각 AZ는 100km 이내에 존재한다.

1) Explicit subnet association이란? -> default route table을 사용하지 않고, 내가 만든 custom route table을 사용하겠다. 2) Subnets without explicit associations이란? -> custom route table을 사용하지 않는 subnet들 (= 얘네들은 모두 default route table에 연결됨)

ㄴ 0.0.0.0/0으로 향하는 모든 traffic을 target으로 routing한다. Q) 그러면 local의 의미는? 추측) 10.0.0.0/16을 향해서 가는건 그냥 10.0.0.0/16으로 보내라는 것 같다. (즉, 자기들끼리 통신 허용)

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