Explanation
Implementing directional antennas on AP1 and AP2 is the best step for the technician to take to resolve the issue of undesired RSSI in the parking lot and other exterior areas near the building. RSSI stands for received signal strength indicator, which is a measure of how well a device can receive a wireless signal from an access point (AP). An AP is a device that provides wireless connectivity to a network. An antenna is a device that radiates or receives electromagnetic waves. A directional antenna is an antenna that focuses the wireless signal in a specific direction, resulting in higher gain and longer range. By using directional antennas on AP1 and AP2, which are located near the exterior walls of the building, the technician can reduce the wireless signal leakage to the outside areas and improve the wireless coverage inside the building. References: [CompTIA Network+ Certification Exam Objectives], What Is RSSI and How Does It Affect Wireless Networks?, Directional Antennas: Everything You Need to Know

QSFP+ is a transceiver type that can support up to 40Gbps. It stands for Quad Small Form-factor Pluggable Plus and uses four lanes of data to achieve high-speed transmission. It is commonly used for data center and high-performance computing applications. Reference: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-660083.html

* The concept of Zero Trust is based on the principle of never trust, always verify. It means that every request for accessing network resources, regardless of where it originates from, must be authenticated and authorized before granting access12.
* Zero Trust is different from SSO (single sign-on), which allows users to log in once and access multiple applications without re-authenticating3. SSO simplifies the user experience, but does not provide the same level of security as Zero Trust.
* Zero Trust is also different from VPN (virtual private network), which creates a secure tunnel between a remote device and a network, encrypting the traffic and hiding the device's IP address4. VPN provides privacy and protection from external threats, but does not verify the identity and permissions of the device or user accessing the network.
* Zero Trust is also different from role-based access control (RBAC), which assigns permissions to users or groups based on their roles and responsibilities5. RBAC helps to enforce the principle of least privilege, but does not verify the context and conditions of each access request.
* Therefore, the best answer is B. Zero Trust, which requires authentication and authorization for each application access, regardless of the source or location of the request.
References:
* 1: What is Zero Trust? A model for more effective security | CSO Online
* 2: CompTIA Network+ N10-008 Certification Study Guide, page 472
* 3: [What is Single Sign-On (SSO)? - Definition from WhatIs.com]
* 4: [What is a VPN? | Virtual Private Networks Explained | Norton]
* 5: [What is Role-Based Access Control (RBAC)? - Definition from Techopedia]

A site-to-site VPN is a type of VPN that connects two or more remote offices securely over an untrustworthy network, such as the Internet. A site-to-site VPN allows each office to access network shares and resources at the other site, as if they were on the same local network. A site-to-site VPN encrypts and tunnels the traffic between the offices, ensuring privacy and integrity of the data. Reference: https://www.comptia.org/blog/what-is-a-site-to-site-vpn

Channel bonding is a technique that allows two or more adjacent channels to be combined into a wider channel, increasing the data rate and throughput of the wireless network. Channel bonding can improve the performance of the Wi-Fi network by utilizing more of the available spectrum and reducing interference from other devices. Channel bonding is supported by Wi-Fi 5 (802.11ac) and Wi-Fi 6 (802.11ax) standards.
References: CompTIA Network+ N10-008 Cert Guide, Chapter 4, Section 4.2