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Q3171. how to switch to the parent webpage?

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Q3172. What can be done to protect the application from DDOS attack ?

Security

Ans. We can set the max number of requests from a given IP or an IP range

We can set the time out so that a single request cannot hold on to resources for too long.

We can identify patterns ( like too many requests from single IP for single page ) and then block such requests.

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Q3173. What is your opinion about caching ?

Design

Ans. Caching is a mechanism that provides faster access but at the cost of additional space. Caching is good if we need faster access and if it takes extensive processing to come to a value which doesn't gets changed frequently.

Caching could be an overhead if we don't need fast access or if the processed value changes too frequently.

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Q3174. What are Hooks in programming and Design Patterns ?

Design

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Q3175. What is SNMP ?

Networking

Ans. SNMP or Simple Network Management protocol is an application layer protocol for exchanging management information between network devices.

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Q3176. what is dynamic method dispatch

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Q3177. what is green threads

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Q3178. What is java machine control

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Q3179. What is a composite primary key and foreign key ?

Database

Ans. The combination of values from multiple columns in the composite primary key must be unique for each row in the table.
A foreign key, on the other hand, is a field or set of fields in one table that refers to the primary key in another table. It establishes a relationship between two tables based on the values of the foreign key and the primary key.

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Q3180. What is ado.net ?

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Q3181. What is the use of toString method ?

Core Java

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Q3182. How multiple catch block works ?

Core Java

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Q3183. How does Garbage Collector work? What are the realizations of Garbage Collector.

Core Java

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Q3184. How to build applications and integrate with jenkins?

Jenkins

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Q3185. What is the O notation for the ArrayList and List? And which one would you choose to insert item in the middle?

Data Structure

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Q3186. How to sort an ArrayList of objects

Data Structure

Ans. Using Collections.sort()

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Q3187. Differentiate osi and tcp/ip models and describe them

Networking

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Q3188. what are system calls

Operating System

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Q3189. What is size of structure in c ?

C++

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Q3190. What are reference variables in c

C++

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Q3191. Explain memory allocation and deallocation.

C++

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Q3192. How many threads can access a concurrent hashmap when the hashcode is overridden and always returns a zero.

Data Structure

Ans. The impact of both cases (fixed hashcode or random hashcode for keys) will have same result and that is "unexpected behavior". The very basic need of hashcode in HashMap is to identify the bucket location where to put the key-value pair, and from where it has to be retrieved.

If the hashcode of key object changes every time, the exact location of key-value pair will be calculated different, every time. This way, one object stored in HashMap will be lost forever and there will be very minimum possibility to get it back from map.

For this same reason, key are suggested to be immutable, so that they return a unique and same hashcode each time requested on same key object.

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Q3193. Difference between Tomcat and IBM Websphere.

Server

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Q3194. All the meaningful words that can be formed from a phone keypad

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Q3195. What are the disadvantages of Maven ?

Maven

Ans. Maven requires installation in the working system and the Maven plug-in for the IDE.
If the Maven code for an existing dependency is unavailable, you cannot add that dependency using Maven itself.
Some sources claim that Maven is slow.

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Q3196. Write a program to find the intersection of four rectangles provided.

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Q3197. How to find if any employees address is null or not during Junit testing

JUnit

Ans. By using assertNotNull(employee_address)

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Q3198. How to find the duplicate elements in the list given

Ans. use collections.frequency() method to find out the frequency, if it is greater than 1 then it is a duplicate element.

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Q3199. Find the duplicate numbers and missing numbers in a given array of n numbers

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Q3200. FInd the longest palindrome in a given string

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