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Interview Questions and Answers :: Cisco

Home > Experience Archives > Cisco > Interview Question Set 3
First Round (F-2-F) Second Round (F-2-F) Third Round (F-2-F)
Question :: 1
Write a Program to insert a node in a linked list in a sorted manner.

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Question :: 2
Write a Program to Search and delete a node from linked list based on data value.

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

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

assuming 2 numbers are

a = 10

b = 20

# 1. Summing up two numbers and store in 'a'

a = a b

# 2. swap b by subtracting b value from above a value

b = a - b  # b = 30 - 20  = 10

# 3. get a value swapped

a = a - b # a = 30 - 10 = 20

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Question :: 5
Write a Program to count the number of SET bits in an integer.

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Question :: 6
Write a Program to swap two variables without using 3rd variable.

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

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

argc contains count of argument

argv contains list of arguments

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

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Question :: 10
Write your own Strcpy and strncpy.

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Question :: 11
Write a Program to implement strcat() or strstr() equivalents in your own program

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First Round (F-2-F) Second Round (F-2-F) Third Round (F-2-F)
Question :: 1
Briefly Introduce yourself.

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Question :: 2
What are the various segments of RAM memory and their significance/usage?

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Question :: 3
IOS versus Linux - important points.

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Question :: 4
What are PP processes in IOS?

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Question :: 5
What is flat memory architecture?

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Question :: 6
Is IOS an RTOS?

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Question :: 7
What is the difference between array of pointers and pointer to an array. Give example of usage.

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Question :: 8
What is stack corruption? Given example.

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Question :: 9
What is the difference between Mutex and Semaphore?

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Question :: 10
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.

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Question :: 11
Write a sample program having 2 processes communicating using message queues.

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Question :: 12
fork(), exec(), signal() calls what do they do? Give examples in pseudo code

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First Round (F-2-F) Second Round (F-2-F) Third Round (F-2-F)
Question :: 1

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Question :: 2
What are ARP and gratuitous ARP?

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Question :: 3
How does ping work?

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Question :: 4
How does Trace-route work?

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Question :: 5
What does an ARP table look like? Contents?

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Question :: 6
What is a routing table? What does it look like?

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

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