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Virtualization (1367 questions)

vSphere 8 (132)Migration & HA (114)Hyper-V 2025 (111)Storage (108)Proxmox VE (108)KVM & libvirt (99)Networking (87)vSAN & HCI (87)KubeVirt & K8s Virt (84)CPU & Memory (69)Hypervisor Concepts (66)Cloud Virtualization (60)Citrix/XCP-ng (54)Nutanix AHV (53)Licensing & Trends (51)Containers vs VMs (48)Memory (12)Hyper-V (12)KVM (12)

Big Data (1314 questions)

Spark Tuning (117)Kafka (108)Iceberg (96)Delta Lake (87)Cloud Platforms (87)Spark SQL & Catalyst (81)Spark Core (75)Flink & Streaming (69)Hive (63)File Formats (63)Databricks (63)HDFS (60)Lakehouse & Architecture (60)HBase & NoSQL (48)YARN & MapReduce (45)Spark 4 & Connect (42)Kafka 4 / KRaft (42)Hudi & Open Tables (27)Spark SQL (15)Formats (15)Cloud (15)YARN (12)Streaming (12)Lakehouse (12)

Security (1098 questions)

Threats & Attacks (87)Crypto · Fundamentals (84)Network Security (78)Crypto · TLS & PKI (72)OAuth & OIDC & JWT (69)AppSec · OWASP Top 10 (63)Malware & Forensics (54)Secrets Management (51)Secure Coding (48)AuthN & AuthZ (45)Vulnerability Mgmt (CVE/CVSS) (45)IAM & Access Control (45)Incident Response (45)Cloud Security (45)Tools · Pentest (45)Web Security Headers (42)Container & K8s Security (36)API Security (36)Compliance & Frameworks (NIST/ISO/SOC2) (36)Logging & SIEM (36)Identity Federation (SAML) (36)

Networking (1047 questions)

Tools · Diagnostics (84)Ports & Protocols (81)IP Addressing & Subnetting (72)Routing (BGP/OSPF/static) (66)HTTP/HTTPS & TLS (66)Switching & VLANs (60)OSI & TCP/IP Model (57)DNS (57)Cisco IOS (57)TCP/IP · Transport (54)DHCP (54)NAT & PAT (54)Load Balancing (54)Firewalls & Security (54)Wireless (54)SDN & Overlay Networks (27)IPv6 (24)VPN & Tunneling (24)QoS & Traffic Shaping (24)Network Monitoring (SNMP/NetFlow) (24)

Data Engineering (1278 questions)

Warehousing (78)SQL Analytics (78)Advanced SQL (78)Airflow 3 (78)Snowflake (75)Data Quality (72)Streaming (72)BigQuery (72)Ingestion & CDC (69)dbt Advanced (63)Cost & Performance (60)Orchestration (54)dbt (51)Data Modeling (51)Cloud Stack (48)Lineage & Governance (45)Iceberg & Open Tables (42)ETL & ELT (39)Modeling (36)File Formats (36)SCD & History (33)SQL (24)ETL/ELT (24)

System Administration (1131 questions)

Windows · Active Directory (78)Linux · Networking (75)Linux · Storage & LVM (72)Linux · Processes & Perf (72)Linux · SSH & Security (66)Windows · PowerShell (63)Linux · systemd & Boot (60)Linux · Permissions (57)Linux · Shell (54)Networking · Ports (54)Windows · DNS & DHCP (48)Cloud & Containers (42)Linux · Logging (39)Monitoring & Automation (39)Windows · Group Policy (36)Windows · Hyper-V (36)Windows · Event Logs (36)Linux · Packages (33)Windows · Services & Boot (33)Windows · Patching & Backup (33)Linux · Scheduling (30)Windows · NTFS & Shares (27)Windows · Networking (27)Linux · Users & Groups (21)

Cloud (1095 questions)

AWS · Networking (VPC) (75)AWS · Compute (72)AWS · Storage (72)AWS · IAM & Security (72)AWS · Databases (72)AWS · Serverless (72)GCP · Core (72)GCP · Data & ML (72)Cloud · Containers (EKS/GKE/AKS) (72)Azure · Core (42)Azure · Identity (42)Cloud · Networking & CDN (42)Cloud · Cost & Billing (42)Cloud · Well-Architected/Reliability (42)Cloud · IaC & Automation (42)AWS · Monitoring & Ops (30)GCP · Networking (30)Azure · Storage (30)Azure · Data & Integration (30)Cloud · Messaging & Events (24)Cloud · Migration & DR (24)Cloud · Observability (24)

