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Interview Questions and Answers :: HCL Technologies

Home > Experience Archives > HCL Technologies > Interview Question Set 6
Second Round (Telephonic)
  • 1. Introduce yourself and current project activities.
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  • 2. How to find the loop in Single linked list, and how to resolve it. Explain each steps.
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  • 3. Which is efficient in respect to searching AVL tree or RED BLACK tree.
  • Answer:
    RB-Trees are, as well as AVL trees, self-balancing. Both of them provide O(log n) lookup and insertion performance.
    In respect to searching AVL tree is efficient then Red-Black Tree because they are more rigidly balanced.. The path from the root to the deepest leaf in an AVL tree is at most ~1.44 lg(n+2), while in red black trees it's at most ~2 lg (n+1).
    But if your application required frequent insertions and deletions, then Red Black trees should be preferred over AVL tree.
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  • 4. What is big endian and little endian, Why we use little endia/big endia, How to identify which machine is little or big endian,
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  • 5. What is volatile keyword, can we use constant and volatile together.
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  • 6. Suppose below data I have to send from Machine A to B, where machine A is (big-endian machine) and machine B (little endian) machine, and without converting to data, which element of structure will be corrupted at little endian machine.
    struct
    {
    unsigned int x;
    unsigned int y;
    char d;
    char p;
    unsigned int z;
    }
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  • 7. Can we not optimize the volatile variable?
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  • 8. Where the global static variable, global variable, local variable, local static variable and volatile variable will be stored.
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  • 9. When we put volatile what does compiler understand.
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  • 10. What mechanism you will use to debug memory leak issue.
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  • 11. How Valgrind track for memory leak. Valgrind work at run time or compile time.
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  • 12. Order of evaluation, assume in an expression you have ++ -- and (), what will be execution order.
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  • 13. How does sizeof operator calculate the size of variable, can you create your own size of operator.
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  • 14. How does ARP work, what work you have done?
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  • 15. How does ping happen from HOST-A to HOST-B in below topology.
    HOST-A ------- [Router] -------- [Router] ------- HOST-B
    A) When both host are in same subnet.
    B) When Host are in different subnet.
    C) What if replace both router to switch explain scenario (A) and (B).
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  • 16. Do you know local mac-address/Global mac-address?
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  • 17. What is VLAN and how does it work, why we need VLAN, if we had subnet.
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  • 18. What is native vlan? What is vlan pkt format, explain in details.
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