AFH TEST Most Recent exam COMPLETE (2026) EXAM Questions and
Answers (Verified Answers) (Latest Update 2026) Graded A+
AFH (Adaptive Frequency Hopping) Practice Questions 1–70
1. What does AFH stand for?
• A) Automatic Frequency Handling
• B) Adaptive Frequency Hopping
• C) Advanced Frequency Handoff
• D) Active Frequency Hyperlink
Rationale: AFH is Adaptive Frequency Hopping, used to dynamically avoid interference in
wireless communications.
2. What is the primary purpose of AFH?
• A) To encrypt wireless data
• B) To reduce interference and improve reliability
• C) To increase network bandwidth
• D) To replace Wi-Fi
Rationale: AFH helps devices avoid crowded or noisy frequencies, improving connection
stability.
3. AFH is commonly associated with which wireless technology?
• A) Wi-Fi
• B) Bluetooth
• C) LTE
• D) NFC
Rationale: AFH is implemented in Bluetooth to avoid interference from Wi-Fi and other devices.
4. How does AFH identify bad channels?
• A) By guessing randomly
• B) By monitoring interference levels
• C) By scanning the internet
• D) By pinging other devices
Rationale: Devices monitor frequencies and mark those with high interference as bad channels.
EXAMPREPMASTER
, 5. What happens to frequencies marked as “bad” in AFH?
• A) They are encrypted
• B) They are skipped during hopping
• C) They are reset
• D) They are used more frequently
Rationale: AFH avoids transmitting on frequencies with high interference.
6. Which type of frequency hopping does AFH improve upon?
• A) Fixed frequency hopping
• B) Channel bonding
• C) Time division multiplexing
• D) Spread spectrum
Rationale: Traditional frequency hopping uses a fixed pattern, while AFH adapts dynamically.
7. AFH primarily operates in which frequency band for Bluetooth?
• A) 2.4 GHz ISM
• B) 5 GHz
• C) 900 MHz
• D) 60 GHz
Rationale: Bluetooth operates in the 2.4 GHz Industrial, Scientific, and Medical (ISM) band.
8. Why is interference a concern for Bluetooth devices?
• A) It can reduce battery life
• B) It can cause dropped connections
• C) It improves security
• D) It prevents pairing
Rationale: Interference can disrupt Bluetooth communication, causing packet loss and connection
issues.
9. Which metric is commonly used to detect interference in AFH?
• A) Signal-to-Noise Ratio (SNR)
• B) IP address
• C) MAC address
• D) Frequency hopping rate
Rationale: SNR helps determine if a channel is noisy or unusable.
EXAMPREPMASTER
, 10. AFH improves overall wireless performance by:
• A) Encrypting all traffic
• B) Avoiding congested frequencies
• C) Increasing transmit power
• D) Using wired connections
Rationale: AFH avoids bad channels, reducing retransmissions and improving performance.
11–20: Bluetooth and Interference Management
11. What is the typical number of channels in Bluetooth classic for AFH?
• A) 16
• B) 79
• C) 128
• D) 32
Rationale: Bluetooth classic uses 79 channels in the 2.4 GHz band for frequency hopping.
12. In BLE (Bluetooth Low Energy), how many channels are used?
• A) 40
• B) 79
• C) 20
• D) 60
Rationale: BLE uses 40 channels in the 2.4 GHz band.
13. What is a “good channel” in AFH?
• A) A channel without interference
• B) A channel reserved for Wi-Fi
• C) A deprecated channel
• D) A low-power channel
Rationale: Good channels are those suitable for reliable data transmission.
14. How often can AFH adjust its hopping sequence?
• A) Once per day
• B) Dynamically, as interference is detected
• C) Once per pairing
• D) Only on power-on
EXAMPREPMASTER
, Rationale: AFH adapts in real-time to maintain optimal connections.
15. AFH helps Bluetooth coexist with Wi-Fi primarily because:
• A) Wi-Fi uses 5 GHz
• B) Wi-Fi and Bluetooth share 2.4 GHz
• C) Wi-Fi encrypts signals
• D) Wi-Fi uses different MAC addresses
Rationale: Both operate in 2.4 GHz, so AFH avoids overlapping channels.
16. Which type of interference is most common in Bluetooth AFH?
• A) Narrowband interference
• B) Infrared interference
• C) Satellite interference
• D) None
Rationale: Bluetooth encounters narrowband interference from Wi-Fi, microwaves, and other
devices.
17. How does AFH affect packet retransmissions?
• A) Increases them
• B) Reduces them
• C) Has no effect
• D) Encrypts them
Rationale: By avoiding bad channels, AFH reduces packet loss and retransmissions.
18. Why is AFH considered adaptive?
• A) It uses a fixed schedule
• B) It adjusts based on channel conditions
• C) It randomly encrypts channels
• D) It works only once
Rationale: AFH adapts dynamically to interference patterns.
