Introduction to Network Emulation by Razvan Beuran

By Razvan Beuran

Emulation is a hybrid experimentation method meant to bridge the space among simulation and real-world checking out. the main inspiration of emulation is to breed in actual time and in a managed demeanour the basic performance of a procedure, in order that it could actually have interaction with different genuine structures that could therefore be evaluated. This ebook describes the means of community emulation and compares it with the opposite experimental techniques: the scholarly analytical modeling, the preferred community simulation, and the hard real-world trying out. to stress the sensible elements with regards to emulation, this publication provides plenty of examples of community emulators out there, in addition to offers an in-depth research of a case learn, the instant community emulation testbed referred to as QOMB.

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An alternative is to use a higher-level script language, which is interpreted and then executed on a PC. ). These computer models are then run in logical time on one or more (in the case of distributed execution) PCs. The results and observations of the experiment are then associated with the network system that was modeled. 2 Possible points of failure One significant difference between reality and simulation is the use of logical time, which was discussed above. This makes simulated September 6, 2012 13:6 PSP Book - 9in x 6in 32 Network Emulation 101 systems very predictable, but at the same time the simulation experiment results may not be very accurate when compared to reality.

1 we summarize the above considerations so as to provide an easy-to-read qualitative view of the differences between network emulation and the other experiment techniques. We would like to conclude this section with a remark intended to make users judge by themselves what is the best choice of an experiment technique for a particular situation. Although we believe that emulation does indeed borrow the best aspects of simulation and real-world testing, by no means do we suggest that the other experiment techniques can be disregarded.

System capacity and calling population are also usually assumed to be infinite. The service discipline is typically first-in, first-out (FIFO). 13 September 6, 2012 13:6 PSP Book - 9in x 6in 14 Network Emulation 101 Another type of model that is used in computer science and that may be built on the basis of analytical models is defined below. 4. A computer model is a computer representation of a system in which the physical components of the system are represented by virtual components. Note that a computer model may contain analytical models to describe system functioning, but this is not necessary.

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