Question 1

What is high availability in the context of IT infrastructure, and what are the key components and strategies used to achieve it?

Accepted Answer

High availability refers to designing systems and infrastructure so that they remain operational and accessible with minimal downtime, even when individual components fail. The goal is to eliminate single points of failure so that no single hardware issue, software crash, or network disruption can take down a critical service. High availability is typically measured as a percentage of uptime over a given period. The industry standard targets are often expressed in "nines": 99.9 percent availability allows roughly 8.7 hours of downtime per year, 99.99 percent allows about 52 minutes, and 99.999

Question 2

Explain the differences between DAS, NAS, and SAN storage architectures. In what scenarios would you recommend each one?

Accepted Answer

Understanding storage architecture is essential for designing infrastructure that meets performance, capacity, and budget requirements. The three primary storage architectures, DAS, NAS, and SAN, each serve different use cases and come with distinct advantages and trade-offs.

DAS, or Direct Attached Storage, is storage that is physically connected to a single server, such as internal hard drives or an external drive array connected via SAS or USB. The storage is dedicated to that one server and is not shared across the network. DAS is the simplest and least expensive storage option. It offe

Question 3

Explain the differences between IaaS, PaaS, and SaaS cloud service models, and provide examples of when each would be appropriate for an enterprise environment.

Accepted Answer

The three cloud service models represent different levels of abstraction and management responsibility between the cloud provider and the customer. Understanding where each model fits is essential for making informed decisions about which services to use for different workloads.

Infrastructure as a Service, or IaaS, provides virtualized computing resources over the internet. The cloud provider manages the physical hardware, networking, and virtualization layer, while the customer manages everything above that: the operating system, middleware, runtime, applications, and data. Examples inclu

Question 4

What are the common cloud migration strategies, often referred to as the 6 Rs, and how do you determine which strategy is best for a given workload?

Accepted Answer

The 6 Rs framework, originally introduced by Gartner and popularized by AWS, provides a structured way to categorize the migration approach for each workload. Not every application should be migrated the same way, and choosing the right strategy for each workload is one of the most important decisions in a cloud migration project.

Rehost, commonly called lift-and-shift, means moving an application to the cloud with minimal or no changes. You take the existing server, convert it to a cloud virtual machine, and run it as-is. This is the fastest migration method and is appropriate for applicat

Question 5

What are the core principles of zero trust security architecture, and how does it differ from the traditional perimeter-based security model?

Accepted Answer

Zero trust is a security architecture philosophy built on the fundamental principle that no user, device, or network segment should be inherently trusted, regardless of whether it sits inside or outside the corporate network. This represents a significant departure from the traditional perimeter-based model that dominated enterprise security for decades, and understanding the distinction is essential for any senior IT support engineer tasked with protecting modern infrastructure.

The traditional perimeter-based security model operates on a castle-and-moat metaphor. The organization builds s

Question 6

Compare and contrast the major compliance frameworks HIPAA, PCI-DSS, SOC 2, and ISO 27001. What types of organizations does each apply to, and what are their primary areas of focus?

Accepted Answer

Compliance frameworks provide structured sets of requirements that organizations must meet to protect specific types of data or demonstrate adequate security controls. As a senior IT support engineer, you will frequently encounter multiple overlapping frameworks, and understanding what each one demands is critical for designing infrastructure and processes that satisfy all applicable requirements simultaneously.

HIPAA, the Health Insurance Portability and Accountability Act, is a United States federal law that applies to covered entities such as healthcare providers, health plans, and healt

Question 7

What are configuration management tools like Ansible, Puppet, and Chef, and how do they help senior IT support engineers maintain consistency across large server environments?

Accepted Answer

Configuration management tools are software platforms designed to automate the provisioning, configuration, and ongoing maintenance of servers and infrastructure at scale. For senior IT support engineers, these tools eliminate the manual, repetitive work of configuring servers individually and replace it with code-driven, repeatable processes that guarantee consistency across hundreds or thousands of machines.

The core problem that configuration management solves is configuration drift. In a manually managed environment, administrators make changes to servers over time, applying patches, tw

Question 8

What are CI/CD pipelines, and how can they be applied to infrastructure management and IT operations rather than just software development?

Accepted Answer

CI/CD stands for Continuous Integration and Continuous Delivery, or Continuous Deployment. While these practices originated in software development, they are increasingly essential for senior IT support engineers who manage infrastructure. Applying CI/CD principles to infrastructure operations brings the same benefits that software teams enjoy: faster delivery, fewer errors, consistent processes, and full auditability of every change.

Continuous Integration is the practice of frequently merging code changes into a shared repository, where automated tests validate each change. In the context

Question 9

Compare Agile and Waterfall project management methodologies in the context of IT infrastructure projects. When would you choose one over the other, and how do they affect team workflow and deliverables?

Accepted Answer

Understanding when to apply Agile versus Waterfall methodology is a foundational skill for any senior IT support engineer who leads projects. The choice between these two approaches directly impacts how your team plans work, responds to change, communicates progress, and ultimately delivers results. Neither methodology is universally superior; the right choice depends on the nature of the project, the stakeholders involved, and the level of certainty around requirements.

Waterfall is a sequential, linear methodology where each phase must be completed before the next one begins. The typical

Question 10

Describe the process you would follow to evaluate and select a new IT vendor for a critical service such as endpoint management or cloud backup. What criteria matter most, and how do you manage the vendor relationship after selection?

Accepted Answer

Vendor selection and management is a critical responsibility for senior IT support engineers because the tools and services you choose directly impact the team's ability to support the organization. A poor vendor choice can lead to unreliable service, excessive costs, difficult integrations, and painful migrations down the road. A structured evaluation process minimizes these risks and ensures the selected vendor genuinely fits the organization's needs.

The evaluation process should begin with a thorough requirements definition. Before looking at any vendor, document what you need the solut

IT Support

Topics

Infrastructure Architecture & Design

Cloud Services & Migration

Security Architecture & Compliance

Automation & DevOps Practices

Project Management & Leadership

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