1What is the primary goal of Cloud-Native architecture?
A.To build and run scalable applications in modern, dynamic environments
B.To rely exclusively on physical hardware management
C.To build applications that run only on local servers
D.To increase the coupling between services
Correct Answer: To build and run scalable applications in modern, dynamic environments
Explanation:
Cloud-native technologies empower organizations to build and run scalable applications in modern, dynamic environments such as public, private, and hybrid clouds.
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2In the context of microservices, what does 'Loosely Coupled' mean?
A.Services can be deployed and updated independently without affecting others
B.Services are physically connected via cables
C.Services share a single database and memory space
D.Services must always be written in the same programming language
Correct Answer: Services can be deployed and updated independently without affecting others
Explanation:
Loose coupling ensures that changes to one service do not require changes to or downtime for other services, enabling independent deployment.
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3Which component is primarily responsible for keeping track of the network locations of service instances?
A.Load Balancer
B.API Gateway
C.Service Discovery
D.Circuit Breaker
Correct Answer: Service Discovery
Explanation:
Service Discovery is the mechanism used to locate network addresses (IP and Port) of available service instances in a dynamic environment.
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4What is the main function of a Load Balancer in a cloud-native environment?
A.To distribute incoming network traffic across multiple servers
B.To compile code
C.To discovery service registry locations
D.To store session data permanently
Correct Answer: To distribute incoming network traffic across multiple servers
Explanation:
Load balancers distribute traffic across multiple instances to ensure reliability, performance, and to prevent any single instance from being overwhelmed.
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5What is 'Horizontal Scaling' (Scaling Out)?
A.Adding more instances of machines/services to the resource pool
B.Replacing the hard drive with an SSD
C.Reducing the number of servers to save money
D.Adding more power (CPU, RAM) to an existing machine
Correct Answer: Adding more instances of machines/services to the resource pool
Explanation:
Horizontal scaling involves adding more nodes or instances to a system to handle increased load, which is a core concept of cloud-native systems.
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6According to the CAP theorem, which two guarantees are often chosen in distributed cloud microservices favoring high availability?
A.Consistency and Partition Tolerance
B.Availability and Partition Tolerance
C.Availability and Latency
D.Consistency and Availability
Correct Answer: Availability and Partition Tolerance
Explanation:
In distributed cloud systems (like microservices), Partition Tolerance is non-negotiable. Systems often choose AP (Availability and Partition Tolerance) over strict Consistency to ensure the system remains up during network issues.
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7Which of the following is NOT one of the Twelve-Factor App methodologies?
A.Disposability
B.Sticky Sessions
C.Codebase
D.Port Binding
Correct Answer: Sticky Sessions
Explanation:
Sticky Sessions are generally discouraged in the 12-Factor methodology because they hinder statelessness. The methodology advocates for stateless processes.
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8In the Twelve-Factor App methodology, how should configuration be managed?
A.Hardcoded in the source code
B.Kept in a text file committed to the repo
C.Stored in the environment variables
D.Stored in a separate database table only
Correct Answer: Stored in the environment variables
Explanation:
The 12-Factor App methodology states that configuration should be stored in the environment to separate config from code.
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9What is 'Serverless' architecture?
A.An architecture dependent on dedicated physical servers
B.A model where the cloud provider manages the allocation of machine resources dynamically
C.A system that runs entirely on the client's browser
D.An architecture where no servers exist at all
Correct Answer: A model where the cloud provider manages the allocation of machine resources dynamically
Explanation:
Serverless (like AWS Lambda) doesn't mean no servers; it means developers do not have to manage, provision, or patch the servers.
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10Which Netflix tool is famous for randomly terminating instances in production to ensure system resilience?
A.Hystrix
B.Eureka
C.Chaos Monkey
D.Zuul
Correct Answer: Chaos Monkey
Explanation:
Chaos Monkey is a tool invented by Netflix to test the resilience of its IT infrastructure by intentionally disabling computers in its production network.
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11Which pattern involves a database per service rather than a shared database?
A.Database per Service
B.Shared Repository
C.Data Warehouse
D.Monolithic Database Pattern
Correct Answer: Database per Service
Explanation:
To ensure loose coupling, microservices usually follow the Database per Service pattern so that services are not tightly bound by a shared schema.
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12In Service Discovery, what is the role of a 'Service Registry'?
A.To store the database credentials
B.To maintain a database of available service instances
C.To authenticate users
D.To balance the load between regions
Correct Answer: To maintain a database of available service instances
Explanation:
A Service Registry (like Eureka or Consul) is a database that contains the network locations of service instances.
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13What is 'Client-Side Discovery'?
