Demystifying VPCs: Networking Basics for Cloud Engineers

𝗩𝗶𝗿𝘁𝘂𝗮𝗹 𝗣𝗿𝗶𝘃𝗮𝘁𝗲 𝗖𝗹𝗼𝘂𝗱 (𝗩𝗣𝗖) – your own isolated section of the AWS network. Think of it as a 𝗽𝗿𝗶𝘃𝗮𝘁𝗲 𝗱𝗮𝘁𝗮 𝗰𝗲𝗻𝘁𝗲𝗿 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗹𝗼𝘂𝗱 that you fully control.

🔑 𝗞𝗲𝘆 𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀 𝗼𝗳 𝗮 𝗩𝗣𝗖:

𝗦𝘂𝗯𝗻𝗲𝘁𝘀 → Divide your VPC into smaller networks (Public vs Private).
𝗥𝗼𝘂𝘁𝗲 𝗧𝗮𝗯𝗹𝗲𝘀 → Define how traffic flows inside and outside your VPC.
𝗜𝗻𝘁𝗲𝗿𝗻𝗲𝘁 𝗚𝗮𝘁𝗲𝘄𝗮𝘆 (𝗜𝗚𝗪) → Lets public subnets connect to the internet.
𝗡𝗔𝗧 𝗚𝗮𝘁𝗲𝘄𝗮𝘆 → Allows private subnets to reach the internet securely.
𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗚𝗿𝗼𝘂𝗽𝘀 & 𝗡𝗔𝗖𝗟𝘀 → Act as firewalls to control inbound/outbound traffic.

💡 𝗪𝗵𝘆 𝗩𝗣𝗖 𝗺𝗮𝘁𝘁𝗲𝗿𝘀?

Securely isolate your resources.
Design scalable network architectures.
Control access at a granular level.

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LAN = On-prem, physical, local.
VPC = Cloud-based, virtual, scalable.

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