19. Which Bluetooth version first introduced AFH?
• A) Bluetooth 1.0
• B) Bluetooth 1.2
• C) Bluetooth 2.0
• D) Bluetooth 4.0
EXAMPREPMASTER
Answers (Verified Answers) (Latest Update 2026) Graded A+
AFH (Adaptive Frequency Hopping) Practice Questions 1–70
1. What does AFH stand for?
• A) Automatic Frequency Handling
• B) Adaptive Frequency Hopping
• C) Advanced Frequency Handoff
• D) Active Frequency Hyperlink
Rationale: AFH is Adaptive Frequency Hopping, used to dynamically avoid interference in
wireless communications.
2. What is the primary purpose of AFH?
• A) To encrypt wireless data
• B) To reduce interference and improve reliability
• C) To increase network bandwidth
• D) To replace Wi-Fi
Rationale: AFH helps devices avoid crowded or noisy frequencies, improving connection
stability.
3. AFH is commonly associated with which wireless technology?
• A) Wi-Fi
• B) Bluetooth
• C) LTE
• D) NFC
Rationale: AFH is implemented in Bluetooth to avoid interference from Wi-Fi and other devices.
4. How does AFH identify bad channels?
• A) By guessing randomly
• B) By monitoring interference levels
• C) By scanning the internet
• D) By pinging other devices
Rationale: Devices monitor frequencies and mark those with high interference as bad channels.
EXAMPREPMASTER
, 5. What happens to frequencies marked as “bad” in AFH?
• A) They are encrypted
• B) They are skipped during hopping
• C) They are reset
• D) They are used more frequently
Rationale: AFH avoids transmitting on frequencies with high interference.
6. Which type of frequency hopping does AFH improve upon?
• A) Fixed frequency hopping
• B) Channel bonding
• C) Time division multiplexing
• D) Spread spectrum
Rationale: Traditional frequency hopping uses a fixed pattern, while AFH adapts dynamically.
7. AFH primarily operates in which frequency band for Bluetooth?
• A) 2.4 GHz ISM
• B) 5 GHz
• C) 900 MHz
• D) 60 GHz
Rationale: Bluetooth operates in the 2.4 GHz Industrial, Scientific, and Medical (ISM) band.
8. Why is interference a concern for Bluetooth devices?
• A) It can reduce battery life
• B) It can cause dropped connections
• C) It improves security
• D) It prevents pairing
Rationale: Interference can disrupt Bluetooth communication, causing packet loss and connection
issues.
9. Which metric is commonly used to detect interference in AFH?
• A) Signal-to-Noise Ratio (SNR)
• B) IP address
• C) MAC address
• D) Frequency hopping rate
Rationale: SNR helps determine if a channel is noisy or unusable.
EXAMPREPMASTER
, 10. AFH improves overall wireless performance by:
• A) Encrypting all traffic
• B) Avoiding congested frequencies
• C) Increasing transmit power
• D) Using wired connections
Rationale: AFH avoids bad channels, reducing retransmissions and improving performance.
11–20: Bluetooth and Interference Management
11. What is the typical number of channels in Bluetooth classic for AFH?
• A) 16
• B) 79
• C) 128
• D) 32
Rationale: Bluetooth classic uses 79 channels in the 2.4 GHz band for frequency hopping.
12. In BLE (Bluetooth Low Energy), how many channels are used?
• A) 40
• B) 79
• C) 20
• D) 60
Rationale: BLE uses 40 channels in the 2.4 GHz band.
13. What is a “good channel” in AFH?
• A) A channel without interference
• B) A channel reserved for Wi-Fi
• C) A deprecated channel
• D) A low-power channel
Rationale: Good channels are those suitable for reliable data transmission.
14. How often can AFH adjust its hopping sequence?
• A) Once per day
• B) Dynamically, as interference is detected
• C) Once per pairing
• D) Only on power-on
EXAMPREPMASTER
, Rationale: AFH adapts in real-time to maintain optimal connections.
15. AFH helps Bluetooth coexist with Wi-Fi primarily because:
• A) Wi-Fi uses 5 GHz
• B) Wi-Fi and Bluetooth share 2.4 GHz
• C) Wi-Fi encrypts signals
• D) Wi-Fi uses different MAC addresses
Rationale: Both operate in 2.4 GHz, so AFH avoids overlapping channels.
16. Which type of interference is most common in Bluetooth AFH?
• A) Narrowband interference
• B) Infrared interference
• C) Satellite interference
• D) None
Rationale: Bluetooth encounters narrowband interference from Wi-Fi, microwaves, and other
devices.
17. How does AFH affect packet retransmissions?
• A) Increases them
• B) Reduces them
• C) Has no effect
• D) Encrypts them
Rationale: By avoiding bad channels, AFH reduces packet loss and retransmissions.
18. Why is AFH considered adaptive?
• A) It uses a fixed schedule
• B) It adjusts based on channel conditions
• C) It randomly encrypts channels
• D) It works only once
Rationale: AFH adapts dynamically to interference patterns.
19. Which Bluetooth version first introduced AFH?
• A) Bluetooth 1.0
• B) Bluetooth 1.2
• C) Bluetooth 2.0
• D) Bluetooth 4.0
EXAMPREPMASTER
