what does "do you want subdomains to navigate across different domains" mean?

Answer 1

Example might be DNS (Domain Name System) that is hyerarchical tree structure. On the top is the root, and the next layer are its subdomains: .int, .com, .edu, etc. On the third layer of .edu (for instance) are its subdimains like: .yale, .mit, .uta, etc. Your phrase is probably wrong in a sense that your browser navigates through different domains and subdomains. You cannot have subdomains to navigate, but you navigate through subdomains. For instance, if someone from .com want to send an e-mail to [e-mail], it will go up the tree to the .com domain, then to the root, then down to the .edu subdomain, then to the .yale, and finally to the .cs subdomain where he will find the IP address of the xy. I am intentionally mixing notion of domain and subdomain since it depends where you are. However, subdomain is always layer(s) down from the domain. Like .yale is the subdomain of .edu, etc.