DevOps & SRE (1137 questions)

IaC · Terraform (69)Containers · Docker (66)Linux & Shell (66)Kubernetes · Core (63)CI/CD · GitHub Actions (60)CI/CD · Jenkins (60)CI/CD · GitLab (60)Observability · Prometheus/Grafana (60)Kubernetes · Workloads (57)Config · Ansible (57)Artifacts & Registries (57)Cloud · AWS (57)Kubernetes · Networking (54)Kubernetes · Storage (54)GitOps · ArgoCD/Flux (54)Secrets & Config (54)Networking & TLS (54)Kubernetes · Config & Helm (51)Containers · Compose (42)Release Strategies (42)

Computer Science Fundamentals (1209 questions)

OS · CPU Scheduling (57)DBMS · SQL (54)Arch · CPU & Memory (54)OS · Processes & Threads (48)OS · Synchronization (48)OOP · Advanced & Patterns (48)OS · Deadlock (45)DBMS · Transactions & Concurrency (45)DBMS · Architecture & Theory (45)CN · OSI & TCP-IP (45)CN · Transport Layer (45)TOC · Automata & Languages (45)OS · Memory Management (42)DBMS · Relational Model (42)CN · Network Layer & IP (42)CN · Routing & Devices (42)CN · Application Layer (42)Compilers · Phases (42)OS · File Systems & Disk (39)DBMS · Normalization (39)DBMS · Indexing & Storage (39)DBMS · ER Model (39)OOP · Inheritance & Polymorphism (39)OOP · Abstraction Mechanisms (39)OS · Page Replacement (36)OS · Concepts (36)CN · Data Link & Errors (36)OOP · Principles (36)

MLOps & Integration (525 questions)

Linux & Bash (42)Kubernetes · Core Objects (36)AWS for ML (33)Observability (33)OpenShift (30)GenAI Ops · RAG & Prompting (30)Containers · Docker (27)CI/CD & GitOps (27)Model Serving & Inference (27)Logging & Monitoring (27)MLOps Lifecycle (27)AI Security & Compliance (24)Kubernetes · kubectl (21)Python Automation (21)Workflow Orchestration (21)ML Monitoring (21)API & Microservices (21)Agentic AI (21)Containers · Docker CLI (18)OpenShift · oc CLI (18)

Design Patterns (138 questions)

Behavioral (30)Structural (21)Design Principles (21)Creational (18)SOLID Principles (18)Pattern Selection (15)Anti-patterns (15)

Spring (201 questions)

Beans & DI (30)Web MVC (27)Core & IoC Container (21)Spring Boot (21)Data & JPA (21)AOP (18)Security (18)Configuration & Profiles (15)Exception Handling & Validation (15)Testing (15)

Aptitude (676 questions)

Percentages (30)Simple Interest (30)Ratio & Proportion (30)Averages (30)Trains crossing a platform (30)Boats & Streams (30)Problems on Ages (30)LCM & HCF (30)Probability (30)Mensuration (30)Simplification (BODMAS) (30)Coding–Decoding (30)Clocks (angle) (30)Calendars (day of week) (30)Data Interpretation (30)Partnership (29)Mixtures & Alligation (28)Profit & Loss (27)Time & Work (23)Time, Speed & Distance (21)Pipes & Cisterns (20)Number Series (20)Compound Interest (19)Problems on Trains (18)Permutations & Combinations (10)Blood Relations (6)Direction Sense (5)

GraphQL (189 questions)

Schema & Types (27)Queries (27)Mutations & Subscriptions (18)Resolvers (18)Performance (N+1 & DataLoader) (18)Errors & Nullability (18)Tooling & Federation (18)Schema Definition Language (15)Pagination (Relay connections) (15)GraphQL vs REST (15)

SQL (423 questions)

Schema & DDL (27)Data Types (27)Indexing Internals (27)Query Plans (27)NULL Handling (24)Concurrency Control (24)Normalization (24)Advanced Querying (21)Isolation Levels (21)Advanced Analytics (21)Querying Basics (18)Joins (18)Aggregation & Grouping (18)Subqueries & CTEs (18)Window Functions (18)Indexes & Transactions (18)Set Operations (18)Data Modification (18)Views & Programmability (18)Join Algorithms (18)

