Скачать или смотреть AWS VPC Routing Tables Explained: Mistake 50% of Solution Architect Associate Candidates Make

Master AWS VPC routing tables and avoid the configuration mistakes that fail 50% of SAA-C03 exam candidates!

This complete guide explains NAT Gateway placement, VPC peering routes, route priority, and the Transit Gateway trap with real production disaster stories.
🎯 What You'll Learn:
The 7 deadly VPC routing table mistakes that cause exam failures
Why NAT Gateway placement in the wrong subnet breaks everything
How to configure public vs private subnets correctly (it's not what you think!)
VPC peering bidirectional routing requirements
Route priority and longest prefix match explained with examples
Transit Gateway vs VPN Gateway routing differences
Real production outage: How Slack's Transit Gateway misconfiguration caused a major incident
Exam question patterns and strategies for VPC routing scenarios
⏱️ Timestamps:
0:00 - Introduction: The VPC Routing Nightmare
0:45 - Why 50% Fail VPC Routing Questions on SAA-C03
1:30 - What Are Route Tables? (Core Concepts)
2:00 - Public vs Private Subnets: The Route Table Definition
3:30 - Mistake #1: NAT Gateway in Wrong Subnet
5:00 - Mistake #2: VPC Peering Requires Bidirectional Routes
6:30 - Production Disaster: Slack's Transit Gateway Failure
7:30 - Route Priority: Longest Prefix Match Explained
9:00 - Practice Question: Test Your Knowledge
10:30 - The 7 Deadly Mistakes Recap
🔥 Why VPC Routing Is Critical for SAA-C03:
Appears in 8-12 questions per exam
Part of Design Secure Architectures domain - 26% of total exam score
Consistently cited as #1 candidate pain point
Tests architectural thinking, not just service knowledge
Hands-on understanding required - memorization won't work
💡 The 7 Deadly VPC Routing Mistakes:
Trying to delete the local route (it's immutable!)
Creating NAT Gateway in private subnet instead of public
Thinking one subnet can have multiple route tables
Creating route table but forgetting to associate with subnet
Treating "public/private" as subnet attribute vs routing characteristic
Configuring VPC peering routes in only one VPC (need both!)
Not understanding longest prefix match for route priority
🚨 Production Disaster Stories:
Slack (January 2021): Transit Gateway scaling failure caused major outage. Their monitoring systems were in separate VPC dependent on failing TGW - couldn't even alert on the problem!
AssemblyAI (August 2021): Network Load Balancer routing issues caused 5xx errors when containers flapped between healthy/unhealthy states
Learn from real-world mistakes that cost companies millions
📊 Route Priority Explained: AWS uses longest prefix match - the most specific route wins:
/32 = single IP (highest priority)
/24 = 256 IPs
/16 = 65,536 IPs
/0 = all IPs (default route, lowest priority)
Example: Traffic to 10.0.1.50 matches both 10.0.1.0/24 and 10.0.0.0/16, but /24 is more specific so it wins! 🎓
Practice More Questions:
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Step-by-step VPC routing walkthroughs for every question type
Detailed explanations showing exactly WHY answers are correct
Performance tracking by domain to identify weak areas
Practice questions covering all 7 routing mistakes
📚 Related AWS SAA-C03 Topics:
DynamoDB WCU/RCU calculations
S3 storage classes and lifecycle policies
IAM policy evaluation logic
RDS Multi-AZ vs Read Replicas
Lambda VPC cold starts
CloudFront vs Global Accelerator
Auto Scaling policies
🔗 Helpful Resources: Practice platform: https://preporato.com
AWS VPC Documentation: https://docs.aws.amazon.com/vpc/lates...
Route Priority: https://docs.aws.amazon.com/vpc/lates...
NAT Gateway Troubleshooting: https://docs.aws.amazon.com/vpc/lates...
VPC Peering Routing: https://docs.aws.amazon.com/vpc/lates... #AWSSolutionsArchitect
#SAAC03 #VPC #VPCRouting #AWSNetworking #NATGateway #VPCPeering #AWSCertification #CloudComputing #AWSExam #TechCertification #CloudArchitecture #AWS2025 #ExamPrep #VPCRouteTables
💬 Comment below: What's your exam date? Drop it in the comments and I'll cheer you on! Also tell me - which VPC routing mistake have YOU made in production? NAT in wrong subnet?
Forgot route table association?
We've all been there!
👍 Like this video if VPC routing tables finally make sense!