Yes, it can be determined if an an external web site was likely accessed from a computer in the same department a couple of seconds ago.
Explanation:
Yes. “Dig” can be used to search that website in the local DNS server. A practical example would be to insert “dig google.com” and that will give us the result of the query time for searching and finding google.com. Supposing google.com was accessed a few seconds ago, then an entry for google.com is cached in the local DNS cache and the search or query time is 0 msec. If not the query time will be large.
