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AWS Solutions Architect exam prep

TechTalk With Balu

AWS Solutions Architect Exam Prep is your deep-dive companion for mastering AWS architecture and passing the SAA certification with confidence.

Hosted by Balu, a Solutions Architect, this podcast goes beyond memorizing services. We break down core AWS concepts, real-world architecture patterns, cost optimization strategies, high availability design, security best practices, and exam-focused scenarios.

If you want to think like an architect — not just pass the exam — this is for you.

Perfect for:

AWS SAA-C03 candidates & Engineers transitioning into cloud

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  • 23 episodes
  • weekly
  • Avg 33 min
  • English

Episodes 23

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  • S1 · E14
    May 20 · 40 min

    Episode 12: AWS Lambda & Serverless Architecture - Functions, API Gateway & Step Functions | SAA-C03

    Complete serverless guide! Lambda, API Gateway, Step Functions, Cognito and 5 real architectures in 40 minutes. 🚀 SERVERLESS PARADIGM No servers to manage. You write code, AWS handles infrastructure. Automatic scaling, pay only for actual use. ⚡ LAMBDA FUNDAMENTALS CRITICAL LIMITS (exam tested): • Max execution: 15 MINUTES (900 seconds) - hard limit! • Memory: 128 MB - 10 GB (CPU scales with RAM) • Concurrency: 1,000 simultaneous executions default • Deployment: 50 MB compressed, 250 MB uncompressed • /tmp storage: Ephemeral, doesn't persist! PRICING: FREE tier 1M requests/month + 400K GB-seconds. Beyond: $0.20 per 1M requests. Example: 3M requests = $4.73/month vs $30-50 on EC2 (85% savings!) COLD vs WARM STARTS: First invocation slower (100ms-few seconds), subsequent fast (<10ms). Provisioned Concurrency eliminates cold starts. 🔗 LAMBDA INTEGRATIONS Triggers: API Gateway (REST APIs), S3 (file events), DynamoDB Streams (data changes), Kinesis (streaming), SNS/SQS (messaging), EventBridge (CRON jobs), ALB (HTTP), Cognito (auth). Execution modes: Synchronous (caller waits), Asynchronous (fire-and-forget), Event source mapping (Lambda polls). 🌐 API GATEWAY Create REST APIs backed by Lambda. Features: API versioning, multiple environments, authentication (IAM/Cognito/custom), throttling, caching, transformations. Integrations: Lambda (most common), HTTP proxy (add auth/throttling), AWS services (direct Kinesis/SQS). Endpoints: Edge-Optimized (CloudFront global), Regional (same region), Private (VPC only). CRITICAL: 29-second timeout! Lambda runs 15 min but API Gateway times out at 29 sec. 🔄 STEP FUNCTIONS Orchestrate multiple Lambdas into workflows. Visual state machines with sequence, parallel, choice, wait states, error handling with automatic retries. Standard workflows (up to 1 year, exactly-once). Express workflows (5 min, at-least-once, cheaper). Use cases: Order fulfillment, ETL pipelines, human approval, multi-step business logic. 👤 COGNITO User Pools: Serverless user database. Sign-up/in, password reset, MFA, social login (Facebook/Google/SAML). Integrates with API Gateway/ALB for JWT validation. Identity Pools: Temporary AWS credentials for direct S3/DynamoDB access from mobile/web apps. EXAM KEY: Cognito for mobile/web users. IAM for services. Keywords "mobile users" "Facebook login" = Cognito! 🏗️ 5 REAL ARCHITECTURES 1. REST API: API Gateway + Lambda + DynamoDB + Cognito 2. Thumbnail Service: S3 → Lambda → S3 + DynamoDB (thousands/sec) 3. CRON Jobs: EventBridge → Lambda → SNS ($0.50/month vs $30 EC2) 4. Data Pipeline: Kinesis → Lambda → Firehose → S3 (millions/day) 5. Mobile Backend: Cognito + API Gateway + Lambda + S3 + DynamoDB ⚠️ 12 CRITICAL EXAM TRAPS 1. Lambda max 15 MIN (longer = EC2/Batch/ECS) 2. Cold starts exist (Provisioned Concurrency eliminates) 3. Concurrency 1,000 default (request increases) 4. Lambda in VPC slower cold starts 5. API Gateway 29-SEC timeout (async for longer) 6. /tmp EPHEMERAL (S3/EFS for persistence) 7. Deployment 250 MB limit (use Layers) 8. DynamoDB Streams prerequisite for Global Tables 9. Cognito for users, IAM for services 10. Step Functions for orchestration (not manual chaining) 11. ALB can invoke Lambda (target group) 12. Environment variables 4 KB (Parameter Store for more) ⏱️ TIMESTAMPS 00:00 Introduction | 01:00 Serverless Paradigm | 03:00 Lambda Fundamentals | 08:00 Lambda Triggers | 12:00 API Gateway | 16:00 Step Functions | 19:00 Cognito | 22:00 5 Architectures | 29:00 12 Exam Traps | 36:00 Tips | 38:30 Conclusion Perfect for SAA-C03 exam and understanding event-driven serverless! #AWS #Lambda #Serverless #APIGateway #StepFunctions #Cognito #SAAC03 ⭐ 5-star rating if this helps! 🔗 docs.aws.amazon.com/lambda

