Question 1

What are the three main cloud service models (IaaS, PaaS, SaaS), and can you give one example of each from any major cloud provider?

Accepted Answer

The three main cloud service models represent different levels of abstraction and management responsibility between the cloud provider and the customer. Understanding these models is essential for choosing the right service for any given workload.

Infrastructure as a Service, or IaaS, provides the most fundamental cloud resources. The provider manages the physical hardware, networking, and virtualization layers, while you are responsible for the operating system, middleware, runtime, and applications. Think of it as renting a virtual machine where you have full control over what runs on it.

Question 2

What are cloud regions and availability zones, and why do they matter when deploying applications?

Accepted Answer

Regions and availability zones are the building blocks of cloud infrastructure geography, and understanding them is critical for designing reliable and performant applications.

A region is a geographic area where a cloud provider operates data centers. AWS has regions like us-east-1 in Northern Virginia and eu-west-1 in Ireland. Azure uses names like East US and West Europe. GCP uses us-central1 and europe-west1. Each region is completely independent, meaning a failure in one region does not affect another. Regions matter because they determine the physical location of your data and compute

Question 3

Explain how to set up secure connectivity between an on-premises data center and a cloud VPC. Compare VPN and dedicated connection options, and describe the architecture for a hybrid cloud network.

Accepted Answer

Hybrid cloud networking connects your on-premises data center to your cloud environment, enabling resources in both locations to communicate securely. This is essential for organizations that cannot migrate everything to the cloud at once or have regulatory requirements to keep certain data on-premises.

The most common approach for initial hybrid connectivity is a site-to-site VPN. In AWS, you create a Virtual Private Gateway and attach it to your VPC, then configure a Customer Gateway representing your on-premises VPN device. AWS establishes two IPsec tunnels for redundancy. The VPN encryp

Question 4

Explain CIDR notation and how IP address planning works when designing a cloud network. How would you plan the IP address space for a multi-environment deployment?

Accepted Answer

CIDR, which stands for Classless Inter-Domain Routing, is the standard notation for specifying IP address ranges in cloud networking. Understanding CIDR is essential for planning VPC networks, subnets, and ensuring connectivity between environments.

CIDR notation combines an IP address with a prefix length separated by a slash. For example, 10.0.0.0/16 means the first 16 bits of the address are fixed as the network portion, and the remaining 16 bits are available for host addresses. This gives you 65,536 possible addresses. A /24 block like 10.0.1.0/24 provides 256 addresses. A /28 provides

Question 5

What is a managed relational database service, and what are the main options available across AWS, Azure, and GCP?

Accepted Answer

A managed relational database service handles the operational tasks of running a database engine so you can focus on your application and data rather than infrastructure management. The cloud provider takes care of provisioning, patching, backups, replication, failover, and scaling, while you manage the database schema, queries, and data.

AWS offers Amazon RDS, which supports six database engines: MySQL, PostgreSQL, MariaDB, Oracle, Microsoft SQL Server, and Amazon Aurora. Aurora is AWS's own cloud-native database that is compatible with MySQL and PostgreSQL but offers up to five times bett

Question 6

What is object storage, and how does it differ from block storage and file storage in cloud environments?

Accepted Answer

Cloud providers offer three fundamental types of storage, each designed for different use cases. Understanding the differences helps you choose the right storage solution for your application.

Object storage stores data as discrete objects, each consisting of the data itself, metadata describing the object, and a unique identifier or key. Objects are stored in flat namespaces called buckets rather than in a hierarchical directory structure. You access objects through HTTP APIs using their keys. AWS S3, Azure Blob Storage, and Google Cloud Storage are the primary object storage services. Obj

Question 7

What is Identity and Access Management (IAM) in cloud computing, and why is it important?

Accepted Answer

Identity and Access Management, commonly known as IAM, is the framework that controls who can access what resources in your cloud environment. It is the cornerstone of cloud security and one of the first things you configure when setting up any cloud account.

IAM answers two fundamental questions. Authentication asks "who are you?" and verifies that a user or service is who they claim to be, typically through credentials like passwords, access keys, or multi-factor authentication tokens. Authorization asks "what are you allowed to do?" and determines which actions the authenticated entity c

Question 8

What is an IAM policy, and can you explain the basic structure of a policy document in AWS?

Accepted Answer

An IAM policy is a JSON document that defines permissions by specifying what actions are allowed or denied on which resources. Policies are the mechanism through which you grant and restrict access in AWS and similar cloud platforms.

The basic structure of an AWS IAM policy document contains several key elements. The Version field specifies the policy language version, which should always be set to 2012-10-17, the current version. The Statement field contains one or more individual permission statements, each of which includes the following components.

Effect is either Allow or Deny, ind

Question 9

What does "serverless" mean in cloud computing, and how does it differ from traditional server-based deployments?

Accepted Answer

Serverless computing is a cloud execution model where the cloud provider manages the infrastructure entirely, automatically provisioning and scaling resources based on demand. Despite the name, servers are still involved, but you as the developer never manage, provision, or even see them. You focus exclusively on writing and deploying code.

In a traditional server-based deployment, you provision virtual machines, configure the operating system, install runtime environments, deploy your application, and manage scaling, patching, and availability. If traffic spikes, you need to either manuall

Question 10

What is Amazon EC2, and what are the key concepts you need to understand to launch and manage an EC2 instance?

Accepted Answer

Amazon Elastic Compute Cloud, or EC2, is the foundational compute service in AWS that provides resizable virtual machines, called instances, in the cloud. EC2 gives you full control over the operating system, installed software, and configuration, making it the most flexible compute option available.

To launch an EC2 instance, you need to understand several key concepts. First is the Amazon Machine Image, or AMI, which is a template containing the operating system and pre-installed software. AWS provides official AMIs for Amazon Linux, Ubuntu, Windows Server, and other operating systems. Yo

Cloud Engineer

Topics

AWS, Azure & GCP Fundamentals

Cloud Networking

Cloud Storage & Databases

IAM & Security Basics

Serverless & Compute

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