When a corporate laptop is connected to the company network, it can reach external websites.

Comprehensive and Detailed Explanation From Exact Extract:

If internal resources (such as intranet or internal apps) can't be accessed but external sites work, this often points to aDNS issue, where the system isn't resolving internal domain names correctly.

FromAll-in-One Exam Guide:

“When internet access is functional but internal sites fail to load, the issue usually lies with DNS resolution. Internal resources often require internal DNS servers, which may not be configured correctly.”