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AWS interview practice

Covers EC2, S3, IAM, Lambda, VPC, cost and reliability. Questions are written for real interviews at junior, mid and senior level.

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15 multiple-choice questions · 15 minutes · instant score with explanations

Sample AWS interview questions

Three questions from the bank, with answers. The practice test draws different ones each time.

Question 1 · Cost Optimization · junior

Which EC2 pricing model provides a significant discount (up to 72%) in exchange for a 1-year or 3-year hourly usage commitment?

  1. A.Spot Instances
  2. B.Reserved Instances
  3. C.Dedicated Hosts
  4. D.On-Demand Instances
Show answer

B. Reserved Instances

Reserved Instances and Savings Plans offer significant discounts compared to On-Demand pricing in exchange for a 1-year or 3-year commitment. Spot instances are cheaper but can be terminated at any time.

Question 2 · VPC & Reliability · junior

Which type of AWS Elastic Load Balancer operates at Layer 7 and supports intelligent routing based on HTTP headers and URL paths?

  1. A.Network Load Balancer
  2. B.Application Load Balancer
  3. C.Classic Load Balancer
  4. D.Gateway Load Balancer
Show answer

B. Application Load Balancer

An Application Load Balancer operates at Layer 7 and can route HTTP/S traffic based on path patterns (e.g., /images vs /video) or host headers. Network Load Balancers operate at Layer 4 (TCP/UDP).

Question 3 · VPC · junior

Which VPC component allows EC2 instances in a private subnet to securely access the public internet for software patches while blocking inbound connections from the internet?

  1. A.VPC Endpoint
  2. B.Security Group
  3. C.Internet Gateway
  4. D.NAT Gateway
Show answer

D. NAT Gateway

A NAT (Network Address Translation) Gateway allows instances in a private subnet to initiate outbound connections to the internet (e.g., for software updates) while preventing unsolicited inbound connections from the internet.

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