Can we use .snk file for a c++ dll?

Question

It would be great if someone could help me on this.I have recently started exploring strong named assembly.I wanted to understand the following:

• .snk file and what does it contains?
• can we use this .snk file for a c++ dll?
• Is this only limited to .net assemblies?
• can we use this .snk to load or unload dlls?
• How secure is this?