Practical SDR Attacks GAWN Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   You are using an SDR with a 14-bit ADC and a maximum sample rate of 10 MS/s. You need to capture a signal with a bandwidth of 5 MHz. However, you notice that the signal is distorted and you suspect aliasing. What is the most likely cause?

   • AThe signal is too weak; you need a low-noise amplifier.
   • BThe ADC resolution is too low; you need a 16-bit ADC.
   • CThe center frequency is incorrect; you need to tune to the signal's exact frequency.
   • DThe sample rate is too low; you need at least 10 MS/s, but the anti-aliasing filter is not steep enough.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   You are performing a wireless security assessment for a client. You plan to use SDR to test the client's wireless devices. Which practice best aligns with legal and ethical boundaries?

   • AUse a high-gain antenna to ensure the signal reaches only the client's devices.
   • BPerform the tests only after business hours to minimize disruption.
   • CObtain written authorization from the client that explicitly lists the frequencies, devices, and attack types permitted.
   • DUse only passive monitoring to avoid any legal issues.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   You are reverse engineering a proprietary wireless protocol. You have captured many packets and notice that the first 8 bits are always the same, followed by a 16-bit value that increments by one each packet. What is the most likely purpose of these fields?

   • AHeader and payload
   • BSync word and length
   • CAddress and CRC
   • DPreamble and packet counter
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   An analyst is trying to identify the modulation type of an unknown signal. The analyst has captured the IQ data and wants to determine whether the signal is amplitude-modulated (AM) or frequency-modulated (FM). Which observation would most clearly indicate FM?

   • AThe signal shows periodic amplitude spikes.
   • BThe instantaneous frequency varies while the amplitude remains relatively constant.
   • CThe signal has a constant frequency and amplitude.
   • DThe amplitude varies significantly while the frequency remains constant.
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   Which of the following is a common technique used to identify the modulation type of a captured wireless signal during protocol reverse engineering?

   • AMeasuring the signal's absolute power level
   • BCounting the number of packets per second
   • CExamining the constellation diagram
   • DChecking the MAC address of the transmitter
   Reveal Solution Discussion Select an answer first