====== Route Table ======

**What it is:** A set of routing rules that decide where network traffic goes.

**What it’s for:**
  * Send traffic to IGW, NAT, VPC endpoints, peering, etc.
  * Define public vs private subnets through default routes.

**Key ideas:**
  * Each subnet is associated with one route table (main or custom).
  * The most important route in exams:
    * `0.0.0.0/0` = “default route” (all IPv4 destinations).

**Exam cues:**
  * “make subnet public” → add `0.0.0.0/0 → IGW`.
  * “private subnet outbound internet” → `0.0.0.0/0 → NAT`.

**Hard words:**
  * *routing* /ˈruːtɪŋ/: định tuyến
  * *destination* /ˌdestɪˈneɪʃn/: đích đến
  * *default route* /dɪˈfɔːlt ruːt/: tuyến mặc định