Сети

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junior

What happens during DNS resolution and how does it affect System Design?

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juniornetworking

Browser -> DNS resolver -> root -> TLD -> authoritative NS -> IP address.

DNS resolves domain -> IP. Chain: browser cache -> OS cache -> Recursive resolver (ISP) -> Root NS (.com) -> TLD NS -> Authoritative NS -> IP. TTL determines caching duration. In system design: DNS-based load balancing (Route 53), GeoDNS for multi-region, low TTL for fast failover.

Когда да

Global load balancing, multi-region, failover strategies

Когда нет

Internal service discovery (use service mesh or Consul)

Совет на собеседовании

DNS is the first hop. Start system design with 'client enters URL -> DNS -> ...'

Альт:Service Discovery (Consul, Eureka)Service Mesh (Istio)

Свайп вправо — знаю, влево — не знаю

ArchCase

ArchCase

Сети

Browser -> DNS resolver -> root -> TLD -> authoritative NS -> IP address.