Explanation
The 2. band is subdivided into up to 14 channels, spaced at 5 MHz intervals from 2412 MHz up to 2484 MHz.
Wi-Fi requires bandwidth of approximately 20 MHz, not 5 MHz. Consequently, a site designer needs to choose the channels that do not overlap. On a WLAN where only the first 11 channels are available, channels
1, 6, and 11 can be selected as non-overlapping. Note: In the Americas, regulations permit the use of channels
1-11 only, while in Europe, channels 1-13 are permitted. In Japan, all 14 channels are permitted.

Explanation
802.11 ax is a wireless networking protocol that supports both 2.4GHz and 5GHz devices, as well as backward compatibility with previous 802.11 standards. 802.11 ax offers higher data rates, lower latency, increased capacity, and improved power efficiency than previous protocols. It is also known as Wi-Fi 6 or High Efficiency Wireless (HEW). Reference:
https://www.comptia.org/training/books/a-core-1-220-1101-study-guide (page 82)

Explanation
Rapid elasticity would be used by an online retailer to quickly add more web servers during peak sales times.
References: CompTIA A+ Certification Exam Guide, Exam 220-1001, Page 405

Explanation
A load balancer is a network device that distributes network or application traffic across multiple servers to ensure that no single server bears too much of the load. Load balancing helps to improve application availability, increase scalability, and optimize resource utilization.
A bridge is used to connect two different networks, often to divide a larger network into smaller segments. A proxy server is used to forward client requests to other servers, and can also be used to cache frequently requested data. A switch is used to connect multiple devices within a network and to control the flow of network traffic. A firewall is used to secure a network by controlling incoming and outgoing traffic based on defined security rules.
Reference: CompTIA A+ Core 1 Exam Guide, page 244.