Amazon Virtual Private Cloud (VPC) | Elastic Network Interfaces

Question 1

How are IAM accounts impacted by default VPC?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 1

If your AWS account has a default VPC, any IAM accounts associated with your AWS account use the same default VPC as your AWS account.

Question 2

Can I attach or detach one or more network interfaces to an EC2 instance while it’s running?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 2

Yes.

Question 3

Can I have more than two network interfaces attached to my EC2 instance?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 3

The total number of network interfaces that can be attached to an EC2 instance depends on the instance type. See the EC2 User Guide for more information on the number of allowed network interfaces per instance type.

Question 4

Can I attach a network interface in one Availability Zone to an instance in another Availability Zone?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 4

Network interfaces can only be attached to instances residing in the same Availability Zone.

Question 5

Can I attach a network interface in one VPC to an instance in another VPC?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 5

Network interfaces can only be attached to instances in the same VPC as the interface.

Question 6

Can I use Elastic Network Interfaces as a way to host multiple websites requiring separate IP addresses on a single instance?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 6

Yes, however, this is not a use case best suited for multiple interfaces. Instead, assign additional private IP addresses to the instance and then associate EIPs to the private IPs as needed.

Question 7

Will I get charged for an Elastic IP Address that is associated to a network interface but the network interface isn’t attached to a running instance?

Elastic Network Interfaces

Amazon Virtual Private Cloud (VPC) | Networking & Content Delivery

Answer 7

Yes.