C# (216 questions)

Core Language & Types (24)OOP (24)Generics & Collections (24)LINQ (24)Delegates & Events (21)Async & Concurrency (21)Modern C# (21)Equality & Strings (21)Memory & GC (18)Exceptions (18)

CSS (180 questions)

Flexbox (24)Box Model & Layout (21)Grid (21)Selectors & Specificity (21)Modern CSS (21)Positioning (18)Units & Values (18)Responsive & Media Queries (18)Transitions & Animations (18)

FastAPI (180 questions)

Pydantic & Validation (24)Routing & Path Operations (21)Request Data (21)Dependency Injection (18)Responses (18)Async & Performance (18)Auth & Security (15)Errors & Middleware (15)Docs & OpenAPI (15)App Structure & Lifecycle (15)

HTML (192 questions)

Text & Content (24)Forms & Inputs (24)Semantic & Sectioning (24)Document Structure (21)Media & Graphics (21)Tables & Lists (21)Attributes & Global (21)Accessibility (ARIA) (18)Metadata & SEO (18)

Java (207 questions)

OOP & Classes (24)Core Language (21)Collections Framework (21)Functional (21)Modern Java (21)Concurrency & Threads (18)Memory & JVM (18)Strings & Equality (18)Modifiers (15)Generics (15)Exceptions (15)

PHP (171 questions)

Core Language & Types (24)Arrays (21)Strings & Functions (21)OOP (21)Modern PHP 8 (18)Superglobals & Web (18)Closures & Generators (18)Error Handling (15)Namespaces & Autoloading (15)

REST API (135 questions)

Status Codes (24)HTTP Methods (15)REST Principles (12)Resource Design & URLs (12)Idempotency & Safety (12)Versioning (12)Auth (12)Pagination & Filtering (12)Caching & Headers (12)Errors & Content Negotiation (12)

Blazor (150 questions)

Hosting Models (21)Lifecycle (18)Components (15)Data Binding (15)Routing (15)State & DI (15)Forms & Validation (15)Razor Syntax (12)JS Interop (12)Rendering (12)

.NET (177 questions)

Runtime & CLR (21)Memory & GC (21)Assemblies & Deployment (21)Platform Evolution (18)Base Class Library (18)Async & Threading (18)Build & Tooling (15)Configuration & Hosting (15)Interop (15)Versioning & Compatibility (15)

EF Core (168 questions)

DbContext & Sets (21)Modeling (21)Change Tracking (21)Relationships (18)Querying (18)Loading Strategies (18)Migrations (15)Performance (12)Concurrency (12)Transactions & Providers (12)

Firebase (147 questions)

Firestore (21)Authentication (18)Realtime Database (15)Security Rules (15)Cloud Functions (15)Storage (15)Hosting (12)Messaging & Analytics (12)Data Modeling (12)Pricing & Limits (12)

Flutter (150 questions)

Layout (21)Widgets (18)State Management (18)Dart Language (18)Rendering and Trees (15)Navigation (12)Lifecycle (12)Async and Streams (12)Styling and Material (12)Performance (12)

Git (144 questions)

Remote & Collaboration (21)Core Concepts (18)Merging vs Rebasing (18)Undoing Changes (18)Branching (15)History & Inspection (15)Advanced (15)Stashing & Tags (12)Internals (12)

Redis (159 questions)

Data Structures (21)Expiration & Eviction (18)Persistence (15)Caching Patterns (15)Pub/Sub & Streams (15)Transactions & Scripting (15)Replication & HA (15)Clustering (15)Performance (15)Use Cases (15)

Bash (159 questions)

Variables & Expansion (18)Conditionals & Tests (18)I/O & Redirection (18)Special Variables (18)Loops (15)Functions & Args (15)Globbing & Patterns (15)Arrays (15)Robustness (15)Process & Job Control (12)

Caching (150 questions)

Caching Patterns (18)HTTP Caching (18)Eviction Policies (15)Cache Problems (15)Invalidation (15)Consistency (15)Cache Layers (15)Distributed Caching (15)Metrics (12)Trade-offs (12)

Concurrency (150 questions)

Fundamentals (18)Synchronization (18)Hazards (18)Coordination (15)Atomicity & Memory (15)Async (15)Lock-Free (15)Models (12)Thread Pools (12)Patterns (12)

