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Networking & Content DeliveryVPCSecuritySecurity Groups Overview

Security Group

  • It is a virtual firewall works at egress network interface or instance level.

  • Security group work at instance level.

  • Up to five security group per EC2 instance can be attached.

  • Can only have a permit rules, don’t have deny rules.

  • It is stateful in nature, if a traffic is allowed in inbound rules it would be automatically into outbound rules but not vice versa.

Stateful is nothing but all rules are evaluated before decision to allow traffic

  • By default anything aside from permit or mentioned inbound or outbound rule will be considered denied.

  • By default all traffic is denied.

  • Security group have rules that control inbound and outbound instance traffic

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