Wipro Interview Questions

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I would like to share the interview exp/question recently held for Wipro,at 3-5 years exp for L2/L3 protocol dev. Basically there were two technical and one HR round, HR was jsut formality
and about joining date etc. 

First Round
----------- 
1. Introduce yourself briefly. 
2. How ping works.which protocol used in it.
3. What is NAT.
4. Write a program to reverse a number, input 12345 output 54321.
5. Write a program to find the loop in a single linklist.
6. Now Modify your program to remove the loop in same linklst. 
7. What is dangling pointer. So As per him in question 6 it will occurred. 
8. What is deadlock.
9. Write a program in which deadlock created. there were two question ... like how you will identify it, and avode it. 
10. Write a program to delete a node in double linklist if info match. 
11. what are the procedure to allocate the memory dynamically in c. 
12. what are the difference in malloc, calloc and realloc.
13. what are the scheduling technique available. 
14. What are the interprocess communication available. 
15. In pipe IPC, whether first pipe get terminated or still in BG. 
16. what is shell.
17. How to protect the shared memory. 
18. Do you know the GDB. Where it will be used. how you will load. 
19. How you will have the core dump, what are all the information you will get it, how you will debug it. 
20. Do you know chunk file. 
21. what is fork(). what fork will return, whether parent will run first or child when you will do fork. 
22. What is NULL pointer. 
23. What is void pointer. 
24. Can you write a generic single linklist program using void.
25. JUMP,breakpoint, next,continue etc. in GDB, what is 
26. Do you know the socket programming, Write a simple client/server program.
27. What are the call will be in UDP.
28. How TCP handshake will be happen. 
29. What is fragmentation in IP packet. Then what is it in OS context.  
30. What is priority inversion.
31. What is ARP, what are the filed in ARP table ,how it will updated. 
31. Do You have any questions, Wait for another round.  


Second round
------------ 

1. Introduce yourself briefly, and about current project .
2. So some questions from resume, some question directly from resume.
3. Can you explain how NAT work . What is PNAT.
4. He draw a topology, it was like below, so he ask me to explain pinging from host A to B by keeping mind that there is vlan and STP. 
then there question from stp,vlan, mac-address table, arp, L2 pkt format etc.
   HOST-A ----- SWITCH-1 ------SWITCH-2------HOST-B
                  \                /  
                   \              / 
                    \            /
                      SWITCH-3 

5. What configuration you will do at switch 1/2/3 . 
6. mac-address table learning in each switch. 
7. STP port role and port state. How root bridge elected, will root bridge will have root port. 
8. In listening stage, will it learn the mac-address. 
9. What is vlan, what is access, trunk port.which port in topology will be trunk port and which one will be access port. 
10. What is RSTP. difference in RSTP and STP.
11. Do you know the MSTP and PVSTP. 
12. what are the filed in vlan pkt.
13. Can a port be a part of multiple vlan.
14. What is untagged port mean.
15. What is LACP. what is difference in LAG and LACP.
16. Can you explain ping from host A to b when channel is between switch 1 and 2. 
17. How you generate the pkt, for L2 pkt what are the field you update in ixia. 
18. How the pkt handle in code.
19. What is interrupt handler. 
20. Do you know MPLS. 
21. How you will identify memory leak in program. 
22. OSI layers. explain with example. then he ask me to explain in previous topology. 

HR Round (Final round)
---------------------- 
1. He gone through the resume and ask some simple questions.
2. when you can join us. 
3. Reason to leave the current company. 
4. Then some question related to work. environment in Wipro, expectation of Wipro.
5. Do you have any Question. 

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