You probably have visitors (business partners or associates) come to your offices and sometimes they would like to have Internet access from your facilities. It's a reasonable request but that could present security risks since you don't know the state of their computer plus you might expose your internal network, which as you know can lead to all sorts of mischief.
Is this a situation you find yourselves having to address in your business and if so then how to you handle it? Do you provide some type of isolated connectivity that keeps your network safe while still allowing your guests to access the Internet? Or maybe just deny the request politely?