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 Q211. How does AWS Lambda handle failure during event processing?Amazon Web Services (AWS)
Ans. In AWS Lambda we can run a function in synchronous or asynchronous mode. In synchronous mode, if AWS Lambda function fails, then it will just give an exception to the calling application. In asynchronous mode, if AWS Lambda function fails then it will retry the same function at least 3 times.If AWS Lambda is running in response to an event in Amazon DynamoDB or Amazon Kinesis, then the event will be retried till the Lambda function succeeds or the data expires. In DynamoDB or Kinesis, AWS maintains data for at least 24 hours.

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   Like         Discuss         Correct / Improve     aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda

 Q212. Why is cloud infrastructure so powerful ?Cloud Computing
Ans. Because it gives the ability to provision infrastructure on Demand with No contracts and strings attached.

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   Like         Discuss         Correct / Improve     Amazon Web Service (AWS)   Google Cloud Platform (GCP)

 Q213. What are the advantage of having Edge Locations ?Amazon Web Services (AWS)
Ans. It saves Network traffic and facilitates faster delivery by hosting bulk media and cached data near to client.

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   Like         Discuss         Correct / Improve     aws edge locations

 Q214. Within AWS S3, Why new files are available immediately for read operation but not the updates ? Amazon Web Services (AWS)
Ans. Because new files will be fed from where ever they are first available but AWS have no way to identify which is the most updated version among the various regions. The updated version can only be assured once the replication to all availability zones is complete.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3

 Q215. What kind of Access Policy should be kept on S3 Buckets and Policy ?Amazon Web Services (AWS)
Ans. We should only allow access that's needed. So the security Policy should be as restrictive as possible.

Buckets and Files should never be made public unless until they are needed it to be like that.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3

 Q216. How can we protect from accidental deletes in S3 ?Amazon Web Services (AWS)
Ans. Versioning ( will create Delete marker )
MFA Delete ( authentication upon deletion )
Cross Region Replication ( Replicates aren't deleted )

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3

 Q217. How can we restrict CloudFront access to a particular Geography ?Amazon Web Services (AWS)
Ans. We can select the appropriate Price Class if that suits us.

We can do Geo Targeting by black listing / white listing certain geographies.

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   Like         Discuss         Correct / Improve     aws cloudfront  amazon cloudfront

 Q218. What is the use case for "On Demand" EC2 ?Amazon Web Services (AWS)
Ans. If the computation required is Spiky and unpredictable.

If it's first time use.

If the lifespan of the application isn't known.

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q219. What is the use case for "Spot" EC2 plan ?Amazon Web Services (AWS)
Ans. If the usage is non continuous and have flexible start and End Time. For ex - Analysis , Research , mining etc.

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2 spot

 Q220. What are the different price options available for EC2 ?Amazon Web Services (AWS)
Ans. On Demand
Reserved
Spot
Dedicated Host

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q221. What EC2 configuration would you use if you have to use it for Bitcoin mining ?Amazon Web Services (AWS)
Ans. Keeping Low cost for processing , i would choose

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q222. Which AWS services would you use if you have find a cheapest solution for an analytics application ?Amazon Web Services (AWS)
Ans. Computation

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

Storage

S3-IA

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   Like         Discuss         Correct / Improve     aws computation  aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q223. Can a EC2 instance have multiple Security Groups ? Can a single security group be assigned to multiple Ec2 instances ? If either of them is true , doesn't it result in conflict ?Amazon Web Services (AWS)
Ans. We can assign multiple security groups to single instance and we can use single security group with multiple instances.

It never results in conflict as security groups only have allow rules and no deny rules. Multiple security groups for an instance results in union of all rules.

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2  aws security group

 Q224. Difference between S3 and EFS ?Amazon Web Services (AWS)
Ans. S3 is object based whereas EFS is block based.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3  aws efs

 Q225. What is an object's lock and which object's have locks?
Ans. An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have locks. A class's lock is acquired on the class's Class object.

