Generally, admission into M2-ACN is exceptional, and conditioned on your previous studies meeting the prerequisites for admission. (generally, good networking knowledge and good basis in computer science and probably theory). If they do, and if your academic record is excellent, then yes, admission directly into M2-ACN is possible.
Generally, however, unless your previous studies were specifically in networking, you will be having a very hard time following the M2-ACN, and with a low probability of success. In that case, we recommend admission into M1-ACN, which (when successfully completed) can lead into M2-ACN.
You must fill-in an application form on the university of Saclay web site.
For the full ACN master’s degree, select the “Jacques Herbrand” program and specify you apply to the “ACN” program explicitly in your motivation letter.
For the second-year (M2), select “M2 ACN” program.
You may apply to a scholarship at the same time with this application form.