Cisco CCNA 200-301 Wireless Principles Practice Test

Topic 09 focuses on Wireless Principles for the Cisco Certified Network Associate (CCNA) certification and the 200-301 exam, using Cisco networking and Cisco IOS concepts where relevant. For broader exam preparation, review the Cisco CCNA 200-301 Exam Dumps page. Each question includes a concise explanation of the correct answer and the technical reason the other choices are incorrect.

Question 1

What is a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands?

2. 2.4 GHz band
3. Channel
4. Non-overlapping channels
5. RSSI

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Incorrect Answers

Answer B is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

Answer C is incorrect because the “Non-overlapping channels” option describes a different concept: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Answer D is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 2

Which Wi-Fi band offers more channel choices and typically less legacy interference than 2.4 GHz?

1. RSSI
2. 5 GHz band
3. 2.4 GHz band
4. BSSID

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Incorrect Answers

Answer A is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer C is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer D is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

 

Question 3

What is a defined portion of radio spectrum used by a wireless network for transmission?

1. SSID
2. Channel
3. Non-overlapping channels
4. RF interference

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes a defined portion of radio spectrum used by a wireless network for transmission.

Incorrect Answers

Answer A is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer C is incorrect because the “Non-overlapping channels” option describes a different concept: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Answer D is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

 

Question 4

Which human-readable service set name is used to identify a wireless LAN to clients?

1. RSSI
2. CSMA/CA
3. SSID
4. SNR

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes the human-readable service set name used to identify a wireless LAN to clients.

Incorrect Answers

Answer A is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer B is incorrect because the “CSMA/CA” option describes a different concept: the shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

Answer D is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

 

Question 5

What is a basic service set identifier, typically based on a wireless radio interface MAC address?

1. SSID
2. Non-overlapping channels
3. BSSID
4. RF interference

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a basic service set identifier, typically based on a wireless radio interface MAC address.

Incorrect Answers

Answer A is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer B is incorrect because the “Non-overlapping channels” option describes a different concept: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Answer D is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

 

Question 6

Which term describes unwanted radio energy that can reduce wireless signal quality and throughput?

1. 5 GHz band
2. SNR
3. RF interference
4. RSSI

Correct Answer: C

 

Correct Answer

Answer C is correct because Unwanted radio energy that can reduce wireless signal quality and throughput.

Incorrect Answers

Answer A is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Answer B is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

Answer D is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 7

Which measurement represents received wireless signal strength?

2. 2.4 GHz band
3. RSSI
4. SSID
5. 5 GHz band

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes a measurement that represents received wireless signal strength.

Incorrect Answers

Answer A is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer C is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer D is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

 

Question 8

Which difference between is received signal strength and background noise, used to indicate signal quality?

1. SNR
2. Non-overlapping channels
3. 2.4 GHz band
4. 5 GHz band

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the difference between received signal strength and background noise, used to indicate signal quality.

Incorrect Answers

Answer B is incorrect because the “Non-overlapping channels” option describes a different concept: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Answer C is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer D is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

 

Question 9

Which shared-medium access method is used by Wi-Fi to reduce the likelihood of collisions?

1. SNR
2. SSID
3. CSMA/CA
4. 5 GHz band

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes the shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

Incorrect Answers

Answer A is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

Answer B is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer D is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

 

Question 10

Which term describes channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference?

1. BSSID
2. SSID
3. CSMA/CA
4. Non-overlapping channels

Correct Answer: D

 

Correct Answer

Answer D is correct because Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Incorrect Answers

Answer A is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

Answer B is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer C is incorrect because the “CSMA/CA” option describes a different concept: the shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

 

Question 11

For 2.4 GHz band, which statement is accurate?

1. A measurement that represents received wireless signal strength.
2. A defined portion of radio spectrum used by a wireless network for transmission.
3. The human-readable service set name used to identify a wireless LAN to clients.
4. A Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Correct Answer: D

 

Correct Answer

Answer D is correct because it accurately defines 2.4 GHz band. The matching definition is: A Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Incorrect Answers

Answer A is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer B is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

Answer C is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

 

Question 12

For 5 GHz band, which statement is accurate?

2. A Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.
3. A Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.
4. Unwanted radio energy that can reduce wireless signal quality and throughput.
5. A measurement that represents received wireless signal strength.

Correct Answer: A

 

Correct Answer

Answer A is correct because the choice accurately describes 5 GHz band: A Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Incorrect Answers

Answer B is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer C is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer D is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 13

For Channel, which statement is accurate?

