Cisco Most Frequently Asked Interview Questions

Cisco most Frequently Asked interview question in various interview

,We heartily Thanks to our couple of Visitors who shared these questions with Q4Interview.

1.    Reverse a string in C using as little additional memory as possible.

2.    Setting, Clearing and Toggling a single bit in a value..?

3.    Difference between macro and inline functions ?

4.    Find nth node from last in single linked list

5.    How will you implement macro sizeof    

6.    How will you organize 1 lakh numbers??

7.    Difference between little endian and big endian,write a code that tells you machine is little or big endian ??

8.    What is NAT   ??

9.    What things will you keep in mind while writing a high level design ??

10. How will you allocate a memory to 2d integer array ??

11. What is alignment ??

12. How will you align an allocated pointer ??

13. Write a code for reversing a linked list, recursive and non-recursive.

14. How to find whether a machine is 32bit or 64 bit? Write code for this..??

15. What is Y shape linked list.. ??

16. How will you implement a linked list library using void pointers? Write the complete code

17. Sorted array is given, find 2 nos whose sum equals X ??

18. Complement the odd bits in a byte                                         

19. How does traceroute works                                                     

20. What are the different means of IPC in linux kernel                 

21. What is difference between process and threads                                 

22. What is difference between const char *, char const * etc...    

23. Write a code to merge two sorted linked lists                          

24. If ttl is set to 15 and we have 10 machines, and each machine takes 2 seconds to process the packet, will the packet reach the end point?                        

25. Single linked list questions

26. Given a pointer to node in linked list, no start pointer is given,

27. how would you delete the node ??     

28. To detect a loop in linked list? How many ways can you do that       

29. Find the middle node in the linked list                                                                          

30. In binary search tree parent pointer is given, given is pointer to 2 nodes, find their least common successor. If we go up the tree its a Y shape linked list question, not a tree question.

31. What is 1 and 2's complement

32. How is -1 stored in computer

33. What is masking?

34. What is IP fragmentation? How will you assemble and identify packets which are fragmented?

35. What are storage classes in C

36. What are volatile variables, when to use them

37. How will you make blocking call in C

38. What does FD_ISSET do

39. How will you send a RAW IP packet

40. How will you send a RAW MAC packet

41. When PF_PACKET is used

42. What is difference between hub and bridge

43. Can gdb be used to debug inline functions? How

44. What are ICMP redirects?

45. What is active and passive ftp? Which ftp will work when we are behind a NAT machine (compression fails behind a NAT machine and we have a separate function to bypass such packets, nat_adm_ctrl)

46. What is port forwarding

47. When to use SNAT and DNAT

48. What happens when we open a web page in terms of packet and OSI flow

Reedem Software Interview Question

Redeem Software Interview Questions

Kindly find below the telephonic round <i.e first round> with redeem software, we are in process of updating the second round question i.e at skype, once we had question with us.


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for that you revisit to the page.
1.  Question like "introduce your self" was included this time.
2.  Directly he through the question from current project. <you must prepare the current project>
     a. Briefly explain about the current project and you role in it.
  b. Then there were some project specific questions. like why this, how / why this not/how.
3.  There was one question from previous project.
4.  What is ARP, can you explain its working procedure.
5.  What are the field in ARP table, can we add ARP entry, if so than how.
6.  What is proxy-ARP. Whey we need it.
7.  what is vlan.(why we create vlan,) Does VLAN was involved in you current project, if so can you explain its working steps in your project.
8.  what is pvid, why we need it.
9.  How PKT will be assumed <by switch> that it is tagged/untagged packet, how forwarding happen.
10. How the ARP will be used in this VLAN.
11. What is RARP ?
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12. Do you have idea, how routing happen, how router work.
13. What is basic difference in routing and switching.How it will differ in term of VLAN forwarding <routing/switching>
14. There is one topology like.
      Host A ---- Router A -------- Router B ------ Host B
 Have to communicate from Host-A to Host-B,i.e ping Host B from Host B. What are all the steps performed for it.
15. What if Host B is in different subnet, And what if it is in same Subnet.
16. Can we enable Proxy-ARP at any of router.
17. What are the learning will be in routing table of Router A and Router B
18. Do you know MPLS, what is it.
19. what is difference in process and thread.
20. Do you know how to create the thread. what are the parameter to pass to create thread (pthread).
21. once we create the thread, whether we will be in main thread or created thread. How we can identify that which thread we are accessing .
22. How time sharing take place for these thread.
23. Instead of creating multi-threads, can not we create multi-process,what are the problem/benefit we will have.
24. If you have to store the subnet mask, what mechanism you will used.<i.e how you will store it in c>
25. what is volatile.
26. Then there were some normal questions.

These are the questions in telephonic discussion with Redeem Software. There were one more round to go. Soon we will update the same.
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It will be nice if you share your interview experience with us. You Experience might help to someone.

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