  • S1 · E13
    May 17 · 38 min

    Episode 11: VPC Architecture Deep Dive - Subnets, NAT Gateway & Security Groups vs NACLs | SAA-C03

    Complete VPC guide! Subnets, routing, NAT Gateway & Security Groups vs NACLs explained in under 40 mins. 🏗️ VPC FUNDAMENTALSCIDR: 10.0.0.0/16 = 65,536 IPs. Cannot change after creation!AWS RESERVES 5 IPs: .0 (network), .1 (router), .2 (DNS), .3 (reserved), .255 (broadcast)Example: /24 = 256 addresses, only 251 usable 📊 SUBNETSONE SUBNET = ONE AZ!PUBLIC: Route to IGW (web servers, load balancers)PRIVATE: No IGW route (databases, app servers) 🌍 INTERNET GATEWAYBidirectional access. One per VPC. FREE. Need: route + public IP + SG + NACL. 🔄 NAT GATEWAYOutbound-only for private instances. In PUBLIC subnet. One per AZ. Cost: $0.045/hr + $0.045/GB. 🛣️ ROUTE TABLESPUBLIC: 0.0.0.0/0 → IGWPRIVATE: 0.0.0.0/0 → NAT 🔒 SECURITY GROUPS vs NACLs (CRITICAL!)SECURITY GROUPS: STATEFUL, instance-level, ALLOW onlyNACLs: STATELESS, subnet-level, ALLOW/DENY Stateful = return traffic auto-allowedStateless = must allow both directions! 🔗 VPC PEERINGConnect VPCs. NOT TRANSITIVE! A↔B↔C ≠ A↔C 🔌 ENDPOINTSGateway (S3/DynamoDB): FREEInterface (other services): Paid ⚠️ 12 TRAPS SG stateful vs NACL stateless Peering not transitive Subnets = one AZ NAT in public subnet 5 IPs reservedAnd 7 more! ⏱️ TIMESTAMPS00:00 Introduction | 01:00 VPC Fundamentals | 04:00 Subnets | 08:00 IGW | 10:00 NAT | 13:00 Routes | 16:00 SG vs NACL | 22:00 Peering | 25:00 Endpoints | 31:00 Traps #AWS #VPC #SecurityGroups #NACL #SAAC03 #Networking Tags: AWS, VPC, Networking, Security Groups, NACL, NAT Gateway, Subnets, Solutions Architect, SAA-C03, Cloud Networking, Route Tables, VPC Peering, Stateful, Stateless, AWS Exam, Tech Podcast

  • S1 · E12
    May 10 · 21 min

    Episode 10.5: Exam Q&A - 35 Rapid-Fire Questions: ASG, S3, Storage, Databases & Route 53 | SAA-C03

