Chapter 2. Managing SQL Server Services and Clients
For controlling access to your server, few things are more important than how you configure the services, components, and networking capabilities in Microsoft SQL Server. Every SQL Server installation has a specific configuration for the services it uses, its components, and the network, and the configuration determines security levels that control access in the surface area of the server, such as:
Who can access the server and by what means
Where and by what means SQL Server components can connect to (or be connected from) ...