Chapter 4 Active Wireless Attacks

1. (c) Each of the following is a type of filter except passband.

2. (a) A mixer combines two inputs to create a single output.

3. (c) A amplifier actively increases a signal's intensity or strength.

4. (a) The result of using PN code is to add a unique address to the signal.

5. (d) Packet switching is applicable to transmissions where the information is broken up into smaller units.

6. (True) A passband is both a minimum and maximum threshold.

7. (False) The resulting output from the modulation process is known as the middle frequency (MF) signal. 

8. (True) the sum and the differences are known as the sidebands of the frequency carrier. 

9. (False) TDMA can carry three times the amount data the CDMA can. 

10. (True) Without switching, 1225 cables would be required to interconnect 50 telephones.

11. (False) When using the same antenna for full-duplex communications, the same frequency can be used for transmitting and receiving simultaneously.

12. Switching divides the bandwidth of the frequency into several narrower frequencies.

13. When signals are sent at frequencies that are closely grouped together, and errant signal may encroach on a close frequency, causing crosstalk.

14. TDMA divides the bandwidth into several time slots.

15. A CDMA transmission uses spread spectrum technology and unique digital spreading codes.

16. Simplex is a one way direction of transmission - broadcast television is an example.

Half-duplex - A transmission that occurs in both directions but only one way at a time. A walkie talkie is an example.

Full - duplex - A transmission that enable data to flow in either direction simultaneously. A telephone is an example.

17. The advantages of standards are vendor compatibility, they create competition, the lower the cost of technology, will protect the consumer’s investment and create a migration path. 

18. Switching is moving from one wire or frequency to another. Circuit switching allows...