Explanation
Site-to-site VPN is a type of VPN solution that connects two or more networks or sites across the public internet in a secure and encrypted way. Site-to-site VPN can be implemented using VPN appliances, such as firewalls or routers, that can establish and maintain the VPN tunnel between the sites. Site-to-site VPN can support multiple users or devices that need to access resources on the other site without requiring individual VPN clients or software. Site-to-site VPN is the best solution to support the new remote office, as it can provide secure and seamless connectivity between the office network and the main network of the organization. Verified References:
* Virtual Private Networks - SY0-601 CompTIA Security+ : 3.3
https://www.professormesser.com/security-plus/sy0-601/sy0-601-video/virtual-private-networks-sy0-601- (See Site-to-Site VPN)
* VPN Technologies - CompTIA Security+ SY0-501 - 3.2
https://www.professormesser.com/security-plus/sy0-501/vpn-technologies/ (See Site-to-Site VPN)
* Security+ (Plus) Certification | CompTIA IT Certifications
https://www.comptia.org/certifications/security (See Domain 3: Architecture and Design, Objective 3.3:
Given a scenario, implement secure network architecture concepts.)

PEAP stands for Protected Extensible Authentication Protocol, which is a protocol that can provide secure authentication for wireless networks. PEAP can use certificates to authenticate the server and the client, or only the server. PEAP can also use other methods, such as passwords or tokens, to authenticate the client.
PEAP can ensure only employees with a valid certificate can authenticate to the network.

Explanation
Trusted Automated Exchange of Intelligence Information (TAXII) is a standard protocol that enables the sharing of cyber threat intelligence between organizations. It allows organizations to automate the exchange of information in a secure and timely manner. References: CompTIA Security+ Certification Exam Objectives -
3.6 Given a scenario, implement secure network architecture concepts. Study Guide: Chapter 4, page 167.

Explanation
The Service Level Agreement (SLA) is a contract between the cloud service provider and the organization that stipulates the exact requirements for the cloud provider. It outlines the level of service that the provider must deliver, including the minimum uptime percentage, support response times, and the remedies and penalties for failing to meet the agreed-upon service levels.