Apa sing dadi VPC ing AWS?

Question

Accepted Answer

A **VPC** (Virtual Private Cloud) yaiku **jaringan virtual sing terisolasi** milikmu ing AWS — ngendi sampeyan ngluncurake resource (kaya EC2 instances) kanthi kontrol marang IP ranges, subnets, routing, lan security. Iki dadi fondasi jaringan kanggo resource AWS.

## Apa sing dadi VPC

```text
A VPC is a logically ISOLATED virtual network in AWS that YOU control:
  → define your IP address range (CIDR block, e.g. 10.0.0.0/16)
  → divide it into SUBNETS; control ROUTING and security
  → your resources (EC2, RDS, etc.) live inside it, isolated from other networks
→ Like having your own private network in the cloud.
```

## Komponen kunci

```text
SUBNET → a segment of the VPC's IP range, placed in one Availability Zone:
  PUBLIC subnet  → has a route to the internet (via an Internet Gateway) — for
    public-facing resources (web servers, load balancers)
  PRIVATE subnet → NO direct internet route — for backend resources (databases, app
    servers) that shouldn't be publicly reachable
INTERNET GATEWAY → connects the VPC to the internet (for public subnets)
NAT GATEWAY → lets PRIVATE subnet resources reach OUT to the internet (e.g. updates)
  without being reachable FROM the internet
ROUTE TABLES → control where traffic goes
SECURITY GROUPS / NACLs → firewalls controlling traffic to resources/subnets
```

## Arsitektur sing khas

```text
VPC (10.0.0.0/16)
  ├─ PUBLIC subnet  → load balancer, bastion (internet-facing)
  └─ PRIVATE subnet → app servers, DATABASE (no direct internet access — more secure)
→ Public subnet handles incoming traffic; private subnet protects backend resources.
```

## Apa sing penting

Ngrerteni VPC iku penting amarga iki dadi **fondasi jaringan** kanggo resource AWS — mula-mula kabeh bisa tumindak ing VPC — mula kuwajiban pengetahuan dasar AWS kanggo ngluncurake resource kanthi aman.

A VPC nyadiyakake **jaringan virtual sing terisolasi** dhewe ing AWS ngendi sampeyan ngontrol IP ranges, subnets, routing, lan security, menehi sampeyan kemampuan kanggo ngrancang jaringan kaya jaringan premises-on-premises nanging ing cloud.

Ngrerteni **komponen kunci** kuwajiban kanggo ngluncurake resource kanthi bener: **subnets** (bagian saka jaringan, penting banget dibagi dadi **public** subnets kanthi akses internet kanggo resource ngarep publik lan **private** subnets tanpa akses internet langsung kanggo resource backend), **internet gateways** (nyambung menyang internet), **NAT gateways** (nggawekake resource private bisa metu tanpa bisa dikaketi saka jaba), route tables, lan security groups/NACLs (firewalls).

Pembedaan **public/private subnet iku sing penting banget kanggo security**: nglumpukake resource backend (luwih-luwih databases) ing **private subnets** — ndhefen saka akses internet langsung nalika resource ngarep publik (load balancers, web servers) nangani traffic mlebu ing public subnets — yaiku arsitektur security dasar sing nyegah eksposi langsung saka sistem backend sing peka.

Ngrerteni arsitektur khas iki (public subnet kanggo komponen ngarep internet, private subnet ngilang databases lan app servers) nggambarake rancangan jaringan sing bener lan aman.

Amarga mula-mula kabeh resource AWS dumadi ing VPC lan arsitektur jaringan sing tepat (luwih-luwih pemisahan public/private subnet) kuwajiban kanggo security, lan amarga ngrerteni VPC, subnets, lan komponen kuwajiban kanggo ngluncurake resource AWS kanthi bener lan aman, ngrerteni dasar VPC yaiku kuwajiban, pengetahuan dasar AWS — lapisan jaringan sing ndhefen ngandhut AWS deployments lan topik ngendi pola security public/private subnet khususnya penting kanggo ngilang resource backend, ndadeke iki pengetahuan kunci kanggo sapa wae sing ngrancang infrastruktur AWS.