Basically, certification distinguishes you as a professional who is serious about practical learning in today's atmosphere of intense competition, which makes you a valuable asset to a potential employer. Here you are asking which certification is best for network engineers. Well, there are many certifications available for this technology like AWS, GCP, Azure, and so on. Do check out the various cloud computing certification courses offered by Intellipaat.
Before that do check out this video on how the AWS certification course helped Simant Shantilal Shah's network engineer career -