Network engineers can get a blue card. As long as you have a university degree, job and fulfil the minimum salary requirement, you can apply for the blue card.
Here is an excerpt from the official website of Berlin.
The amount you need to earn depends on your job.
If you work in a shortage occupation, you need to earn EUR 3,588 gross per month or more. (This equates to EUR 43,056 per year.) Shortage occupations are specific occupations for which there are not enough workers in Germany. These professions at present are: Scientists in natural science disciplines, mathematicians, architects, interior, urban and traffic planners, designers, engineers, scientific engineers, physicians (except dentists), and those with academic qualifications in information and communications technology.
If you are working in another profession, you will need to earn EUR 4,600 gross per month or more. (This equates to 55.200 Euro per year.)