2.4 Given a scenario, install and configure the appropriate wireless standards and technologies.

Question 1

A new office room on the second floor needs wireless networking installed to support video conferencing equipment. The IT manager has set aside a small budget, but the network engineer needs to support at least two 2,167 Mbps streams over 80 MHz 5 GHz band channels. While staying within budget, what minimum 802.11 wireless standard access point (AP) can the engineer purchase to complete the work?

Wi-Fi 5

Wi-Fi 4

Wi-Fi 6

Wireless g

Answer 1

Wi-Fi 5 (802.11ac) is designed to provide network throughput similar to Gigabit Ethernet. An AC5300 can support 1000 Mbps over a 40 MHz 2.4 GHz band channel and two 2,167 Mbps streams over 80 MHz 5 GHz band channels.

Wi-Fi 4 (802.11n) is rated at providing 72 Mbps per stream. Assuming the maximum number of four spatial streams and optimum conditions, the nominal data rate could be as high as 600 Mbps for a 40 MHz bonded channel.

Wi-Fi 6 (802.11ax) is designed to approximate 10G connections such as the AX11000. This is achievable using a 6 Ghz frequency band.

Wireless g or 802.11g uses the 2.4 GHz frequency band and has a nominal data rate of 54 Mbps.

Question 2

Users at a company use a mix of wireless devices (phones, tablets, laptops) that use either the 2.4 or 5 GHz spectrum. Considering the given wireless 802.11 standard, which one does the company utilize for their mobile devices?

You Were Unsure and incorrect

a

b

n

g

Answer 2

802. 11n products can use channels in the 2.4 GHz band or the 5 GHz band, although the 5 GHz band is preferred for optimal bandwidth and to avoid interference.
803. 11b standardized the use of the carrier method Direct Sequence Spread Spectrum (DSSS), uses the 2.4 GHz band, and operates at 11 Mbps.

The 802.11a has a nominal data rate of 54 Mbps and is an older wireless specification that was released in 1999. It uses only the 5 GHz band.

802.11g uses the 2.4 GHz band and has a nominal data rate of 54 Mbps. When in 802.11b compatibility mode, it drops back to using DSSS.

Question 3

A manager wants to upgrade the wireless g network that provides Internet access to other mobile devices. If the manager wants to spend the least amount of money but increase wireless network speeds to the next level, which wireless technology should the next wireless router support?

5G network

Wi-Fi 4

Wireless ac

Wi-Fi 6

Answer 3

Wi-Fi 4 (802.11n) provides 72 Mbps per stream rates. This is the next available version of the 802.11 standards after wireless g that can increase that manager’s network bandwidth without being too expensive.

Wi-Fi 5 (802.11ac) provides network throughput similar to Gigabit Ethernet. An AC5300 can support 1000 Mbps over a 40 MHz 2.4 GHz band channel and two 2,167 Mbps streams over 80 MHz 5 GHz band channels.

Wi-Fi 6 (802.11ax) approximates 10G connections such as the AX11000. This is achievable using a 6 Ghz frequency band.

The 5G network is a cellular technology that produces real-world speeds between 50 Mbps to 300 Mbps.

Question 4

Which of the following options does a wireless g access point NOT support? (Select all that apply.)

Multiple-Input-Multiple-Output (MIMO)

5.0 GHz frequency

Channel bonding

2.4 GHz frequency

Answer 4

Wireless g (802.11g) does not use the 5.0 GHz frequency range. Wireless n does support both the 2.4 GHz and 5.0 GHz frequencies.

Wireless n (802.11n) does support channel bonding. For example, wireless n allows combining two adjacent 20 MHz channels into a single 40 MHz channel.

Wireless n supports Multiple-Input-Multiple-Output (MIMO), which increases bandwidth by multiplexing the signals from 2 to 4 separate antennas (a radio chain).

Wireless g only supports the 2.4 GHz range. Wireless g uses Orthogonal Frequency Division Multiplexing (OFDM), which makes it possible also to support backward compatibility for legacy 802.11b clients.