CompTIA Network+ Certification (N10-003) Part 7
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30 CompTIA Network+ questions covering wireless technology and MAC addresses.
- 1.
At what radio frequency does Bluetooth operate?
- A.
2.4 GHz
- B.
5.0 GHz
- C.
5.4 GHz
- D.
10 GHz
Correct Answer
A. 2.4 GHzExplanation
Bluetooth uses the 2.4 GHz band.Rate this question:
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- 2.
At what radio frequency does an IEEE 802.11b wireless network operate?
- A.
2.4 GHz
- B.
5.0 GHz
- C.
5.4 GHz
- D.
10 GHz
Correct Answer
A. 2.4 GHzExplanation
IEEE 802.11b and IEEE 802.11g use the 2.4 GHz frequency band.Rate this question:
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- 3.
Your company has aquired a new IEEE 802.11g wireless access point (WAP). What is the maximum transmission speed supported by this WAP?
- A.
720 Kbps
- B.
2 Mbps
- C.
11 Mbps
- D.
54 Mbps
Correct Answer
D. 54 MbpsExplanation
IEEE 802.11g has a transmission speed of up to 54 Mbps.Rate this question:
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- 4.
Bluetooth 1.1 has a maximum transmission speed of ____ while Bluetooth 2.0 has a maximum transmission speed of _____ (select two).
- A.
720 Kbps
- B.
2 Mbps
- C.
2.1 Mbps
- D.
11 Mbps
- E.
45 Mbps
Correct Answer(s)
A. 720 Kbps
C. 2.1 MbpsExplanation
The origninal Bluetooth standard (V1.1) was designed to achieve a maximum theoretical throughput of 1 Mbps. However, its effective throughput is 723 Kbps, with error correction and control data consuming the remaining bandwidth. The latest version of the standard (versino 2.0) was released in 2004. This version uses different encoding schemes that allow Bluetooth to achieve up to 2.1 Mbps throughput.Rate this question:
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- 5.
IEEE 802.11b can transmit data at a rate up to _____.
- A.
2 Mbps
- B.
11 Mbps
- C.
54 Mbps
- D.
100 Mbps
Correct Answer
B. 11 MbpsExplanation
IEEE 802.11b has a transmission speed of up to 11 Mbps.Rate this question:
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- 6.
What is the maximum transmission speed of IrDA 1.1?
- A.
720 Kbps
- B.
2 Mbps
- C.
4 Mbps
- D.
11 Mbps
Correct Answer
C. 4 MbpsExplanation
IrDA 1.1 has a transmission speed of up to 4 Mbps.Rate this question:
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- 7.
What is the maximum transmission speed supported by IEEE 802.11a?
- A.
720 Kbps
- B.
2 Mbps
- C.
11 Mbps
- D.
54 Mbps
Correct Answer
D. 54 MbpsExplanation
802.11a is an extension to 802.11 that applies to wireless LANs and provides up to 54 Mbps in the 5 GHz band. It uses an othogonal frequency division multiplexing encoding scheme rather than FHSS or DSSS.Rate this question:
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- 8.
What is the maximum range of IrDA 1.1?
- A.
1 meter
- B.
11 meters
- C.
10 meters
- D.
25 meters
Correct Answer
A. 1 meterExplanation
IrDA has a maximum range of 1 meter (3 feet).Rate this question:
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- 9.
Which of the following wireless networks operate in the 5.0 GHz radio frequency band?
- A.
Bluetooth
- B.
IEEE 802.11a
- C.
IEEE 802.11b
- D.
IEEE 802.11g
Correct Answer
B. IEEE 802.11aExplanation
IEEE 802.11a uses the 5 GHz frequency band.Rate this question:
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- 10.
Which of the following statements regarding wireless networking is true?
- A.
Both IEEE 802.11b and IEEE 802.11g operate in the 2.4 GHz radio frequency band while Bluetooth operates at 5.0 GHz
- B.
