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Interview Questions for Tech Mahindra – Network Engineer L1

Preparing for both HR and Technical Rounds is essential. Below are potential questions:

TECHNICAL INTERVIEW ROUND (TR) – FOR FRESHERS

Core Networking Concepts

  1. What is a subnet mask? How does it work?

    • Explanation: Subnet mask is used to divide an IP address into network and host portions. For example, 255.255.255.0 means the first three octets are network bits.

  2. Explain the difference between a switch and a router.

    • Answer:

      • Switch: Works at Layer 2, connects devices in a LAN, forwards based on MAC address.

      • Router: Works at Layer 3, connects different networks, forwards packets based on IP address.

  3. What is the difference between TCP and UDP? Give examples.

    • Answer:

      • TCP: Connection-oriented (e.g., HTTP, FTP), reliable.

      • UDP: Connectionless (e.g., DNS, VoIP), faster but less reliable.

  4. What happens when you type www.google.com in a browser?

    • Covers:

      • DNS Resolution

      • TCP Handshake

      • HTTP Request/Response

      • Rendering in browser

  5. What is the purpose of IP addressing? Explain public vs. private IPs.

  6. What command is used to check connectivity to a website or IP?

    • Answer: ping – used to test network reachability and latency.

  7. Explain ARP and how it functions in a LAN.

  8. Explain DHCP. What happens when you connect a device to Wi-Fi?

Troubleshooting-Based Questions

  1. A user can't access the internet, but other users can. How would you troubleshoot?

    • Check cable, IP settings, ping gateway, check DNS, disable/enable adapter.

  2. What does the command ipconfig /all do?

  3. If your ping to 8.8.8.8 fails, but local pings work, what does that mean?

    • Likely internet or gateway issue.

  4. Difference between ping, tracert, and nslookup.

Tools & Hands-on

  1. Have you configured a router or switch in labs?

    • Expected answer includes basics of VLANs, port configuration.

  2. Explain the use of Wireshark.

🔹 TECHNICAL INTERVIEW ROUND (TR) – FOR EXPERIENCED (1–2 Years)

Advanced Networking Questions

  1. How do you configure a static IP address on a network interface in Windows/Linux?

  2. Explain how NAT works and the types of NAT.

  3. Difference between static routing and dynamic routing.

  4. Have you worked with firewalls? Explain basic firewall rule configuration.

  5. What is VLAN tagging and how is it implemented?

  6. Explain how DNS caching works.

  7. What is MTU and how does it affect performance?

  8. What are common port numbers and their use (e.g., 80, 443, 22, 53, 25)?

  9. How do you identify and resolve a broadcast storm?

  10. Explain three-way TCP handshake with packet-level detail.

Real-World Scenarios

  1. Scenario: You receive an alert that a switch is down in a remote office. What do you do?

  2. Scenario: Users report slow internet access. How would you diagnose the issue?

  3. Explain how to trace a packet from source to destination using tools.

  4. You’re setting up a new network in an office. How do you plan the IP addressing?

🔹 HR INTERVIEW QUESTIONS – FOR FRESHERS

  1. Tell me about yourself.

  2. Why do you want to work at Tech Mahindra?

  3. What do you know about the role of Network Engineer – L1?

  4. Tell me about a time when you worked on a team project.

  5. What are your strengths and weaknesses?

  6. Are you open to relocation and night shifts?

  7. Where do you see yourself in 5 years?

  8. Why should we hire you over others?

  9. Explain a challenging situation you’ve faced and how you overcame it.

  10. Do you have any certifications? How did you prepare for them?

🔹 HR INTERVIEW QUESTIONS – FOR EXPERIENCED (1–2 YEARS)

  1. Walk me through your resume.

  2. Why are you looking to switch from your current company?

  3. What projects have you handled end-to-end in your previous role?

  4. What is your notice period? Are you flexible to join early?

  5. Have you worked night shifts or rotational shifts before?

  6. Describe your work ethic and approach to deadlines.

  7. Tell me about a conflict you had at work and how you resolved it.

  8. How do you stay updated on networking technologies?

  9. Have you ever had to troubleshoot a major outage? Walk me through the incident.

  10. Why Tech Mahindra? What do you know about our network operations?

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