Original Post
So I am using a mail metaphor to explain the TCP/IP Model (5 layers) and the encapsulation to a bunch of management types. At each layer I explain the purpose of the layer, and relate it to mail delivery Application <--> Letter Transport <--> Envelope Internet <--> Bundle Data Link <--> Mail Bag Physical <--> Mail Truck The metaphor works, but now I need to explain why the technical security controls in place are not effective to stop application layer threats. Would using the Anthrax Letters be too tacky a metaphor? Personally I think it is as funny as hell, and communicates the danger fairly effectively, after all, there is no real way to detect the exploit without opening the TCP/IP packet payload, nor was there a way to detect anthrax in the existing postal system when that incident occurred. Too tacky? Too fresh in peoples minds?