Hey Rohith ,
Greetings!

Here below I am mentioning the top colleges offering Mtech in Computer Network Engineering :-

• Government College of Engineering ,Thiruvananthapuram
• Gurunanak Institute of Technology , Kolkata
  
• Kalasalingam University , Virudhunagar
  
• Mangalam College of Engineering , Kottayam
  
• Manipal Institute of Technology , Udupi
• Rajagiri School of Engineering and Technology , Kochi
  
• Sree Narayana Gurukulam College of Engineering , Ernakulum
  
• Sri Manakula Vinayagar Engineering College , Pondicherry
  
  Source : https://collegedunia.com/courses/master-of-technology-mtech-computer-network-engineering
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  Hope this will help . Good Luck ! You can reply to this comment if you have any further queries , I will be happy to help .