Security in Computing 5th Edition by Shari Lawrence Pfleeger, Charles P Pfleeger, Jonathan Margulies

Exercise 42

Recall that packet reordering and reassembly occur at the transport level of the TCP/IP protocol suite. A firewall will operate at a lower layer, either the Internet or data layer. How can a stateful inspection firewall determine anything about a traffic stream when the stream may be out of order or damaged?