Compute
EC2 |
Virtual servers, you manage the OS. Exam asks: instance families for compute vs memory vs storage |
Lambda |
Serverless functions. Exam asks: event-driven, short tasks, zero servers |
Auto Scaling |
Adds/removes EC2 on demand. Exam asks: spiky traffic, always pair with ELB |
Elastic Beanstalk |
PaaS deploys. Exam asks: fastest deploy without managing infra |
Compute block for SAA-C03 sheet
Storage
S3 |
Object storage, 11 nines durability. Exam asks: static websites, data lakes, unstructured |
S3 storage classes |
Standard to Intelligent-Tiering to Glacier. Exam asks: pick by access frequency to cut cost |
EBS |
Block storage for one EC2 instance. Exam asks: gp3 vs io2 vs st1 by IOPS |
EFS |
Shared file storage across instances. Exam asks: multiple EC2 needing one filesystem |
Storage Gateway |
Hybrid on-prem to AWS. Exam asks: extend local storage to cloud |
Storage block for SAA-C03 sheet
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Networking
VPC |
Your isolated network. Exam asks: public vs private subnets, design with both |
ELB (ALB/NLB/GWLB) |
Load balancers. Exam asks: ALB=HTTP routing, NLB=extreme TCP performance |
Route 53 |
DNS plus routing policies. Exam asks: latency-based, geolocation, failover |
CloudFront |
CDN. Exam asks: cache at edge, pair with S3 or ALB origin |
Direct Connect |
Private dedicated link. Exam asks: consistent bandwidth, hybrid, bypasses internet |
Networking block for SAA-C03 sheet
Databases
RDS |
Managed relational. Exam asks: Multi-AZ for HA, read replicas for scale |
Aurora |
AWS-built relational. Exam asks: MySQL/Postgres compatible, fastest failover |
DynamoDB |
Serverless NoSQL. Exam asks: single-digit ms latency, massive scale |
ElastiCache |
In-memory cache. Exam asks: cut database load for read-heavy apps |
Redshift |
Data warehouse. Exam asks: analytics over petabytes, not transactions |
Databases block for SAA-C03 sheet
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Security & Identity
IAM |
Users, roles, policies. Exam asks: least privilege; roles for EC2, never embed keys |
Security Groups |
Stateful instance firewall, allow only. Exam asks: SG vs NACL differences |
NACLs |
Stateless subnet firewall. Exam asks: rule order matters, lowest numbered first |
KMS |
Encryption key management. Exam asks: SSE-S3 vs SSE-KMS vs SSE-C |
WAF / Shield |
Web firewall / DDoS protection. Exam asks: Layer 7 filtering vs volumetric defense |
Security & Identity block for SAA-C03 sheet
Design Principles
Decouple |
SQS/SNS between tiers; "loosely coupled" is almost always right |
Stateless |
nothing on the instance; store state in ElastiCache/DynamoDB |
Multi-AZ |
high availability; NOT multi-region unless disaster recovery is named |
Cheapest valid |
the exam rewards cost-optimized answers; serverless and managed first |
Design Principles block for SAA-C03 sheet
More from ByteBar
SAA-C03 Study Guide — $5 |
Exam-ready? Get the full study guide at bytebarhq.com |
ByteBar on YouTube |
Free AWS walkthroughs: youtube.com/@bytebarexamprep |
Footer block for SAA-C03 sheet
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