Interface or not?

I am designing a program that uses "nodes", to represent a node in a network. They have certain simple properties, like an id and a name. However, I am unsure whether or not I should have an interface for the most basic node, or whether it should just be a class that other different types of node subclass from.
If I have a "Node", the most simple type of node available and then different types of node (SimpleNode, GraphicalNode) that subclass it, are these different subclasses interchangable?
Should "Node" be an interface, with the others implementing it? I don't see that an interface would help at all, as "Node" really needs some code (for setting the id, etc). Do I even need to bother with an interface at all?

I'm also working on a project involving "nodes": I made an abstract superclass Node.

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