You manage a network of multiple subnets connected to the Internet. A user reports that she can't access the Internet. You investigate the problem and find that she can access all hosts on the private network, but no hosts on the Internet. Which of the following is likely the cause of the problem?

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).