Cloud Networking Fundamentals

What you will be able to do

• Explain the five core cloud decisions involved in cloud networking fundamentals.
• Choose a cloud resource or configuration that matches a stated workload requirement.
• Interpret provider state, workload behavior, and operational evidence before changing broader cloud state.
• Apply an inventory, select, configure, verify, recover, and document workflow to a realistic cloud decision.

01

Build the Cloud Decision Map

Build a cloud network model from virtual networks, address ranges, subnets, routes, security controls, and private connectivity.

Cloud services combine provider-managed layers with customer-controlled configuration. A useful design keeps workload need, resource scope, identity, network path, data, health, cost, and recovery visible instead of relying on a product name.

Start with an inventory and read-only evidence. Record the account or project, location, resource identifier, owner, configuration source, dependencies, expected behavior, and current observation before changing state.

02

Virtual network

A virtual cloud network provides an isolated logical boundary for addresses, routes, interfaces, and traffic controls. It answers one distinct architecture or operating question within cloud networking fundamentals.

Define the network purpose and nonoverlapping address plan before creating resources. Keep the target, location, identity, configuration, and observed outcome together so another person can reproduce the reasoning.

Respect this boundary: Do not assume isolation automatically permits required traffic or blocks every path. The expected evidence is the network inventory shows scope, ownership, and address range.

03

Subnet range

A subnet assigns an address range to resources within a provider-defined location or network scope. It answers one distinct architecture or operating question within cloud networking fundamentals.

Separate workloads by routing, exposure, lifecycle, and control requirements. Keep the target, location, identity, configuration, and observed outcome together so another person can reproduce the reasoning.

Respect this boundary: Do not create overlapping ranges that block peering, VPN, or future growth. The expected evidence is every subnet has a unique range and documented purpose.

04

Route selection

Routes choose the next path for traffic that matches a destination prefix. It answers one distinct architecture or operating question within cloud networking fundamentals.

Trace the effective route from source to destination and include the return path. Keep the target, location, identity, configuration, and observed outcome together so another person can reproduce the reasoning.

Respect this boundary: Do not diagnose reachability from firewall rules without checking routes. The expected evidence is the selected forward and return routes reach the intended targets.

05

Traffic control

Cloud firewalls or security groups evaluate traffic against configured direction, protocol, port, source, and destination conditions. It answers one distinct architecture or operating question within cloud networking fundamentals.

Allow only the flows required by the application and verify them from the correct source. Keep the target, location, identity, configuration, and observed outcome together so another person can reproduce the reasoning.

Respect this boundary: Do not use broad internet ranges as a temporary fix without authorization and removal. The expected evidence is approved flows pass while a defined unwanted flow is denied.

06

Private connectivity

Private connectivity links cloud networks, services, or on-premises environments without exposing the workload endpoint directly to the public internet. It answers one distinct architecture or operating question within cloud networking fundamentals.

Verify addressing, routes, name resolution, authentication, and traffic controls end to end. Keep the target, location, identity, configuration, and observed outcome together so another person can reproduce the reasoning.

Respect this boundary: Stop when overlapping ranges or missing ownership make the path ambiguous. The expected evidence is the private path works and the public path remains absent or blocked.

07

Verify One Cloud Change

Before changing cloud state, name the exact resource, required authorization, user impact, expected signal, cost effect, and recovery path. Preview the scope with an inventory or policy view and protect data or configuration that cannot be recreated safely.

Make one narrow change and stop. If the provider response, location, identity, dependency, or effective configuration differs from the plan, preserve that evidence and reassess instead of adding unrelated changes.

A successful API response or portal notification proves only that an operation was accepted. Repeat the original workload path, inspect health and security signals, verify the resulting resource state independently, and remove temporary access or test resources.

08

Recap Before Practice and Prove

Start with virtual network. Define the network purpose and nonoverlapping address plan before creating resources. Confirm that the network inventory shows scope, ownership, and address range.

Keep subnet range separate. Separate workloads by routing, exposure, lifecycle, and control requirements. Respect this boundary: do not create overlapping ranges that block peering, vpn, or future growth.

Use route selection as its own decision. Trace the effective route from source to destination and include the return path. Preserve the resulting evidence.

Before a broader change, review traffic control. Allow only the flows required by the application and verify them from the correct source. Stop when do not use broad internet ranges as a temporary fix without authorization and removal.

Finish with private connectivity. Verify addressing, routes, name resolution, authentication, and traffic controls end to end. Record the final state, health signal, recovery boundary, owner, and next decision.