2.5 Cloud Architecture & Hybrid Cloud Networking (VPCs, Direct Connect)

🎯 Key CompTIA Network+ Exam Takeaways

• In PaaS, the provider manages the hardware, hypervisor, and OS; the customer manages application code and data.
• NAT Gateways allow private subnet instances to initiate outbound Internet connections while blocking inbound unsolicited Internet traffic.
• Dedicated cloud circuits (Direct Connect, ExpressRoute) bypass the public Internet to provide consistent high-throughput, low-jitter transport.

Cloud computing delivers scalable virtualized infrastructure under three primary service models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).

Virtual Private Clouds (VPCs) provide isolated software-defined networks in the cloud. Private subnets house sensitive workloads like databases that lack public IPs. A NAT Gateway deployed in a public subnet translates private IP requests to reach external patch repositories.

For enterprises requiring predictable latency and guaranteed bandwidth, dedicated private interconnects (such as AWS Direct Connect or Azure ExpressRoute) establish direct fiber connections from on-premises data centers into the cloud provider fabric.

⚠️ Common Pearson VUE Exam Traps

• Confusing IaaS (where the customer manages the operating system) with PaaS (where the provider manages the operating system).
• Assuming standard Internet IPsec VPNs provide guaranteed SLAs; only dedicated private circuits eliminate Internet congestion.