You want to allow traveling users to connect to your private network through the internet. Users will connect from various locations including airports, hotels, and public access points such as coffee shops and libraries. As such, you won't be able to configure the firewalls that might be controlling access to the Internet in these locations. Which of the following protocols would be most likely to be allowed through the widest number of firewalls?

The TestOut Network Pro certification measures your ability to perform tasks commonly performed by IT network professionals, including systems administrators, network administrators, network engineers and related careers. This certification covers the topics in CompTIA Network+ (N10-007) certification. The Testout Network pro certification syllabus covers multiple operating systems, including: Windows Client, Windows Server, macOS, Enterprise Wireless configuration, and Cisco Command-Line interface (routers and switches).