Ann, a customer, has a wired router that connects to the Internet without any issue, but does not provide any other network services. When users connect PCs to the router, they cannot access the…

The default gateway on the router is already working correctly since the router itself connects to the Internet; changing it would not fix client DNS resolution.

When a router itself has Internet connectivity but connected PCs cannot resolve or reach external resources, the most common cause is that the PCs lack a valid DNS server address. Setting the DNS to a public resolver such as 8.8.8.8 on the PCs allows hostname resolution and restores Internet access.

There is no indication in the scenario that MAC filtering is enabled on the router, and MAC filtering would typically prevent all access rather than selectively blocking Internet traffic.

Half-duplex vs. full-duplex mismatch causes performance degradation and collisions but would not completely prevent Internet access in the described way.