You must configure a laptop for a company salesman's trip. The salesperson requires access to corporate files to edit a presentation being delivered by another salesperson in another city next week. The laptop will have intermittent Internet access through wired hotel networks, airport wireless centers, and wireless WAN broadband. The gap between available connections will not be longer than 6 hours. You decide to implement a VPN. What type of VPN should you select so the salesperson can tolerate network connection losses without losing their work?