Cloud Compute, Storage, Networking and IAM Explained
Understand the four building blocks through a small application.
Part of the Cloud Computing track: modules, projects and first roles →
By the GullyMentor team · 5 min read · Published 2026-10-18 · Updated 2026-11-06 · Sources listed at the end. Not a promise about mentorship outcomes.
Cloud compute runs your code, storage keeps your data, networking connects the parts and identity and access management (IAM) decides who or what may do each action. A small application usually depends on all four, and most beginner failures come from not knowing which of the four caused the problem.
What is compute?
A virtual machine, container service or managed runtime executes application code. The right choice depends on the workload and how much operation you want to manage. A virtual machine gives you a server to patch and run. A managed runtime asks you to supply code and handles more of the server for you.
For a fictional student project, ask what starts the application, how it stays healthy and how it is updated. "Hosted in the cloud" does not answer those questions.
What is storage?
Different data needs different storage behaviour. Files, database records and temporary runtime data are not interchangeable. Consider persistence, access patterns and recovery.
If an application writes an uploaded file only to a temporary runtime filesystem, the file may not survive replacement of that runtime. Document where durable data lives.
What is networking?
DNS maps a name to a destination; routing and firewall rules influence whether traffic reaches the service. Ports identify listening services, while HTTPS protects the connection to an appropriately configured endpoint.
Trace one request from the browser to the app and its data. A public website does not mean every backend component should be publicly reachable.
What is IAM?
Identity and access management defines permissions for people and workloads. Separate normal use from administration and grant only the actions required for the task.
A private storage bucket and an application allowed to read it form a different access arrangement from a public bucket. Test with the intended identity, not only with an administrator account.
How do the four fit together in one example?
Take a fictional document-sharing site for a college club. 1. A visitor types the site name. DNS points the name at the hosting endpoint (networking). 2. The hosting runtime receives the request and runs the page code (compute). 3. The code asks for a PDF. The runtime's identity has permission to read one private folder (IAM). 4. The file comes from a durable store, not the runtime's temporary disk (storage). 5. The response returns over HTTPS (networking).
If step 3 is missing, the page loads but the download fails with an access error. If step 4 uses temporary disk, files vanish after a restart. Each symptom points to a different layer.
How do you build a practice diagram?
Draw a sample site, its runtime, a private document store and two identities: a visitor and an administrator. Label every connection and permission.
Then ask what happens if the runtime restarts, a credential is revoked or storage becomes unavailable. Your diagram should make those dependencies understandable.
What are the common mistakes?
- Learning service names without understanding what each does.
- Using an administrator account for every test.
- Making a storage location public to "make it work".
- Leaving credentials in source code.
- Forgetting that DNS changes can take time to be seen.
How do you check you got it?
Explain your diagram to someone in two minutes, then answer four questions: where does durable data live, who can read it, what happens on restart and how does a request reach the app? Then test one allowed and one denied action with a non-admin identity.
Cost and cleanup
Each component may have its own billing behaviour. Removing compute may leave storage, snapshots or networking resources behind. Include a teardown checklist and verify the account after the exercise. AWS documents cost monitoring in AWS Budgets.
What does each layer look like when it fails?
- Compute failure: the page does not respond at all, or a process keeps restarting. Check logs and health status.
- Storage failure: pages load but uploads or downloads fail, or data is missing after a restart. Check where the data is written.
- Networking failure: the name does not resolve, the connection times out or the certificate is rejected. Check DNS, ports and firewall rules.
- IAM failure: the service is running but returns "access denied". Check which identity made the request and what it may do.
Learning to match a symptom to a layer is the most useful troubleshooting habit a beginner can build.
What should you build next?
Build the small static site from Cloud Computing Project Ideas for Beginners and document each of the four layers. For the wider order of learning, read the Cloud Computing Roadmap or see the Cloud Computing track.
Concepts help you compare platforms and explain failures even when the interface changes.
Sources & further reading
Examples and practice recommendations are educational illustrations. Tool documentation and programme inclusions should be checked for your intended use.