Notifications are the lowest logging level and will provide the desired information regarding switch port up/down activity. According to the CompTIA Network+ Study Manual, notifications "are used for logging normal activities, such as port up/down events, link changes, and link flaps."

A /23 subnet mask has 23 bits set to 1 (255.255.254.0).
The formula to calculate the number of usable host addresses in a subnet is 2^(32 - subnet bits) - 2.
For a /23 subnet:
32 - 23 = 9 bits are available for host addresses.
2^9 - 2 = 510 usable host addresses.
Reference:
Professor Messer's Network+ Study Guide
CompTIA Network+ N10-008 Study Guide

Band-steering is a feature that allows an AP to steer dual-band capable clients to the less congested 5GHz frequency, leaving the 2.4GHz frequency for legacy clients. Without band-steering, the AP may have more clients competing for the same channel on the 2.4GHz frequency, resulting in high latency and airtime contention.
Reference:
According to the CompTIA Network+ Certification Exam Objectives, one of the topics covered in the exam is "Given a scenario, use appropriate wireless technologies and configurations". One of the subtopics is "Band steering" 1.
According to the PoliFi: Airtime Policy Enforcement for WiFi paper, "Band steering allows the access point to disable the 2.4 GHz band from probing the client device, so it responds only to the 5 GHz band, reducing the congestion on the 2.4 GHz band while taking advantage of the faster 5GHz band to improve user's network experience." 2.
According to the Aruba Air Slice Tech Brief, "Air Slice minimizes airtime contention and efficiently groups Wi-Fi 6 and non-Wi-Fi 6 client devices to guarantee bit rate, and provide bounded latency and jitter simultaneously." 3.

NetFlow is a protocol that collects and analyzes network traffic data. It provides information about the source and destination of traffic, the volume of data, and other relevant details.
By enabling NetFlow on the WAN interface, the cybersecurity department can monitor historical traffic patterns without additional hardware or sensors.
Reference:
Professor Messer's Network+ Study Guide

A reservation should be configured to ensure a device with a specific MAC address is always assigned the same IP address from DHCP. A reservation is a feature of DHCP that allows an administrator to assign a fixed IP address to a device based on its MAC address. This way, the device will always receive the same IP address from the DHCP server, even if it is powered off or disconnected from the network for a long time. Reference: https://docs.microsoft.com/en-us/windows-server/troubleshoot/configure-dhcp-reservations