. packet
    10. circuit switching
    11. packet switching
    12. protocol
    13. client
    14. server
    15. modem
  27. a combination of connected devices which can communicate Answer C (network)
  28. converts signals from analog to digital and vice versa Answer O (modem)
  29. direct connection is made between sender and receiver so data can be transmitted Answer J (circuit switching)
  30. a group of bits which are transmitted together Answer I (packet)
  31. used to connect dissimilar networks Answer G (router)
  32. used to regenerate signals on long distance runs Answer H (repeater)
  33. a more intelligent version of a hub Answer E (switch)
  34. a device attached to a network Answer A (node)
  35. rules used to establish and maintain communication Answer L (protocol)
  36. a machine or software that is fulfilling requests Answer N (server)
  37. used to connect similar networks Answer F (bridge)
  38. allows several devices to connect together Answer D (hub)
  39. what the data travels over/through within a network Answer B (media)
  40. messages are broken into pieces and sent into network to be reassembled at receiving end Answer K (packet switching)
  41. a machine or software that is requesting a service Answer M (client)