Moodle is the software used for this web site, including the quiz questions. When I create the questions, I also specify the acceptable answers. The answer may be in the form of a string, e.g. "Transmitter", a number, e.g. "1450" or a formula, e.g. "{size}/{rate}". Units may also be specified. The answer you give is compared against my list of acceptable answers. I try to create acceptable answers that would capture all possible correct answers, but sometimes it is not possible. Below are some hints on how to give answers to quiz questions:

Words (strings) as answers

• Case doesn't matter unless it is important in the context of the answer.
  • The source system contains the source and _____. Transmitter (correct), transmitter (correct), TRANSMITTER (correct)
  • What is the symbol for bytes? B (correct), b (incorrect)
• Spelling is important.
  
  • The source system contains the source and _____. Transmitter (correct), Transmiter (incorrect)
• Abbreviations/acronyms are usually accepted (especially for protocols), unless the full name is asked for.
  • What is the protocol used for web browsing? HTTP (correct), Hypertext Transfer Protocol (correct)

Numbers as answers

• Integers and decimals are accepted, e.g. 23, 0.005, 16.45
• Don't include commas in numbers
  • How many bits in a Mb?1000000 (correct), 1,000,000 (incorrect)
• Scientific notation is accepted (e.g. 1E06), but should be rarely used. Instead use appropriate prefixes (1M) or write the number in fill (1000000)
• Give units when necessary:
  • Use the following symbols: s, b, B, m, W, Hz, dB, min, hr
  • Use / for per, e.g. b/s (correct), bps (incorrect), b per s (incorrect)
  • Don't write the full name; instead use the above symbol. s (correct), sec (incorrect), second (incorrect)
  • Include a space between the number and unit: 100 m (correct), 100m (incorrect)
• Use appropriate prefixes:
  • Use the following prefixes (from largest to smallest): T, G, M, k, m, u, n, p
  • The prefix is written immediately before the unit, e.g. Mb, ms
  • Use the correct case for the prefix, e.g. M is Mega, m is milli
  • Although most prefixes are acceptable, try to use sensible prefixes: 10 us (good), 0.01 ms (good), 0.00001 s (acceptable), 0.000000166 min (incorrect)
• Follow the instructions in the question. If the question asks How many MB?, then you must give your answer in MB. Sometimes the question will not allow you to enter units (only a number is allowed, not text). Usually such questions contain instructions like: Give your answer in bits or the unit is indicated after the answer box.

Try the lesson on Units and Prefixes to learn more about the above.

In the case that you think your answer is correct, but it was marked wrong, let me know. I can manually grade your answer, and also improve the question/answer for other students.