When the same default tracking code is installed on pages with different domains, what will result?

For cross-domain tracking, set up one property in your Analytics account. Use the same tracking code snippet and tracking ID from that property for all of your domains. To set up cross-domain tracking for multiple top-level domains, you need to modify the Analytics tracking code on each domain. In this case, Analytics will be able to associate data with their respective domains. Tip: By default, Analytics only includes the page path and page name, not the domains name.