Wiki.Quizz.vn

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

====== Subnet ======

**What it is:** A smaller network segment inside a VPC, mapped to a single Availability Zone.

**What it’s for:**
  * Organize resources by exposure level (public/private).
  * Spread across AZs for high availability.

**Key ideas:**
  * Best practice: create at least 2 subnets in 2 AZs.
  * A subnet becomes “public” or “private” mainly by its route table:
    * Public subnet has a route to IGW.
    * Private subnet does not; it may route to NAT for outbound internet.

**Exam cues:**
  * “subnet per AZ” → typical HA design.
  * “place DB in private subnet” → DB not directly reachable from internet.

**Hard words:**
  * *segment* /ˈseɡmənt/: phân đoạn
  * *mapped* /mæpt/: ánh xạ/gắn với
  * *exposure* /ɪkˈspoʊʒər/: mức độ lộ ra ngoài

**Child pages:**
  * [[aws:network:public-subnet|Public Subnet]]
  * [[aws:network:private-subnet|Private Subnet]]