IEEE 802.11a operates in the 2.4 GHz radio frequency band and has a maximum transmission speed of 11 Mbps
- C.
Both Bluetooth and IEEE 802.11g operates at the 2.4GHz radio frequency band but Bluetooth does not interfere with IEEE 802.11g because it uses a frequency hopping spread spectrum signaling method while IEEE 802.11g uses a direct sequency spread spectrum signaling method
- D.
IEEE 802.11a and IEEE 802.11b are compatible because they operate at the same 2.4 GHz radio frequency band
Correct Answer
C. Both Bluetooth and IEEE 802.11g operates at the 2.4GHz radio frequency band but Bluetooth does not interfere with IEEE 802.11g because it uses a frequency hopping spread spectrum signaling method while IEEE 802.11g uses a direct sequency spread spectrum signaling methodExplanation
Bluetooth and IEEE 802.11g use different spread spectrum signaling methods which prevent interference between the two. Bluetooth uses the frequency hopping spread spectrum (FHSS) signaling method while IEEE 802.11g uses a direct sequency spread spectrum (DSSS).Rate this question:
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- 11.
Which of the following uses Orthogonal Frequency Division Multiplexing (OFDM)?
- A.
Bluetooth
- B.
IEEE 802.11a
- C.
IEEE 802.11b
- D.
IEEE 802.11g
Correct Answer
B. IEEE 802.11aExplanation
IEEE 802.11a uses OFDM.Rate this question:
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- 12.
Which of the following uses the 2.4 GHz radio frequency band and Frequency Hopping Spread Spectrum (FHSS)?
- A.
Bluetooth
- B.
IEEE 802.11a
- C.
IEEE 802.11b
- D.
IEEE 802.11g
Correct Answer
A. BluetoothExplanation
Bluetooth uses the 2.4 GHz radio frequency band and FHSS.Rate this question:
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- 13.
Which of the following wireless networks are compatible?
- A.
IEEE 802.11a and IEEE 802.11b
- B.
IEEE 802.11a and IEEE 802.11g
- C.
IEEE 802.11b and IEEE 802.11g
- D.
IEEE 802.11a, IEEE 802.11b and IEEE 802.11g
Correct Answer
C. IEEE 802.11b and IEEE 802.11gExplanation
IEEE 802.11b and IEEE 802.11g are interoperable as they both use the 2.4 GHz frequency band.Rate this question:
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- 14.
Which of the following does not operate in the 2.4 GHz radio frequency band?
- A.
IEEE 802.11
- B.
IEEE 802.11a
- C.
IEEE 802.11b
- D.
IEEE 802.11g
Correct Answer
B. IEEE 802.11aExplanation
IEEE 802.11a uses the 5 GHz frequency band.Rate this question:
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- 15.
Your network has an IEEE 802.11b wireless network interface card (NIC). Which of the following devices would be compatible with this NIC?
- A.
Bluetooth devices
- B.
Only IEEE 802.11a devices
- C.
Only IEEE 802.11g devices
- D.
IEEE 802.11a and IEEE 802.11g devices
Correct Answer
C. Only IEEE 802.11g devicesExplanation
IEEE 802.11b and IEEE 802.11g are interoperable as they both use the 2.4 GHz frequency band.Rate this question:
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- 16.
IrDA uses _______.
- A.
The 2.4 GHz radio frequency band
- B.
The 2.5 GHz radio frequency band
- C.
The 5.0 GHz radio frequency band
- D.
Infrared light beams
Correct Answer
D. Infrared light beamsExplanation
Infrared Data Association (IrDA) uses infrared light beams.Rate this question:
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- 17.
Which of the following statements is true regarding the difference between Yagi and Omni antennas?
- A.
Omni antennas have a longer range than Yagi antennas because Omni antennas disperse their signal in all directions while Yagi antennas focus their signal in a single direction
- B.
Yagi antennas have a longer range and a better coverage area than Omni antennas
- C.
Yagi antennas have a better coverage than Yagi antennas and are the better choice for wireless access points
- D.