A.The client connects to a Load Balancer which then routes the traffic
B.The client hardcodes the IP address of the server
C.The client broadcasts a message to the entire network
D.The client queries the Service Registry to get the location of a service instance
Correct Answer: The client queries the Service Registry to get the location of a service instance
Explanation:
In Client-Side Discovery, the client is responsible for determining the network locations of available service instances by querying a registry.
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14Which of the following describes 'Vertical Scaling'?
A.Distributing the database across regions
B.Adding more CPU or RAM to an existing single server
C.Adding more machines to the cluster
D.Using a Content Delivery Network
Correct Answer: Adding more CPU or RAM to an existing single server
Explanation:
Vertical scaling (scaling up) involves increasing the capacity of a single machine, which has physical limits compared to horizontal scaling.
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15What does the 'Disposability' factor in the Twelve-Factor App methodology emphasize?
A.Using temporary databases only
B.Fast startup and graceful shutdown
C.Code should be thrown away after use
D.Deleting logs immediately
Correct Answer: Fast startup and graceful shutdown
Explanation:
Disposability means the application can be started or stopped rapidly. This facilitates fast scaling, rapid deployment, and robustness.
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16Amazon's 'Two-Pizza Team' rule is related to which aspect of microservices?
A.API Rate Limiting
B.Load Balancing
C.Organizational Structure and Team Size
D.Database Sharding
Correct Answer: Organizational Structure and Team Size
Explanation:
Amazon's rule states that a team should be small enough to be fed by two pizzas, promoting small, autonomous teams that own specific microservices.
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17What is a 'Cold Start' in Serverless computing?
A.The latency experienced when a function is invoked for the first time or after a period of inactivity
B.Restarting a frozen physical server
C.The initial configuration of a cloud account
D.Booting up a computer in a cold server room
Correct Answer: The latency experienced when a function is invoked for the first time or after a period of inactivity
Explanation:
Cold start refers to the delay when the cloud provider has to spin up a new container to run a function that hasn't been called recently.
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18How does Uber manage the complexity of thousands of microservices?
A.Using a single shared database
B.Manually configuring IP addresses
C.Using a service mesh and rigorous RPC standards
D.By reverting to a monolith
Correct Answer: Using a service mesh and rigorous RPC standards
Explanation:
Uber utilizes sophisticated tooling, service meshes, and standardized Remote Procedure Calls (RPC) to manage communication between thousands of services.
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19In the Twelve-Factor App, how should 'Dependencies' be handled?
A.They should be ignored
B.They should be copied manually into the folder
C.They should be explicitly declared and isolated
D.They should be implicitly relied upon based on the OS
Correct Answer: They should be explicitly declared and isolated
Explanation:
Dependencies must be explicitly declared (e.g., via a manifest like package.json or pom.xml) and isolated to ensure consistent execution environments.
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20What is the 'Backing Services' factor in the Twelve-Factor App?
A.Services that are hardcoded into the application logic
B.Treating backing services (databases, queues) as attached resources
C.Services that back up data to tape drives
D.Running background services on the client machine
Correct Answer: Treating backing services (databases, queues) as attached resources
Explanation:
Backing services (like databases, caching systems, message queues) should be treated as attached resources accessed via a URL or other locator stored in config.
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21Which technology is most commonly associated with container orchestration in cloud-native development?
A.VMware
B.VirtualBox
C.Apache Tomcat
D.Kubernetes
Correct Answer: Kubernetes
Explanation:
Kubernetes is the industry standard for container orchestration, automating deployment, scaling, and management of containerized applications.
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22What does 'Polyglot Persistence' mean in the context of Data Management?
A.Using different data storage technologies to handle different data storage needs
B.Persisting data only in English
C.Writing data in multiple languages
D.Using a single database for all data types
Correct Answer: Using different data storage technologies to handle different data storage needs
Explanation:
Polyglot persistence allows microservices to use the best database tool for the specific job (e.g., SQL for transactions, NoSQL for documents, Redis for caching).
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23The 'Build, Release, Run' factor dictates that:
A.Build, release, and run stages must be strictly separated
B.You can change code directly in the running stage
C.Releases should not have unique IDs
D.Building and running happen simultaneously
Correct Answer: Build, release, and run stages must be strictly separated
Explanation:
Strict separation ensures that code changes are processed into an immutable build, combined with config to create a release, which is then executed.
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24What is the primary benefit of Autoscaling?
A.It reduces the storage size of the database
B.It ensures resources match the current demand automatically to optimize cost and performance
C.It guarantees code quality
D.It automatically writes unit tests
Correct Answer: It ensures resources match the current demand automatically to optimize cost and performance
Explanation:
Autoscaling dynamically adjusts resources based on load, saving money during low traffic and maintaining performance during high traffic.