    Test your knowledge! 35 rapid-fire questions covering Episodes 6-10: Auto Scaling Groups, S3, Storage Architectures, Databases & Route 53. ⚡ HOW THIS WORKS ACTIVE RECALL FORMAT: - I ask a question - 5-second pause for you to think - I give the answer + explanation - Track your score (1 point per correct answer) This is ACTIVE RECALL - the most effective study method. Testing yourself is 2-3x more effective than passive review! 📋 QUESTION BREAKDOWN AUTO SCALING GROUPS (7 Questions): - ASG capacity constraints (min/desired/max) - Scaling policies (Target Tracking vs Scheduled) - EC2 vs ELB health checks - Lifecycle hooks - Termination policies - Predictable vs unpredictable scaling Sample: "ASG has min 2, desired 6, max 10. You terminate 3 instances. What happens?" AMAZON S3 (7 Questions): - Storage classes & costs (Glacier Deep Archive $1/TB!) - Minimum storage durations (Standard-IA 30 days) - Versioning (only new objects after enabling) - Cross-Region Replication (existing objects don't replicate) - Bucket name uniqueness - Lifecycle transitions (one-way only!) - Multi-part upload requirements Sample: "Delete Standard-IA object after 15 days. What charges?" STORAGE ARCHITECTURES (7 Questions): - EBS AZ-locked (snapshot to move) - EFS vs EBS (multiple instances = EFS) - Boot volume restrictions (HDD cannot boot) - EFS Linux-only trap (Windows = FSx) - S3 not mountable as file system - EBS Multi-Attach limits (16 instances, same AZ, io2 only) - Cost optimization (One Zone-IA 90% savings) Sample: "10 servers sharing files. EBS or EFS?" AWS DATABASES (9 Questions): - Multi-AZ vs Read Replicas (THE critical distinction!) - Async replication = eventual consistency - Aurora vs RDS failover times (30s vs 60-120s) - Aurora storage auto-scaling (never runs out) - Encryption trap (can't enable on existing) - Redis vs Memcached (HA needs Redis) - ElastiCache load reduction (80%+) - Stopped RDS charges (storage continues) - Aurora Global replication lag (<1 second) Sample: "High read load. Enable Multi-AZ?" (NO - use Read Replicas!) AMAZON ROUTE 53 (5 Questions): - CNAME vs Alias for zone apex (THE trap!) - Latency routing for performance - Failover routing health checks (mandatory!) - Geolocation default record requirement - Health checks for private resources (CloudWatch alarms) Sample: "Point example.com to load balancer. CNAME or Alias?" 🎯 SCORING GUIDE 30-35 correct: EXAM READY! ⭐⭐⭐⭐⭐ Strong mastery. Keep doing practice questions. 25-29 correct: VERY GOOD! ⭐⭐⭐⭐ On the right track. Review missed questions. 20-24 correct: GOOD FOUNDATION ⭐⭐⭐ Solid base but needs more study. Focus on weak areas. 15-19 correct: GAPS TO FILL ⭐⭐ Watch episodes again, take notes, re-quiz. Below 15: NEEDS REVIEW ⭐ Don't worry! Material is complex. Rewatch Episodes 5.5-9. 💡 WHY ACTIVE RECALL WORKS Research shows: - Testing yourself = 2-3x better retention than re-reading - Active recall strengthens memory connections - Immediate feedback corrects misconceptions - Spaced repetition with re-testing = long-term memory HOW TO USE THIS EPISODE: 1. First attempt: Track your score 2. Review episodes for missed questions 3. Re-take quiz after 3 days 4. Re-take again before exam 5. Aim for 30+ correct on every attempt 📚 EPISODES COVERED: Episode 6: Auto Scaling Groups Episode 7: Amazon S3 Deep Dive Episode 8: Storage Architectures (EBS vs EFS vs S3) Episode 9: AWS Databases (RDS, Aurora, ElastiCache) Episode 10: Amazon Route 53 (DNS & Traffic Routing) Pro tip: Retake this quiz multiple times until you score 30+ consistently. That's exam-ready mastery! #AWS #ExamPrep #SAAC03 #SolutionsArchitect #QuizTime #ActiveRecall #StudyTips #AutoScaling #S3 #Storage #Databases #Route53 #InteractiveLearning ⭐ Leave a 5-star rating if this quiz helps you identify gaps! 📱 Share your score in the comments - what did you get out of 35?

Showing 21–23 of 23 episodes