CompTIA Network+ Question B-51

Which of the following is a security benefit gained from setting up a guest wireless network?

A. Optimized device bandwidth
B. Isolated corporate resources
C. Smaller ACL changes
D. Reduced password resets

Correct Answer: B

Explanation:
A wireless guest network could be set up so that it has limited access (no access to local resources) but does provide Internet access for guest users. The corporate resources would be inaccessible (isolated) from the guest network.

CompTIA Network+ Question B-30

A user connects to a wireless network at the office and is able to access unfamiliar SMB shares and printers. Which of the following has happened to the user?

A. The user is connected using the wrong channel.
B. The user is connected to the wrong SSID.
C. The user is experiencing an EMI issue.
D. The user is connected to the wrong RADIUS server.

Correct Answer: B

Explanation:
The user is connecting to an SSID assigned to a different subnet. Therefore, the user has access to SMB shares and printers that are not recognizable.

CompTIA Network+ Question B-25

A network administrator is tasked with building a wireless network in a new adjacent building. Wireless clients should not have visibility to one another but should have visibility to the wired users. Users must seamlessly migrate between the two buildings while maintaining a connection to the LAN. Which of the following is the BEST way to configure the new wireless network in the new building?

A. Use the same SSIDs on different channels and AP isolation
B. Use different SSIDs on different channels and VLANs
C. Use different SSIDs on the same channels with VLANs
D. Use the same SSIDs on same channels with AP isolation

Correct Answer: A

CompTIA Network+ Question B-11

A network administrator wants to deploy a wireless network in a location that has too much RF interference at 2.4 GHz. Which of the following standards requires the use of 5 GHz band wireless transmissions? (Select TWO)

A. 802.11a
B. 802.11ac
C. 802.11b
D. 802.11g
E. 802.11n

Correct Answer: AB

CompTIA Network+ Question A-99

A network technician has been tasked with designing a WLAN for a small office. One of the requirements of this design is that it is capable of supporting HD video streaming to multiple devices. Which of the following would be the appropriate wireless technology for this design?

A. 802.11g
B. 802.11ac
C. 802.11b
D. 802.11a

Correct Answer: B

Explanation:
In this question, we need a wireless network capable of supporting HD video streaming to multiple devices. We therefore need the fastest wireless network speed available.
802.11 is a set of IEEE standards that govern wireless networking transmission methods. The 802.11 standards commonly used today to provide wireless connectivity in home or office wireless networks are 802.11a, 802.11b, 802.11g, 802.11n and 802.11ac.
The 802.11ac standard is the fastest wireless network supporting speeds of over 3Gbps and uses the 5-GHz band.

CompTIA Network+ Question A-76

A company is experiencing very slow network speeds of 54Mbps. A technician has been hired to perform an assessment on the existing wireless network. The technician has recommended an 802.11n network infrastructure. Which of the following allows 802.11n to reach higher speeds?

A. MU-MIMO
B. LWAPP
C. PoE
D. MIMO

Correct Answer: D

Explanation:
One way 802.11n achieves superior throughput is through the use of a technology called multiple input, multiple output (MIMO). MIMO uses multiple antennas for transmission and reception.

CompTIA Network+ Question A-59

The management team wants to set up a wireless network in their office but all of their phones operate at the 2.4 GHz frequency. They need a wireless network that would be able to operate at a higher frequency than their phones. Which of following standards should be used?

A. 802.11a
B. 802.11b
C. 802.11g
D. 802.1x

Correct Answer: A

Explanation:
In this question, we need a wireless network that operates at a frequency higher than the 2.4GHz frequency.
802.11 is a set of IEEE standards that govern wireless networking transmission methods. The 802.11 standards commonly used today to provide wireless connectivity in home or office wireless networks are 802.11a, 802.11b, 802.11g, 802.11n and 802.11ac.
The 802.11a standard supports speeds up to 54Mbps and uses the 5-GHz band.

CompTIA Network+ Question A-50

A company is deploying a new wireless network and requires 800Mbps network throughput. Which of the following is the MINIMUM configuration that would meet this need?

A. 802.11ac with 2 spatial streams and an 80MHz bandwidth
B. 802.11ac with 3 spatial streams and a 20MHz bandwidth
C. 802.11ac with 3 spatial streams and a 40MHz bandwidth
D. 802.11ac with 4 spatial streams and a 160MHz bandwidth

Correct Answer: A

Explanation:
Spatial streaming is used in wireless communications where multiple-input-multiple-output (MIMO) is being used. With MIMO, multiple antennas are used for transmission and reception. MIMO was available in 802.11n but its capabilities have been extended in 802.11ac.
802.11ac supports a mandatory 80 MHz channel bandwidth for stations (vs. 40 MHz maximum in 802.11n), 160 MHz available optionally and more (up to 8) special streams.
A single antenna and 80 MHz channel bandwidth provides a bandwidth of 433Mbps. In this question, we need a minimum bandwidth of 800Mbps. Two antennas and 80 MHz channel bandwidth provides a bandwidth of 867Mbps and therefore meets the requirement.

CompTIA Network+ Question A-47

A user with an 802.11n WLAN card is connected to a SOHO network and is only able to connect at 11 Mbps with full signal strength. Which of the following standards is implemented on the network?

A. 802.11a
B. 802.11ac
C. 802.11b
D. 802.11g

Correct Answer: C

Explanation:
802.11 is a set of IEEE standards that govern wireless networking transmission methods. The 802.11 standards commonly used today to provide wireless connectivity in home or office wireless networks are 802.11a, 802.11b, 802.11g, 802.11n and 802.11ac.
802.11b supports speeds up to 11Mbps and uses the 2.4GHz frequency.
In this question, the user is using an 802.11n WLAN card. Although the 802.11n WLAN card can support speeds up to 300Mbps, the user is only able to connect at 11Mbps because the user is connected to a wireless network configured to use 802.11b.

CompTIA Network+ Question A-29

A network engineer is dispatched to an employee office to troubleshoot an issue with the employee’s laptop. The employee is unable to connect to local and remote resources. The network engineer flips the laptop’s wireless switch on to resolve the issue. At which of the following layers of the OSI model was the issue resolved?

A. Layer 1
B. Layer 2
C. Layer 3
D. Layer 4
E. Layer 7

Correct Answer: A

Explanation:
The bottom layer of the OSI reference model is Layer 1, the physical layer.
The physical layer is the layer that defines the hardware elements of a network. These elements include:
Network Interface Cards
Network topology Network cabling
The type of signals used for data transmittions
In this question, the network engineer flipped the laptop’s wireless switch on to resolve the issue. The laptop was unable to connect to the wireless network because the wireless network interface card was switched off. Switching the wireless network interface card on enabled the laptop to connect to the wireless network. The wireless network interface card is a physical layer device.