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25In cloud-native apps, logs should be treated as:
A.Event streams
B.Text files stored on the local hard drive
C.Database tables
D.Emails sent to the admin
Correct Answer: Event streams
Explanation:
The Twelve-Factor App methodology states that logs should be treated as a stream of aggregated, time-ordered events, rather than managing log files manually.
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26Which consistency model is most common in cross-microservice operations?
A.Strong Consistency
B.Eventual Consistency
C.Immediate Consistency
D.ACID Consistency
Correct Answer: Eventual Consistency
Explanation:
Due to the distributed nature of microservices and the CAP theorem, systems often rely on eventual consistency to maintain high availability and performance.
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27Netflix Hystrix is an implementation of which pattern?
A.Factory Pattern
B.Observer Pattern
C.Circuit Breaker Pattern
D.Singleton Pattern
Correct Answer: Circuit Breaker Pattern
Explanation:
Hystrix is a library designed to control the interactions between distributed services by implementing the Circuit Breaker pattern to prevent cascading failures.
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28What is 'Dev/Prod Parity' in the Twelve-Factor App?
A.Development should use Windows and Production should use Linux
B.Development and Production environments should be as similar as possible
C.Production servers should be used for Development
D.Developers should have access to Production data
Correct Answer: Development and Production environments should be as similar as possible
Explanation:
Dev/prod parity minimizes the time and gaps between development and production, preventing 'it works on my machine' issues.
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29Which of the following is a key characteristic of Serverless architectures (FaaS)?
A.Long-running stateful processes
B.Stateless, ephemeral functions
C.Fixed monthly cost regardless of usage
D.Manual OS patching
Correct Answer: Stateless, ephemeral functions
Explanation:
Serverless functions are designed to be short-lived (ephemeral) and stateless, spun up to handle an event and then spun down.
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30What is the 'Port Binding' factor?
A.The app is completely self-contained and exports a service via port binding
B.Services should rely on a separate web server container (like Tomcat) injected at runtime
C.Hardcoding ports in the code
D.Using only port 80 for all services
Correct Answer: The app is completely self-contained and exports a service via port binding
Explanation:
The application should not rely on the runtime injection of a webserver; instead, it should bind to a port and listen for requests directly.
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31How do cloud-native applications typically handle 'Admin Processes'?
A.They are embedded in the main request loop
B.They are handled manually by editing the database
C.They run as one-off processes
D.They are strictly forbidden
Correct Answer: They run as one-off processes
Explanation:
Admin tasks (like database migrations) should run as one-off processes in an environment identical to the app's regular long-running processes.
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32In a Serverless environment, what usually triggers a function execution?
Serverless architectures are fundamentally event-driven; functions execute in response to specific triggers or events.
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33Which distributed data pattern manages transactions that span multiple microservices?
A.Single Transaction Script
B.Saga Pattern
C.Shared Database
D.Two-Phase Commit (2PC)
Correct Answer: Saga Pattern
Explanation:
The Saga pattern manages distributed transactions by executing a sequence of local transactions, with compensating transactions to undo changes if a step fails.
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34What challenge did Netflix face that led to the creation of Eureka?
A.They needed a new video compression algorithm
B.They needed to know the physical location of every server
C.They needed a way for services to locate each other dynamically in AWS
D.They ran out of hard drive space
Correct Answer: They needed a way for services to locate each other dynamically in AWS
Explanation:
Netflix created Eureka for Service Discovery to allow mid-tier load balancing and failover in the dynamic AWS cloud environment.
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35What is a 'Sidecar' pattern in cloud-native development?
A.A backup server
B.Deploying a helper process alongside the main application container
C.A method of pair programming
D.A secondary database
Correct Answer: Deploying a helper process alongside the main application container
Explanation:
The Sidecar pattern involves co-locating a helper container (for logging, proxying, or config) in the same pod/host as the main application container.
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36According to the 'Processes' factor of the 12-Factor App, applications should be:
A.Stateless and share-nothing
B.Stateful
C.Run as a single monolithic process
D.Dependent on sticky sessions
Correct Answer: Stateless and share-nothing
Explanation:
Applications should be stateless. Any data that needs to persist must be stored in a stateful backing service (like a database), not in the process memory.
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37Why is 'Concurrency' managed via the process model in 12-Factor Apps?
A.To save battery life
B.To prevent multiple users from logging in
C.To use threads exclusively
D.To scale out by adding more process instances rather than making one process larger
Correct Answer: To scale out by adding more process instances rather than making one process larger
Explanation:
The process model implies scaling horizontally (adding more processes) to handle increased load, which aligns with cloud-native scaling.
