MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

15-26 Chapter 15 Configuring Network and Internet Connections
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modifies Windows Firewall so that your computer can send and receive VPN traffic.
Select the option either to allow or not allow VPN connections, and then click Next.
Figure 15-15 Configure the device that the incoming connection will use.
Specifying User Permissions and Callback Options
You must specify which users can use this inbound connection in the User Permissions
page. After you select a user, click Properties. In the user-name Properties dialog box,
click the Callback tab to set the callback options. You can choose Do Not Allow Callback,
Allow The Caller To Set The Callback Number, or Always Use The Following
Callback Number. Enabling callback causes the remote server, in this case your computer,
to disconnect from the client calling in, and then to call the client computer
back. By using callback, you can have the bill for the phone call charged to the office
phone number rather than to the phone number of the user who called in. Callback
can also be used to increase security because if you specify the callback number you
do not have to worry about someone trying to break in. Even if an unauthorized user
calls in, the system calls back at the number you specified, not the number of the unauthorized
user.
Selecting Networking Software
After you specify the callback options, click Next. The New Connection Wizard displays
the Networking Software page. You can choose the networking software you
want to enable for incoming connections. You can also install additional networking
software by clicking Install. Click Finish to create the connection.