It is any routing protocol used within an autonomous system.

System is a predefined final class, out is a PrintStream object and println is a built-in overloaded method in the out object.

System.Globalization and System.Resources.

The tracing dumps can be quite verbose.  For applications that are constantly running you run the risk of overloading the machine and the hard drive.  Five levels range from None to Verbose, allowing you to fine-tune the tracing activities.

A catch block that catches the exception of type System.Exception.  You can also omit the parameter data type in this case and just write catch {}.

The Clone() method returns a new array (a shallow copy) object containing all the elements in the original array.  The CopyTo() method copies the elements into another existing array.  Both perform a shallow copy.  A shallow copy means the contents (each array element) contains references to the same object as the elements in the original array.  A deep copy (which neither of these methods performs) would create a new instance of each element's object, resulting in a different, yet identacle object.