.NET MAUI (153 questions)

Fundamentals (18)Controls & Layouts (18)Data Binding & MVVM (18)XAML (15)Navigation (15)Handlers (15)Dependency Injection (15)Platform Integration (15)Lifecycle (12)Resources & Styling (12)

Functional Programming (150 questions)

Core Principles (18)Functions (18)Composition (15)Recursion (15)Data Transformation (15)Laziness (15)Handling Effects (15)Type Concepts (15)Immutability (12)State (12)

JavaScript (108 questions)

Types & Coercion (18)Scope & Closures (18)this & Functions (18)Async & Event Loop (18)Prototypes & Objects (18)ES6+ Features (18)

Kotlin (147 questions)

Null Safety (18)Variables & Types (18)Functional (18)Functions (15)Classes & OOP (15)Coroutines (15)Properties & Delegation (12)Collections (12)Control Flow (12)Interop & Idioms (12)

Message Queues (153 questions)

Core Concepts (18)Kafka (18)RabbitMQ (18)Messaging Models (15)Delivery Guarantees (15)Ordering (15)Reliability (15)Cloud Queues (15)Backpressure & Scaling (12)Patterns (12)

Node.js (90 questions)

Runtime & Event Loop (18)Modules (18)Core APIs (18)HTTP & Express (18)Async Patterns (18)

NoSQL (159 questions)

NoSQL Types (18)Data Modeling (18)CAP & Consistency (18)MongoDB (18)Partitioning & Scale (15)Replication (15)Cassandra (15)DynamoDB (15)Querying (15)When to Use (12)

Power BI (165 questions)

Components & Architecture (18)Power Query (18)Data Modeling (18)DAX Basics (18)DAX Functions (18)Data Connectivity (15)Visualizations (15)Filters & Interactivity (15)Sharing & Deployment (15)Performance (15)

React (90 questions)

Components & JSX (18)State & Effect Hooks (18)Memo, Ref & Context Hooks (18)Rendering & Performance (18)State & Data Flow (18)

Rust (165 questions)

Ownership & Borrowing (18)Traits (18)Error Handling (18)Collections & Iterators (18)Generics & Closures (18)Lifetimes (15)Types & Structs (15)Smart Pointers (15)Pattern Matching (15)Concurrency (15)

Testing (129 questions)

Test Levels (18)Test Doubles (15)Methodologies (12)Coverage (12)Test Quality (12)Assertions & Fixtures (12)Types of Testing (12)Non-Functional (12)Practices (12)Pitfalls (12)

TypeScript (90 questions)

Basic Types (18)Interfaces & Types (18)Generics (18)Narrowing & Guards (18)Utility & Composite Types (18)

ASP.NET Core (150 questions)

Middleware & Pipeline (15)Dependency Injection (15)Routing (15)Controllers & Minimal APIs (15)Model Binding & Validation (15)Configuration & Options (15)Hosting & Startup (15)Filters (15)Auth (15)Logging & Errors (15)

C++ (150 questions)

Core Language (15)Memory and RAII (15)OOP and Classes (15)Templates and Generics (15)STL Containers (15)STL Algorithms and Iterators (15)Move Semantics (15)Concurrency (15)Modern C++ (15)Undefined Behavior and Pitfalls (15)

Go (150 questions)

Core Language (15)Types & Structs (15)Interfaces (15)Goroutines & Concurrency (15)Channels (15)Error Handling (15)Memory & Performance (15)Generics (15)Standard Library & Idioms (15)Packages & Tooling (15)

Python (147 questions)

Data Types & Structures (15)Functions & Scope (15)Comprehensions & Iterators (15)Decorators & Closures (15)Generators & Async (15)Memory & Mutability (15)Exceptions (15)Modules & Packaging (15)Standard Library & Idioms (15)OOP & Dunder Methods (12)

React Native (150 questions)

Core Components (15)Styling & Layout (15)Navigation (15)State & Hooks (15)Native Modules & Bridge (15)New Architecture (15)Platform APIs (15)Performance (15)Lists & Touch (15)Build & Tooling (15)

Swift (150 questions)

Optionals (15)Value vs Reference Types (15)Memory Management (15)Protocols and Generics (15)Closures (15)Enums and Pattern Matching (15)Error Handling (15)Concurrency (15)Properties (15)SwiftUI vs UIKit (15)