CompTIA Network+ Certification (N10-003) Part 7

1. What do the first three sets of hexadecimal digits of a MAC represent?

Organizationally Unique Identifier (OUI)

Security Set Identifier (SSID)

Burned-In Address (BIA)

The Device ID

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.

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.

2. At what radio frequency does an IEEE 802.11b wireless network operate?

2.4 GHz

5.0 GHz

5.4 GHz

10 GHz

IEEE 802.11b and IEEE 802.11g use the 2.4 GHz frequency band.

Explanation

IEEE 802.11b and IEEE 802.11g use the 2.4 GHz frequency band.

3. Which of the following is a valid MAC address?

192.168.1.32

255.255.255.224

00:04:23:d2:ee:h4

00:04:23:d2:ee:f4

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.

Explanation

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.

4. In the MAC address 00:04:23:d2:ee:f4, what is the Organizationally Unique Identifier (OUI)?

00:04

00:04:23

88:ee:d4

00:04:23:d2:ee:f4

D2:ee:f4

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.

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.

5. At what radio frequency does Bluetooth operate?

2.4 GHz

5.0 GHz

5.4 GHz

10 GHz

Bluetooth uses the 2.4 GHz band.

Explanation

Bluetooth uses the 2.4 GHz band.

6. IrDA uses _______.

The 2.4 GHz radio frequency band

The 2.5 GHz radio frequency band

The 5.0 GHz radio frequency band

Infrared light beams

Infrared Data Association (IrDA) uses infrared light beams.

Explanation

Infrared Data Association (IrDA) uses infrared light beams.

7. Your company has aquired a new IEEE 802.11g wireless access point (WAP). What is the maximum transmission speed supported by this WAP?

720 Kbps

2 Mbps

11 Mbps

54 Mbps

IEEE 802.11g has a transmission speed of up to 54 Mbps.

Explanation

IEEE 802.11g has a transmission speed of up to 54 Mbps.

8. What do the last three sets of hexadecimal digits of a MAC represent?

Organizationally Unique Identifier (OUI)

Security Set Identifier (SSID)

Burned-In Address (BIA)

The Device ID

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.

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.

9. Which of the following wireless networks operate in the 5.0 GHz radio frequency band?

Bluetooth

IEEE 802.11a

IEEE 802.11b

IEEE 802.11g

IEEE 802.11a uses the 5 GHz frequency band.

Explanation

IEEE 802.11a uses the 5 GHz frequency band.

10. 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?

Align the antennas on the wireless hosts in the new wing

Use IEEE 802.11a equipment on the wireless hosts in the new wing

Add Wireless Access Points to cover the area in new wing

Use Yagi antennas

The coverage area of a wirless network can be increased by placing additional WAPs in the building

Explanation

The coverage area of a wirless network can be increased by placing additional WAPs in the building

11. Which of the following statements regarding a MAC address is false?

A MAC address is a 48-bit value that is commonly represented as a 12-digit hexadecimal number

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.

Explanation

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.

12. Which of the following statements regarding wireless networking is true?

Both IEEE 802.11b and IEEE 802.11g operate in the 2.4 GHz radio frequency band while Bluetooth operates at 5.0 GHz

IEEE 802.11a operates in the 2.4 GHz radio frequency band and has a maximum transmission speed of 11 Mbps

IEEE 802.11a and IEEE 802.11b are compatible because they operate at the same 2.4 GHz radio frequency band

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).

Explanation

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).

13. In the MAC address 00:04:23:d2:ee:f4, what is the device identifier?

00:04

00:04:23

88:ee:d4

00:04:23:d2:ee:f4

D2:ee:f4

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.

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.

14. What is the maximum transmission speed supported by IEEE 802.11a?

720 Kbps

2 Mbps

11 Mbps

54 Mbps

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.

Explanation

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.

15. Which of the following statements is true?

MAC addresses and private IP addresses are globally unique while public IP addresses are not

MAC addresses and IP addresses are assigned by the manufacturer of a device and cannot be changed

MAC addresses are 48-bit values while IP addresses are 32-bit values

The first half of a MAC address is the network identifier and the second half is the device identifier

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 number

Explanation

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 number

16. Which of the following does not operate in the 2.4 GHz radio frequency band?

IEEE 802.11

IEEE 802.11a

IEEE 802.11b

IEEE 802.11g

IEEE 802.11a uses the 5 GHz frequency band.

Explanation

IEEE 802.11a uses the 5 GHz frequency band.

