Cisco Interview Question Part-1

Cisco Interview Questions

Kindly find below the most frequently interview question from the c programming, Operating system, networking asked in various company.
Here the below listed question asked in Cisco. We hope it will help you to crack interview.  

C Programming

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1.Program to insert a node in a linked list in a sorted manner.

2.Search and delete a node from linked list based on data value.

3.Program to reverse the linked list and display the reversed linked list nodes.

4.Program to swap the 2 nibbles of a byte size variable.

5.Program to count the number of SET bits in an integer.

6.Program to swap two variables without using 3rd variable.

7.Allocating memory for a 2D array where number of rows and columns is dynamically decided.

8.What are the contents of argc and argv[]?

9.What is the difference between array of pointers and pointer to an array. Write the declarations.

10.Strcpy, strncpy, strcat etc.

11.What is the difference between array of pointers and pointer to an array. Give example of usage.

12.Program to implement strcat() or strstr() equivalents in your own program

Operating System

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1.What are the various segments of RAM memory and their significance/usage?

2.IOS versus Linux - important points.

3.What are PP processes in IOS?

4.What is flat memory architecture?

5.Is IOS an RTOS?

6.What is stack corruption? Given example.

7.What is the difference between Mutex and Semaphore?

8.Write a sample program having two processes using semaphore to synchronize the access to a common resource. Use a C structure as the shared resource.

9. Write a sample program having 2 processes communicating using message queues.

10. fork(), exec(), signal() calls – what do they do? Give examples in pseudo code

Networking

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1.What are the important contents of IP header, MAC header, MPLS header?

2.What are ARP and gratuitous ARP?

3.How does ping work?

4.How does Trace-route work?

5.What does an ARP table look like? Contents?

6.What is a routing table? What does it look like?

7.What is the role of routing protocols like OSPF/IS-IS/BGP?

8.What is MTU and MRU significance?