DHCP is a protocol that dynamically assigns IP addresses to devices on a network. DHCP allows devices to obtain an IP address automatically without manual configuration. DHCP also simplifies network management by reducing IP conflicts and address exhaustion.
A DHCP setting is a configuration option that affects how DHCP operates on a network. DHCP settings can be applied at different levels, such as the server, the scope, or the client. DHCP settings can control various aspects of the IP address assignment process, such as the range, the duration, the options, and the exclusions.
A DHCP reservation is a DHCP setting that assigns a specific IP address to a specific device based on its MAC address. A DHCP reservation ensures that the device always receives the same IP address from the DHCP server, even if the lease expires or the device reboots. A DHCP reservation can be useful for devices that need a consistent IP address, such as servers, printers, cameras, or gaming consoles.
The other options are not DHCP settings that would ensure a device gets the same IP address each time it is connected to the network. Scope options are DHCP settings that apply to a group of devices within a defined range of IP addresses. Exclusion is a DHCP setting that prevents a range of IP addresses from being assigned to any device. Relay is a DHCP setting that allows a device to forward DHCP requests from one network segment to another. Pool is a DHCP setting that defines the available IP addresses that can be assigned to devices. Reference:
CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Operations, Section 3.3: Network Configuration Management, Subsection: DHCP, pp. 144-146.
Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.6: Network Addressing, Subsection: DHCP, p. 38.
Static IP vs DHCP Reservation, The Tech Journal, May 7, 2019.

The type of data center architecture that will most likely be used in a large SDN and can be extended beyond the data center is spine and leaf. Spine and leaf is a network topology that consists of two layers of switches: spine switches and leaf switches. Spine switches are interconnected to each other and form the core of the network, while leaf switches are connected to each spine switch and form the access layer of the network. Spine and leaf topology provides high scalability, performance, and flexibility for data center networks, especially for SDN (Software Defined Networking) environments that require dynamic traffic flows and virtualization. Reference: CompTIA Network+ N10-008 Certification Study Guide, page 16; The Official CompTIA Network+ Student Guide (Exam N10-008), page 1-9.

Interference from other devices can cause wireless connection drops or slow performance. This can happen when devices use the same or overlapping frequency channels as the wireless network, such as cordless phones, microwaves, Bluetooth devices, etc. To avoid interference, it is recommended to use non-overlapping channels and avoid placing wireless access points near potential sources of interference. References:
Network+ Study Guide Objective 2.1: Explain the purposes and use cases for advanced network devices.
Subobjective: Wireless controllers.