Yagi antennas must be correctly aligned because they focus their signal in a single direction
Correct Answer
D. Yagi antennas must be correctly aligned because they focus their signal in a single directionExplanation
Yagi antennas have a longer range than the equivalent Omni antenna because the Yagi antenna focuses its signal in a single direction. For this reason, the Yagi antenna must be correctly aligned.Rate this question:
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- 18.
Your company has recently added a new wing to its headquarters building and you are asked to extend coverage of the current wireless network. Which of the following should you do?
- A.
Align the antennas on the wireless hosts in the new wing
- B.
Use IEEE 802.11a equipment on the wireless hosts in the new wing
- C.
Add Wireless Access Points to cover the area in new wing
- D.
Use Yagi antennas
Correct Answer
C. Add Wireless Access Points to cover the area in new wingExplanation
The coverage area of a wirless network can be increased by placing additional WAPs in the buildingRate this question:
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- 19.
Which of the following would interfere with an IEEE 802.11g wireless network?
- A.
Walls
- B.
Bluetooth devices
- C.
Microwave ovens
- D.
IEEE 802.11a devices
Correct Answer(s)
A. Walls
C. Microwave ovensExplanation
Walls interfere with all wireless networks. The more walls a wireless signal has to pass through, the greate the amount of signal loss. Microwave ovens also use the unlicensed 2.4 GHz radio frequency band and could interfere with an IEEE 802.11g wireless network.Rate this question:
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- 20.
Which of the following would not interfere with an IEEE 802.11g wireless network?
- A.
Walls
- B.
Bluetooth devices
- C.
Microwave ovens
- D.
IEEE 802.11a devices
Correct Answer(s)
B. Bluetooth devices
D. IEEE 802.11a devicesExplanation
Bluetooth uses a different spread spectrum signaling method than IEEE 802.11g. IEEE 802.11a devices operate at the 5.0 GHz radio frequency while IEEE 802.11g uses the 2.4 GHz band.Rate this question:
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- 21.
In which situation would Yagi antennas most likely be used?
- A.
To connect hosts to a Wireless Access Point
- B.
To enable roaming access for laptop users
- C.
To bridge two Wireless Access Points
- D.
Indoors
Correct Answer
C. To bridge two Wireless Access PointsExplanation
Yagi antennas focus signal in a single direction and require correct alignment. These antennas are typically used outdoors to bridge two WAPs.Rate this question:
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- 22.
In which situation would Omni antennas be best suited? (choose all that apply)
- A.
To connect hosts to Wireless Access Points
- B.
To enable roaming access for laptop users
- C.
To bridge two Wireless Access Points
- D.
To connect two buildings
Correct Answer(s)
A. To connect hosts to Wireless Access Points
B. To enable roaming access for laptop usersExplanation
Omni antennas disperse their signal in all directions and are therefore best suited to connect hosts to WAPs.Rate this question:
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- 23.
What do the first three sets of hexadecimal digits of a MAC represent?
- A.
Organizationally Unique Identifier (OUI)
- B.
Security Set Identifier (SSID)
- C.
Burned-In Address (BIA)
- D.
The Device ID
Correct Answer
A. Organizationally Unique Identifier (OUI)Explanation
A MAC address consists of an Organizationally Unique Identifier (OUI), which uniquely identifies the manufacturer of the interface and a device ID which identifies the interface itself. The first three hexadecimal sets of digits represent the OUI while the last three sets of digits represent the device ID.Rate this question:
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- 24.
What do the last three sets of hexadecimal digits of a MAC represent?
- A.
Organizationally Unique Identifier (OUI)
- B.
Security Set Identifier (SSID)
- C.
Burned-In Address (BIA)
- D.
The Device ID
Correct Answer
D. The Device IDExplanation
A MAC address consists of an Organizationally Unique Identifier (OUI), which uniquely identifies the manufacturer of the interface and a device ID which identifies the interface itself. The first three hexadecimal sets of digits represent the OUI while the last three sets of digits represent the device ID.Rate this question:
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- 25.
