There are very few colleges that offer M.Tech in Network Technology, there is a course named M.Tech in Mobile Communication and Network Technology offered in Guru Nanak Institute, Kolkata. There is another course named M.Tech in Networking and Cloud Computing offered by Alliance College of Engineering and Design, another course offered by JSS College, Mysore which is M.Tech in Network and Internet Engineering. I guess it helps!!! Have a look at all three of them.

Good luck!!

https://www.careers360.com/colleges/guru-nanak-institute-of-technology-kolkata/mtech-mobile-communication-and-network-technology-course

https://www.careers360.com/colleges/alliance-college-of-engineering-and-design-bangalore/mtech-networking-and-cloud-computing-course

https://www.careers360.com/university/jss-science-and-technology-university-mysuru/mtech-network-and-internet-engineering-course