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38What is the primary role of an API Gateway in cloud-native architecture?
A.To generate frontend UI code
B.To act as a single entry point for clients, routing requests to appropriate microservices
C.To replace the database
D.To store the application data
Correct Answer: To act as a single entry point for clients, routing requests to appropriate microservices
Explanation:
An API Gateway aggregates backend services, handles routing, authentication, and rate limiting, presenting a unified interface to the client.
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39Which of the following describes 'Immutable Infrastructure'?
A.Servers are patched and updated in place
B.Hardware that is physically secured
C.Servers are never modified after deployment; they are replaced with new ones
D.Infrastructure that cannot be deleted
Correct Answer: Servers are never modified after deployment; they are replaced with new ones
Explanation:
Immutable infrastructure prevents configuration drift. Instead of updating a server, you build a new image and replace the old server.
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40In the context of Amazon's case study, what is the 'Service Interface' mandate?
A.Teams share database schemas directly
B.All data and functionality must be exposed through service interfaces (APIs)
C.Teams must communicate via email
D.Only C++ can be used
Correct Answer: All data and functionality must be exposed through service interfaces (APIs)
Explanation:
Jeff Bezos issued a mandate that all teams must expose their data and functionality through service interfaces, prohibiting direct linking or shared databases.
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41What is the 'Codebase' factor rule?
A.No revision control needed
B.One codebase tracked in revision control, many deploys
C.Multiple codebases for one app
D.Copy-pasting code between apps
Correct Answer: One codebase tracked in revision control, many deploys
Explanation:
A 12-factor app is always tracked in a version control system (like Git). There is a one-to-one correlation between the codebase and the app.
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42Which balancing algorithm sends requests sequentially to servers in a list?
A.IP Hash
B.Round Robin
C.Weighted Response Time
D.Least Connections
Correct Answer: Round Robin
Explanation:
Round Robin directs traffic to the first server, then the second, and so on, circling back to the beginning.
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43What is a disadvantage of Serverless architecture?
A.Vendor Lock-in
B.Paying for idle time
C.High maintenance of OS
D.Complexity of manual scaling
Correct Answer: Vendor Lock-in
Explanation:
Because serverless relies heavily on proprietary cloud provider features (AWS Lambda, Azure Functions), moving to another provider can be difficult.
CQRS separates the models for reading and writing data, allowing them to scale independently and be optimized separately.
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45How did Uber handle the transition from a monolithic architecture?
A.They outsourced development
B.They rewrote the whole app in one night
C.They stayed with the monolith
D.They broke the monolith into microservices based on business domains (e.g., passenger management, billing)
Correct Answer: They broke the monolith into microservices based on business domains (e.g., passenger management, billing)
Explanation:
Uber transitioned by decomposing their monolithic codebase into domain-driven microservices to handle their massive scale.
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46Which mechanism ensures a service instance is actually capable of handling requests before the Load Balancer sends traffic?
A.Health Checks
B.DNS lookup
C.Static routing
D.Random selection
Correct Answer: Health Checks
Explanation:
Load balancers perform health checks (pings) to ensure a backend server is up and running before routing traffic to it.
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47What does 'Elasticity' refer to in cloud computing?
A.The ability of the hardware to bend
B.The speed of the network cables
C.The ability to rapidly provision and de-provision resources based on demand
D.The long-term storage capacity
Correct Answer: The ability to rapidly provision and de-provision resources based on demand
Explanation:
Elasticity allows a system to grow and shrink resources automatically in real-time to match workload demand.
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48What is the relationship between Microservices and Containers?
A.Containers prevent microservices from communicating
B.Containers are a popular packaging technology for deploying microservices
C.They are the same thing
D.Microservices must run on bare metal, not containers
Correct Answer: Containers are a popular packaging technology for deploying microservices
Explanation:
While they are different concepts, containers (like Docker) provide the ideal isolation and portability required for deploying microservices.
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49A 'Circuit Breaker' enters the 'Open' state when:
A.A user logs in
B.The failure threshold is reached
C.The service is starting up
D.The service is healthy
Correct Answer: The failure threshold is reached
Explanation:
When failures exceed a certain threshold, the circuit breaker 'opens' to stop requests from reaching the failing service, allowing it time to recover.
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50Which of the following best describes the 'Simian Army' used by Netflix?
A.A team of security guards
B.A suite of automated tools to test system reliability by inducing failures
C.A customer support team
D.A video compression algorithm
Correct Answer: A suite of automated tools to test system reliability by inducing failures
Explanation:
The Simian Army (including Chaos Monkey) helps Netflix test their cloud infrastructure's reliability by intentionally causing various types of failures.
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