In the MAC address 00:04:23:d2:ee:f4, what is the device identifier?
- A.
00:04
- B.
00:04:23
- C.
88:ee:d4
- D.
00:04:23:d2:ee:f4
- E.
D2:ee:f4
Correct Answer
E. D2:ee:f4Explanation
A MAC address consists of an Organizationally Unique Identifier (OUI), which uniquely identifies the manufacturer of the interface and a device ID which identifies the interface itself. The first three hexadecimal sets of digits represent the OUI while the last three sets of digits represent the device ID.Rate this question:
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- 26.
In the MAC address 00:04:23:d2:ee:f4, what is the Organizationally Unique Identifier (OUI)?
- A.
00:04
- B.
00:04:23
- C.
88:ee:d4
- D.
00:04:23:d2:ee:f4
- E.
D2:ee:f4
Correct Answer
B. 00:04:23Explanation
A MAC address consists of an Organizationally Unique Identifier (OUI), which uniquely identifies the manufacturer of the interface and a device ID which identifies the interface itself. The first three hexadecimal sets of digits represent the OUI while the last three sets of digits represent the device ID.Rate this question:
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- 27.
Which of the following statements is true?
- A.
MAC addresses and private IP addresses are globally unique while public IP addresses are not
- B.
MAC addresses and IP addresses are assigned by the manufacturer of a device and cannot be changed
- C.
MAC addresses are 48-bit values while IP addresses are 32-bit values
- D.
The first half of a MAC address is the network identifier and the second half is the device identifier
Correct Answer
C. MAC addresses are 48-bit values while IP addresses are 32-bit valuesExplanation
A MAC address is a 48-bit value that is commonly represented as a 12-digit hexadecimal number while IP address are 32-bit values commonly represented as a four part decimal numberRate this question:
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- 28.
Which of the following is a valid MAC address?
- A.
192.168.1.32
- B.
255.255.255.224
- C.
00:04:23:d2:ee:h4
- D.
00:04:23:d2:ee:f4
Correct Answer
D. 00:04:23:d2:ee:f4Explanation
A MAC address is a 48-bit value that is commonly represented as a 12-digit hexadecimal number. Hexadecimal numbering is 16 Base and uses all digits from 0 through 9 as well as A through F. Each two-digit set is separated by colons or a dash.Rate this question:
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- 29.
Which of the following is not a valid MAC address?
- A.
00:04:23:d2:ee:f4
- B.
00-04-23-92-55-64
- C.
00-04-23-d2-ee-h4
- D.
00-04-23-D2-EE-F4
Correct Answer
C. 00-04-23-d2-ee-h4Explanation
A MAC address is a 48-bit value that is commonly represented as a 12-digit hexadecimal number. Hexadecimal numbering is 16 Base and uses all digits from 0 through 9 as well as A through F. Each two-digit set is separated by colons or a dash.Rate this question:
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- 30.
Which of the following statements regarding a MAC address is false?
- A.
A MAC address is a 48-bit value that is commonly represented as a 12-digit hexadecimal number
- B.
The MAC address is permanently embedded in a ROM chip on the device and is also referred to as the Burned-In Address (BIA)
- C.
The first half of a MAC address uniquely identifies the manufacturer of the device and is referred to as the Organizationally Unique Identifier (OUI) while the second half of the MAC address uniquely identifies the device
- D.
MAC addresses are not globally unique as manufacturers can assign the same Ogranizationally Unique Identifier (OUI) to more than one device
Correct Answer
D. MAC addresses are not globally unique as manufacturers can assign the same Ogranizationally Unique Identifier (OUI) to more than one deviceExplanation
In a MAC address, the Organizationally Unique Identifier (OUI) identifies the manufacturer and is the same on all MAC addresses of devices produced by that manufacturer. The manufacturer also assigns a unique Device ID to each device that it manufactures, ensuring that each device has a globally unique MAC address.Rate this question:
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