17. IEEE 802.11b can transmit data at a rate up to _____.

2 Mbps

11 Mbps

54 Mbps

100 Mbps

IEEE 802.11b has a transmission speed of up to 11 Mbps.

Explanation

IEEE 802.11b has a transmission speed of up to 11 Mbps.

18. Your network has an IEEE 802.11b wireless network interface card (NIC). Which of the following devices would be compatible with this NIC?

Bluetooth devices

Only IEEE 802.11a devices

Only IEEE 802.11g devices

IEEE 802.11a and IEEE 802.11g devices

IEEE 802.11b and IEEE 802.11g are interoperable as they both use the 2.4 GHz frequency band.

Explanation

IEEE 802.11b and IEEE 802.11g are interoperable as they both use the 2.4 GHz frequency band.

19. Which of the following wireless networks are compatible?

IEEE 802.11a and IEEE 802.11b

IEEE 802.11a and IEEE 802.11g

IEEE 802.11b and IEEE 802.11g

IEEE 802.11a, IEEE 802.11b and IEEE 802.11g

IEEE 802.11b and IEEE 802.11g are interoperable as they both use the 2.4 GHz frequency band.

Explanation

IEEE 802.11b and IEEE 802.11g are interoperable as they both use the 2.4 GHz frequency band.

20. Which of the following is not a valid MAC address?

00:04:23:d2:ee:f4

00-04-23-92-55-64

00-04-23-d2-ee-h4

00-04-23-D2-EE-F4

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.

Explanation

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.

21. In which situation would Yagi antennas most likely be used?

To connect hosts to a Wireless Access Point

To enable roaming access for laptop users

To bridge two Wireless Access Points

Indoors

Yagi antennas focus signal in a single direction and require correct alignment. These antennas are typically used outdoors to bridge two WAPs.

Explanation

Yagi antennas focus signal in a single direction and require correct alignment. These antennas are typically used outdoors to bridge two WAPs.

22. Which of the following statements is true regarding the difference between Yagi and Omni antennas?

Yagi antennas have a longer range and a better coverage area than Omni antennas

Yagi antennas have a better coverage than Yagi antennas and are the better choice for wireless access points

Yagi antennas must be correctly aligned because they focus their signal in a single direction

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.

Explanation

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.

23. What is the maximum range of IrDA 1.1?

1 meter

11 meters

10 meters

25 meters

IrDA has a maximum range of 1 meter (3 feet).

Explanation

IrDA has a maximum range of 1 meter (3 feet).

24. Which of the following uses Orthogonal Frequency Division Multiplexing (OFDM)?

Bluetooth

IEEE 802.11a

IEEE 802.11b

IEEE 802.11g

IEEE 802.11a uses OFDM.

Explanation

IEEE 802.11a uses OFDM.

25. Which of the following would interfere with an IEEE 802.11g wireless network?

Walls

Bluetooth devices

Microwave ovens

IEEE 802.11a devices

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.

Explanation

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.

Submit

26. Which of the following would not interfere with an IEEE 802.11g wireless network?

Walls

Bluetooth devices

Microwave ovens

IEEE 802.11a devices

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.

Explanation

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.

Submit

27. In which situation would Omni antennas be best suited? (choose all that apply)

To connect hosts to Wireless Access Points

To enable roaming access for laptop users

To bridge two Wireless Access Points

To connect two buildings

Omni antennas disperse their signal in all directions and are therefore best suited to connect hosts to WAPs.

Explanation

Omni antennas disperse their signal in all directions and are therefore best suited to connect hosts to WAPs.

Submit

28. Which of the following uses the 2.4 GHz radio frequency band and Frequency Hopping Spread Spectrum (FHSS)?

Bluetooth

IEEE 802.11a

IEEE 802.11b

IEEE 802.11g

Bluetooth uses the 2.4 GHz radio frequency band and FHSS.

Explanation

Bluetooth uses the 2.4 GHz radio frequency band and FHSS.

29. Bluetooth 1.1 has a maximum transmission speed of ____ while Bluetooth 2.0 has a maximum transmission speed of _____ (select two).

720 Kbps

2 Mbps

2.1 Mbps

11 Mbps

45 Mbps

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.

Explanation

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.

Submit

30. What is the maximum transmission speed of IrDA 1.1?

720 Kbps

2 Mbps

4 Mbps

11 Mbps

IrDA 1.1 has a transmission speed of up to 4 Mbps.

Explanation

IrDA 1.1 has a transmission speed of up to 4 Mbps.