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   Like         Discuss         Correct / Improve     java   threads   multi threading   scheduling   synchronizing

  Q226. What is JSON ?Json
Ans. JSON is "JavaScript Object Notation", primarily used for client-server or server-server communication. Its a much lighter and readable alternative to XML. JSON is language independent and is easily parse-able in all programming languages.

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   Like         Discuss         Correct / Improve     json   markup language   client server communication     Asked in 26 Companies      basic        frequent
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 Q227. Which function is used to convert a JSON text into an object ?Json
Ans. eval

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   Like         Discuss         Correct / Improve     json   markup language

 Q228. Which data types are supported by JSON ?Json
Ans. Number
String
Boolean
Array
Object
null

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   Like         Discuss         Correct / Improve     json   markup language   client server communication

 Q229. What is URL?
Java EE
Ans. URL is Uniform Resource Locator which is representation of HTTP address.

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   Like         Discuss         Correct / Improve     j2ee   http   internet   url      basic        rare

 Q230. What is HTTP ?Java EE
Ans. HTTP or Hypertext Transfer Protocol is internet protocol for tranmission of hypertext ( text with meta data ) over internet.

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   Like         Discuss         Correct / Improve     j2ee   http   internet  fidelity     Asked in 2 Companies      basic        frequent

 Q231. Is tomcat an application or Web server ?Server
Ans. Tomcat is a web server and a Servlet container. It is often used as an application server for web-based applications but does not include the complete suite of capabilities that a Java EE application server would supply.

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   Like         Discuss         Correct / Improve     tomcat   j2ee   web server   application server   build management

 Q232. What are the default or implicitly assigned values for data types in java ?
Ans. boolean ---> false
byte ----> 0
short ----> 0
int -----> 0
long ------> 0l
char -----> /u0000
float ------> 0.0f
double ----> 0.0d
any object reference ----> null

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 Q233. Which access specifier can be used with Class ?Core Java
Ans. For top level class we can only use "public" and "default". We can use private with inner class.

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   Like         Discuss         Correct / Improve     java   class   access specifier   inner classes      basic        frequent

 Q234. What is meant by an "asynchronous event." Give some examples ?Operating System
Ans. An asynchronous event is one that occurs at an unpredictable time outside the control of the program that the CPU is running. It is not "synchronized" with the program.

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   Like         Discuss         Correct / Improve     j2ee   internet   web application   asynchronus   asynchronus communication   architecture     Asked in 1 Companies

 Q235. How to display and set the Class path in Unix ?
Ans. To display the current CLASSPATH variable, use these commands in UNIX (Bourne shell):

% echo $CLASSPATH

To delete the current contents of the CLASSPATH variable,

In UNIX: % unset CLASSPATH; export CLASSPATH

To set the CLASSPATH variable,

In UNIX: % CLASSPATH=/home/george/java/classes; export CLASSPATH

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   Like         Discuss         Correct / Improve     unix   unix commands   classpath

 Q236. Different ways of implementing Threads in Java ?Core Java
Ans. Threads in Java can be implement either by Extending Thread class or implementing runnable interface.

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   Like         Discuss         Correct / Improve     java   threads   multi threading     Asked in 1 Companies      basic        frequent

 Q237. What is a Final Method ?Core Java
Ans. A Method that cannot be overriden in the sub class.

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   Like         Discuss         Correct / Improve     java   oops   java keywords   final   final method   overriding   basic interview question      basic        frequent
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Very Frequently asked.Favorite question in Walk in drive for many Indian service companies.
 Q238. What is a Final Class ?
Ans. A Class that cannot be sub classed.

  Sample Code for final class

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Very frequently asked. Usually asked with questions related to String. Frequently asked at CTS / Cognizant
  Q239. What is an Immutable Object ?Core Java
Ans. Object that can't be changed after instantiation.

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   Like         Discuss         Correct / Improve     java   oops   immutable  immutability     Asked in 27 Companies      basic        frequent
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 Q240. Does Declaring an object "final" makes it immutable ?Core Java
Ans. Only declaring variables as final makes them immutable. Making objects final means that the object handler cannot be used to target some other object but the object is still mutable.

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   Like         Discuss         Correct / Improve     java   oops   final   immutable  immutability   immutable  immutability object

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