Waterlabs AI Interview Questions and Answers

Q1. PySpark and SQL questions
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Q2. Azure datafactory related questions
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Q1. Spark internals
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Q2. Scenario based
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Q1. Soft skills
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Q2. Scenario based and general discussion
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Q1. How many EBS can be attached to single EC2
Ans. 
The maximum number of EBS volumes that can be attached to a single EC2 instance is 40.
• Maximum of 40 EBS volumes can be attached to a single EC2 instance

• Each EBS volume can be up to 16 TiB in size

• EBS volumes can be attached and detached while the instance is running
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Q2. Prerequisites for S3 Cross Region Replication
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Prerequisites for S3 Cross Region Replication include enabling versioning, configuring IAM roles, and ensuring proper bucket policies.
• Enable versioning on both source and destination buckets

• Configure IAM roles with proper permissions for replication

• Ensure proper bucket policies are in place for cross region replication
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Q3. Docker Restart will change which attributes of comtainer
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Docker Restart changes the container's attributes like IP address, hostname, and uptime.
• IP address of the container will change after restart

• Hostname of the container may change

• Uptime of the container will be reset

• Any changes made to the container's filesystem will be lost
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Q4. S3 vs EFS scenario based use cases.
Ans. 
S3 is ideal for storing static files like images and videos, while EFS is better for shared file storage among multiple EC2 instances.
• S3 is object storage, suitable for storing large amounts of unstructured data like images, videos, backups, and logs.

• EFS is a file storage service that can be mounted on multiple EC2 instances, making it ideal for shared file systems and databases.

• Use S3 for static website hosting, data ...read more
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Q5. Linux Commands and Chmod Calculation
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Q1. Find a number in array which is greater than left and right element
Ans. 
Iterate through array and check if element is greater than its adjacent elements
• Iterate through array and check if current element is greater than element at index-1 and index+1

• Return the first element found that satisfies the condition

• Handle edge cases where element is at the beginning or end of array
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Q2. Find the number in the string and return the sum of numbers
Ans. 
Find and sum numbers in a string
• Iterate through each character in the string

• Check if the character is a digit

• If digit, convert to integer and add to sum
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Mintu Babu lives in a smaller house than her brother and in a larger house than her parents. Her children reside with her, and she has no other relatives. If Mintu Babu's relative U lives in a larger house than her relative S, then all the following may be true except: \n\n1) S is U's father \n\n2) S is U's mother \n\n3) U is younger than S \n\n4) S is younger than U

Q1. 1. merge two linked list
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Q2. 2. reverse a linked list.
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Q1. Network concept basics
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Q2. Routing protocol,ospf
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Q1. Deep knowledge testing in networking domain
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Deep knowledge testing in networking domain involves understanding protocols, configurations, security measures, and troubleshooting techniques.
• Understanding various networking protocols such as TCP/IP, DNS, DHCP, etc.

• Knowledge of network configurations including routers, switches, firewalls, etc.

• Understanding network security measures like VPNs, encryption, firewalls, etc.

• Ability to troubleshoot network issues using t
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Q1. Can we perform data driven testing using postman
Ans. 
Yes, Postman supports data driven testing through the use of variables and data files.
• Postman allows users to define variables and use them in requests for data driven testing.

• Data files such as CSV or JSON can be imported into Postman to drive test data.

• Iterations can be set up in Postman to run tests with different data sets.
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Q2. Basic coding questions on integer array missing numbers
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Q1. About yourself ?
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Q2. Just asked questions on previous role
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Q3. How many types of IOT devices are there
Ans. 
There are three main types of IoT devices: consumer, commercial, and industrial.
• Consumer IoT devices: Smart home devices like thermostats, lights, and security cameras.

• Commercial IoT devices: Smart meters, asset tracking systems, and connected vending machines.

• Industrial IoT devices: Sensors and actuators used in manufacturing, agriculture, and healthcare.
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