1. Unwanted radio energy that can reduce wireless signal quality and throughput.
2. A measurement that represents received wireless signal strength.
3. A defined portion of radio spectrum used by a wireless network for transmission.
4. A basic service set identifier, typically based on a wireless radio interface MAC address.

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a defined portion of radio spectrum used by a wireless network for transmission.

Incorrect Answers

Answer A is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer B is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer D is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

 

Question 14

For SSID, which statement is accurate?

1. A basic service set identifier, typically based on a wireless radio interface MAC address.
2. A Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.
3. The human-readable service set name used to identify a wireless LAN to clients.
4. A measurement that represents received wireless signal strength.

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes the human-readable service set name used to identify a wireless LAN to clients.

Incorrect Answers

Answer A is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

Answer B is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer D is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 15

For BSSID, which statement is accurate?

1. A basic service set identifier, typically based on a wireless radio interface MAC address.
2. The difference between received signal strength and background noise, used to indicate signal quality.
3. A defined portion of radio spectrum used by a wireless network for transmission.
4. A Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Correct Answer: A

 

Correct Answer

Answer A is correct because it accurately defines BSSID. The matching definition is: A basic service set identifier, typically based on a wireless radio interface MAC address.

Incorrect Answers

Answer B is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

Answer C is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

Answer D is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

 

Question 16

For RF interference, which statement is accurate?

1. Unwanted radio energy that can reduce wireless signal quality and throughput.
2. A basic service set identifier, typically based on a wireless radio interface MAC address.
3. The difference between received signal strength and background noise, used to indicate signal quality.
4. A defined portion of radio spectrum used by a wireless network for transmission.

Correct Answer: A

 

Correct Answer

Answer A is correct because the choice accurately describes RF interference: Unwanted radio energy that can reduce wireless signal quality and throughput.

Incorrect Answers

Answer B is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

Answer C is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

Answer D is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

 

Question 17

For RSSI, which statement is accurate?

1. The difference between received signal strength and background noise, used to indicate signal quality.
2. A measurement that represents received wireless signal strength.
3. The shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.
4. A Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes a measurement that represents received wireless signal strength.

Incorrect Answers

Answer A is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

Answer C is incorrect because the “CSMA/CA” option describes a different concept: the shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

Answer D is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

 

Question 18

For SNR, which statement is accurate?

1. The difference between received signal strength and background noise, used to indicate signal quality.
2. Unwanted radio energy that can reduce wireless signal quality and throughput.
3. The human-readable service set name used to identify a wireless LAN to clients.
4. A measurement that represents received wireless signal strength.

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the difference between received signal strength and background noise, used to indicate signal quality.

Incorrect Answers

Answer B is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer C is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer D is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 19

For CSMA/CA, which statement is accurate?

2. A Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.
3. The shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.
4. Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.
5. A basic service set identifier, typically based on a wireless radio interface MAC address.

Correct Answer: B

 

Correct Answer

Answer B is correct because it accurately defines CSMA/CA. The matching definition is: The shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

Incorrect Answers

Answer A is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Answer C is incorrect because the “Non-overlapping channels” option describes a different concept: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Answer D is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

 

Question 20

For Non-overlapping channels, which statement is accurate?

1. Unwanted radio energy that can reduce wireless signal quality and throughput.
2. Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.
3. A basic service set identifier, typically based on a wireless radio interface MAC address.
4. A measurement that represents received wireless signal strength.

Correct Answer: B

 

Correct Answer

Answer B is correct because the choice accurately describes Non-overlapping channels: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Incorrect Answers

Answer A is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer C is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

Answer D is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 21

During a network fundamentals assessment, the design calls for the following capability: A Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands. Which option names that capability most accurately?

1. SSID
2. SNR
3. RSSI
4. 2.4 GHz band

Correct Answer: D

 

Correct Answer

Answer D is correct because 2.4 GHz band is the most precise fit for the stated requirement. A Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Incorrect Answers

Answer A is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer B is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

Answer C is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

 

Question 22

A WLAN design prioritizes additional channel choices and avoiding common legacy 2.4 GHz interference. Which listed radio band best supports those priorities?

1. 5 GHz band
2. 2.4 GHz band
3. Channel
4. SSID

Correct Answer: A

 

Correct Answer

Answer A is correct because the scenario is describing the role of 5 GHz band. A Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Incorrect Answers

Answer B is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer C is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

Answer D is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

 

Question 23

While working on a basic LAN troubleshooting session, an administrator encounters this requirement: A defined portion of radio spectrum used by a wireless network for transmission. Which answer is the most precise match?

1. RF interference
2. 2.4 GHz band
3. SSID
4. Channel

Correct Answer: D

 

Correct Answer

Answer D is correct because Channel directly provides the function required by the scenario. A defined portion of radio spectrum used by a wireless network for transmission.

