Question

The source and destination of a security group can be either

Answer 1

Answer:

Explanation:

Security groups are stateful — if you send a request from your instance, the response traffic for that request is allowed to flow in regardless of inbound security group rules. Responses to allowed inbound traffic are allowed to flow out, regardless of outbound rules.

Answer 2

The source and destination of a security group can be either an destination port range whicich could be either an IPv4 or IPv6 CIDR block, or a single IPv4 or IPv6 address.

Explanation:

• The security group acts like a virtual firewall for your instance to control inbound and outbound flow of traffic.
• It is possible to assign up to five security groups to the instance when the  instance launched in a VPC.  Security groups do not act the subnet level and act at the instance level
• There are no inbound rules when the the  security group is created hence there is no inbound traffic starting from another host to the instance and it is not allowed unless the  inbound rules are added to the security group.

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