Hello,
Yes, you are eligible to pursue B.Tech Cyber Security after completing Diploma. But you must have passed three year or four year Diploma in Engineering from an institute recognized by AICTE or equivalent board in order to be eligible. If you pass Diploma in Engineering from an institute recognized by AICTE or equivalent board you can get admission to second year B.Tech through lateral entry. The admission to second year B.Tech (lateral entry) will be either done in state level or institute level depending on the institute. In states like Andhra Pradesh and Telangana an entrance examination will be conducted for admission to second year B.Tech (Lateral entry). To secure admission you must fulfill the eligibility criteria specified by the institute. Here is the link to check the list of entrance examination and its eligibility criteria
https://engineering.careers360.com/articles/what-btech-lateral-entry-eligibility
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