Tech Mahindra Sr. Software Engineer interview questions

Interview scheduled for Noida office location. I have cleared all round(2 Technical round) easily and got +ve feedback from Interviewer . Even I have seen that Interviewer have written "Excellent" on top of Resume and passed to HR. But after some time HR came and told me that You have rejected . i got shocked and told him to check it again. and he checked and the told same thing. I requested him to show me my resume. On top of the resume that line was crossed by red pen . and this is the experience of mine

Q1. What do you mean by Network? ... Q2. What do you mean by Node? ... Q3. What do you mean by Network Topology? ... Q4. What is Routers? ... Q5. What is the OSI model? ... Q6. Explain the Different layers of the OSI model. ... Q7. Describe Hub, Switch and Router? ...