Not an Attribute of Elastic Network Interface

Answer - C.

The AWS Documentation mentions the following.

A network interface can include the following attributes:

· A primary private IPv4 address.

· One or more secondary private IPv4 addresses.

· One Elastic IP address (IPv4) per private IPv4 address.

· One public IPv4 address.

· One or more IPv6 addresses.

· One or more security groups.

· A MAC address.

· A source/destination check flag.

· A description.

For more information on Elastic Network interfaces, please refer to below URL:

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html

An Elastic Network Interface (ENI) is a virtual network interface that you can attach to an instance in a Virtual Private Cloud (VPC) in AWS. It enables you to create multiple network interfaces for an instance, and it can be used to create high-availability architectures, network appliances, and multiple IP addresses. Each ENI can have the following attributes:

A. A primary private IPv4 address: Each ENI must have a primary private IPv4 address, which is the first IP address assigned to the network interface. It can be assigned automatically by AWS or manually by the user.

B. One or more secondary private IPv4 addresses: ENIs can have multiple secondary private IPv4 addresses, which are additional IP addresses assigned to the network interface. You can use secondary IP addresses to host multiple websites or to create separate networks on the same instance.

C. One Elastic IP address (IPv4) per public IPv4 address: An Elastic IP address is a static, public IPv4 address that you can allocate to your AWS account and assign to your ENI. Each public IPv4 address assigned to an ENI must have a corresponding Elastic IP address.

D. One public IPv4 address: ENIs can be associated with public IPv4 addresses, which are routable on the internet. An instance can have up to five ENIs, and each ENI can be associated with a public IPv4 address.

Therefore, the answer to the question is D - "One public IPv4 address" is not an attribute of an Elastic Network Interface. While ENIs can be associated with public IPv4 addresses, they are not an inherent attribute of the ENI itself, but rather an association that can be made to the ENI.