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 A+ Question G-81

Recently a company updated their network infrastructure. A user reports that a laptop is experiencing slower network speeds since the update. Which of the following would the technician replace, rather than purchase a new device?

A. Wireless NIC
B. CPU
C. RAM
D. Hard drive

Correct Answer: A