A method of synchronizing a block diagram view of a system being modeled with a three-dimensional view of the system being modeled and with the underlying block diagram model data is disclosed. The cross section geometry, the wall thickness, and the fiber orientation vary in axial direction and radial direction such that the requirements defined by the available construction space and the expected loads are fulfilled. If the processor requests that address a second time, then there is a significant probability that the address will be accessed again. The sender host perceives the acknowledgement packet as having been sent by the destination host.