When testing your internet speed, you may have noticed that the numbers reported can vary quite a bit. Internet Service Providers quote a speed, but if you read carefully you'll notice the phrase "up to", which tells you that's just the maximum possible speed they can give. There are many factors that can contribute to the speeds you actually will get.
Patrick wants to know how secure a guest network would be? Leo says that while it's convenient for when he has guests, if their computer is compromised, so is his network. Some networks can create an isolated connection via VLAN, where all the guests would get is an internet connection.
Dan wants to be able to transmit his movies over his network, but he can't see the drive he has hooked up to the router. Leo says that it sounds like the drive is set to Read-only through the Asus router Dan uses. It also depends on his file sharing settings in Windows. ScooterX says that Windows uses SMB, which is the most common file sharing standard. Heres a tech note on how (asus.com). But it will likely be very slow.
Gina tried to change her Windows account to a limited user, but now she has no internet connection. What happened? Leo says that sometimes a program won't operate properly unless it runs as an administrator. So that may cause the issue connecting to the Internet. She also has DSLExtreme and it may be that downgrading may have broken her connection to them. Leo says she should double check her connections as well. But at this point, Leo advises contacting DSLExtreme to ask them for help.
It's testing the entire chain, the computer and the network. Shields Up will ping Manny's computer on every port to find out if any of those ports are open. It's a conversation between Steve Gibson's website at GRC.com and Manny's computer. If his computer responds to any conversations that it tries to have, then Shields Up will tell him that those ports are open and he's insecure.