CIS361 Data Communications and Networks

Review for Second Quiz

1. What is a code point?

2. Define each of these terms

  1. SOH
  2. STX
  3. EOT
  4. ACK
  5. NAK
  6. CR
  7. LF
  8. alphanumeric character
  9. control character
  10. ASCII
  11. EBCDIC
  12. compression
  13. encryption
  14. baud
  15. bps

3. What is an advantage to having more bits in your symbol system?

4. How do you calculate code efficiency?

5. Why is Unicode necessary?

6. What are the two kinds of parity? How is each kind of parity calculated?

7. Define these terms and give and example of each: simplex, half-duplex, full-duplex

8. What is the main difference between synchronous and asynchronous transmission?

9. What is meant by each term:

  1. start bit
  2. stop bit
  3. data bit
  4. serial mode
  5. parallel mode
  6. synchronization bits
  7. quantization

10. How can a modem's circuit speed be faster than its baud rate?

11. Define each term:

  1. FSK
  2. PSK
  3. modem
  4. codec
  5. sampling rate
  6. digitizing distortion
  7. message block
  8. acoustic coupler
  9. fax modem
  10. RS-232-C
  11. null modem

12. Which transmission mode has a turnaround time? Why don't the other two have one?

13. What is the difference between analog and digital signaling?

14. How long will it take to download a file whose size is 2 MB, assuming 7-bit ASCII, even parity, and a line speed of 28.8 Mbps? (Note: A Megabyte is NOT a million bytes. A kilobyte is actually 1,024 bytes, and a megabyte is 1,048,576 bytes or 1,024 kilobytes.)