Explanation
Based on the site survey table, we can see that AP 2, AP 3, and AP 4 are all broadcasting on the same channel, which can cause interference and affect performance. Therefore, the next step a wireless technician should take to troubleshoot this issue is to reconfigure the channels to reduce overlap. This will help to improve network performance and eliminate any interference.
References:
Network+ N10-007 Certification Exam Objectives, Objective 2.8: Given a scenario, troubleshoot common wireless problems and perform site surveys.

A warm site is a backup data center that has some network equipment and connectivity, but not enough to handle the full load of the primary site. It requires some time and effort to activate and configure in the event of a disaster12.
An active-active site is a backup data center that is fully operational and synchronized with the primary site, and can take over the load immediately if the primary site fails. It is the most expensive and complex option12.
A cold site is a backup data center that has no network equipment or connectivity, and only provides physical space and power. It requires a lot of time and resources to set up and activate in the event of a disaster. It is the cheapest and simplest option12.
A cloud site is a backup data center that is hosted by a third-party provider, and can offer various levels of availability and scalability depending on the service level agreement. It can be a cost-effective and flexible option, but also introduces some challenges such as security, compliance, and vendor lock-in13.
Reference:
1: CompTIA Network+ N10-008 Study Guide, Chapter 6: Network Resiliency and Availability, Section: Disaster Recovery
2: Professor Messer's CompTIA N10-008 Network+ Course Notes, Page 54: Disaster Recovery Sites
3: Backup Strategy: Ultimate Guide for Data Backup

VLAN hopping is a type of attack that allows an attacker to access or manipulate traffic on a different VLAN than the one they are connected to. One way to prevent VLAN hopping is to change the default VLAN on a switch. The default VLAN is the VLAN that is assigned to all ports on a switch by default, usually VLAN 1. If an attacker connects to an unused port on a switch that has not been configured with a specific VLAN, they can access or spoof traffic on the default VLAN. By changing the default VLAN to an unused or isolated VLAN, the network administrator can prevent unauthorized access or interference with legitimate traffic on other VLANs. References: https://www.comptia.org/training/books/network-n10-008-study-guide (page 308)