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Difference between NS2 and NS3:

Application level Difference between NS2 and NS3:

NS3 NS2
NS3 can be act as the emulator that it can connect to the real world NS2 can not be act as the emulator.
Some of the NS2 models can be imported to NS3 NS3 scripts can not run in NS2 environment

Programming Language level Difference between Ns2 and NS3:

NS3 NS2
NS3 is written using C++ NS2 is written with the help of TCL and C++.
Compilation time is not a matter C++ recompilation takes more time more than TCL so most of the scripts are written using TCL
A Simulation script can be written in ns3Simulation script is not possible with NS2
Python is available for the scripting language Only TCL can be used as the scripting language

Packets difference in NS2 and NS3:

NS3 NS2
Information needed to send through the packet can be added at the header ,trailer, buffer ,etc The header part of the NS2 includes all the information of header parts in the specified protocol
NS3 frees the memory that used to store the packets NS2 never reuse or re allocate the memory until it get terminated.
The packet of ns3 consist of single buffer and small tags .The packet of ns2 has headers and data for payload.

File Format Difference between NS2 and NS3:

NS3 NS2
.tr-> files used for trace analysis. tr-> files used for trace parameters
.XML->files are used for network Animation .nam -> files used for Network Animation
.csv-> files used for gnu plot.xg -> files used for graph

Visualization Difference between NS2 and NS3:

NS3 NS2
Python visualizer , Network Animator visualization is availableNam animator is available for visualization.

Performance level difference between ns2 and ns3:

NS3 NS2
Memory allocation is goodMemory allocation is not good as NS3
System prevents unnecessary parameters to be stored.Unnecessary parameters can not be prevented.
Total computation is less when compared to NS2Total Computation time is high when compared to NS3

We provide ns3 and ns2 projects guide students to do thier projects and shine in thier domain.We also make students clear the difference between ns2 and ns3.

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