A user cannot reach the internet from a workstation. A systems administrator performs diagnostics with the following results: Which of the following is the cause for lack of internet connectivity?

DNS is required to resolve hostnames, but even without DNS a workstation can reach the internet by IP address - a DNS issue would not fully block internet connectivity.

If the gateway were unreachable, that would itself be a symptom of the misconfigured subnet mask, not an independent root cause.

If the subnet mask on interface enp2s0 is misconfigured, the workstation will incorrectly calculate its network range, potentially placing the default gateway outside the perceived local subnet. This means the workstation cannot send packets to the gateway, which is required for all internet-bound traffic. Fixing the subnet mask restores correct routing logic.

A firewall blocking connections is possible but is a less likely default cause compared to a local interface misconfiguration, and diagnostics would typically show the gateway as reachable in that scenario.