(Cisco GNS3v2.0.0alpha2all-in-one network simulator official update released on October 22, 2016! Integrate the latest version of the major components so far! Although this version is an alpha version, many bugs in the previous version have been modified and many new functions have been added. There is no problem in doing Cisco's conventional routing and switching experiments, and it can be used as the official version! Open Source Pavilion, the most complete and best source code, algorithms, tutorials, software tools, the database around you.)