Incorrect Answers

Answer A is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer B is incorrect because the “2.4 GHz band” option describes a different concept: a Wi-Fi band with relatively few non-overlapping channels and generally greater range than higher-frequency bands.

Answer C is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

 

Question 24

In a new branch deployment, the team must identify the technology that provides the following function: The human-readable service set name used to identify a wireless LAN to clients. Which option should be selected?

1. RSSI
2. CSMA/CA
3. Channel
4. SSID

Correct Answer: D

 

Correct Answer

Answer D is correct because the operational requirement in the stem maps to SSID: The human-readable service set name used to identify a wireless LAN to clients.

Incorrect Answers

Answer A is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer B is incorrect because the “CSMA/CA” option describes a different concept: the shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

Answer C is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

 

Question 25

A wireless capture must distinguish two basic service sets that advertise the same network name. Which identifier, normally derived from a radio interface MAC address, distinguishes them?

1. BSSID
2. RF interference
3. 5 GHz band
4. CSMA/CA

Correct Answer: A

 

Correct Answer

Answer A is correct because BSSID is the most precise fit for the stated requirement. A basic service set identifier, typically based on a wireless radio interface MAC address.

Incorrect Answers

Answer B is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer C is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

Answer D is incorrect because the “CSMA/CA” option describes a different concept: the shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

 

Question 26

During a network fundamentals assessment, the design calls for the following capability: Unwanted radio energy that can reduce wireless signal quality and throughput. Which option names that capability most accurately?

1. RSSI
2. SSID
3. 5 GHz band
4. RF interference

Correct Answer: D

 

Correct Answer

Answer D is correct because the scenario is describing the role of RF interference. Unwanted radio energy that can reduce wireless signal quality and throughput.

Incorrect Answers

Answer A is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer B is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer C is incorrect because the “5 GHz band” option describes a different concept: a Wi-Fi band that offers more channel choices and typically less legacy interference than 2.4 GHz.

 

Question 27

An engineer moves away from an access point and observes a declining received-signal-strength measurement. Which metric is being monitored?

1. BSSID
2. RSSI
3. Channel
4. Non-overlapping channels

Correct Answer: B

 

Correct Answer

Answer B is correct because RSSI directly provides the function required by the scenario. A measurement that represents received wireless signal strength.

Incorrect Answers

Answer A is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

Answer C is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

Answer D is incorrect because the “Non-overlapping channels” option describes a different concept: Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

 

Question 28

While working on a basic LAN troubleshooting session, an administrator encounters this requirement: The difference between received signal strength and background noise, used to indicate signal quality. Which answer is the most precise match?

1. RF interference
2. RSSI
3. SNR
4. Channel

Correct Answer: C

 

Correct Answer

Answer C is correct because the operational requirement in the stem maps to SNR: The difference between received signal strength and background noise, used to indicate signal quality.

Incorrect Answers

Answer A is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer B is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer D is incorrect because the “Channel” option describes a different concept: a defined portion of radio spectrum used by a wireless network for transmission.

 

Question 29

In a new branch deployment, the team must identify the technology that provides the following function: The shared-medium access method used by Wi-Fi to reduce the likelihood of collisions. Which option should be selected?

1. SSID
2. CSMA/CA
3. BSSID
4. SNR

Correct Answer: B

 

Correct Answer

Answer B is correct because CSMA/CA is the most precise fit for the stated requirement. The shared-medium access method used by Wi-Fi to reduce the likelihood of collisions.

Incorrect Answers

Answer A is incorrect because the “SSID” option describes a different concept: the human-readable service set name used to identify a wireless LAN to clients.

Answer C is incorrect because the “BSSID” option describes a different concept: a basic service set identifier, typically based on a wireless radio interface MAC address.

Answer D is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.

 

Question 30

Neighboring access points are assigned channels whose frequency use does not substantially overlap. Which channel-planning approach is being applied?

1. RSSI
2. RF interference
3. SNR
4. Non-overlapping channels

Correct Answer: D

 

Correct Answer

Answer D is correct because the scenario is describing the role of Non-overlapping channels. Channels selected so their spectral use does not significantly overlap, reducing co-channel or adjacent-channel interference.

Incorrect Answers

Answer A is incorrect because the “RSSI” option describes a different concept: a measurement that represents received wireless signal strength.

Answer B is incorrect because the “RF interference” option describes a different concept: Unwanted radio energy that can reduce wireless signal quality and throughput.

Answer C is incorrect because the “SNR” option describes a different concept: the difference between received signal strength and background noise, used to indicate signal quality.