VPN

Correct Answer: Remote Access VPN

The best option in this scenario is a 'Remote Access VPN'. This type of VPN is best suited for individuals or remote employees who need to access their company's internal resources securely from a different location. It establishes a secure connection between the user's device and the company's network allowing remote employees to access internal resources as if they were physically present at the office. The other VPN types mentioned do not serve the same purpose. A 'Site-to-Site VPN' is used to connect entire networks to each other, typically used when different offices of the same company need to securely connect their local area networks (LANs). An 'Intranet VPN' is used to connect LANs in a way that mimics an intranet setting and an 'Extranet VPN' connects LANs from different organizations, allowing them to collaborate in a shared environment.

Correct Answer: IPsec ESP

The correct answer is IPsec ESP. IPsec stands for Internet Protocol Security and it's used to secure communications at the network layer by providing encryption, authentication and integrity. There are two methods in IPsec, ESP (Encapsulating Security Payload) and AH (Authentication Header). ESP provides encryption for the data at the network layer which was the requirement in the question, while AH only provides authentication and integrity, but not encryption. As for the other two options, SSL/TLS is used for secure communication at the transport layer and not the network layer, and SSH is a network protocol for secure transfer of data, but it also operates at a higher layer than required here, thus they are not appropriate for the network layer encryption required in this scenario.

Correct Answer: Site-to-Site VPN with strong encryption

A Site-to-Site VPN with strong encryption is the best solution in this case. This is because this type of VPN creates a secure and encrypted connection between two sites over the internet, preventing eavesdropping and man-in-the-middle attacks. Site-to-Site VPN with weak encryption, while it can connect two remote sites, does not provide sufficient security to prevent potential eavesdropping or man-in-the-middle attacks. Remote Access VPN might be suitable for individuals or small teams working remotely, but it might be less efficient for connecting entire remote offices. Lastly, direct office-to-office connections with VLANs, while it can connect two offices, it does not inherently offer the same level of security against eavesdropping or man-in-the-middle attacks as a properly configured VPN with strong encryption.