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How can the organization update the MAC registration ev…

An organization is having an application which can start and stop an EC2 instance as per

schedule. The organization needs the MAC address of the instance to be registered with its
software. The instance is launched in EC2-CLASSIC. How can the organization update the MAC
registration every time an instance is booted?

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A.
The organization should write a boot strapping script which will get the MAC address from the
instance metadata and use that script to register with the application.

B.
The organization should provide a MAC address as a part of the user data. Thus, whenever the
instance is booted the script assigns the fixed MAC address to that instance.

C.
The instance MAC address never changes. Thus, it is not required to register the MAC address
every time.

D.
AWS never provides a MAC address to an instance; instead the instance ID is used for identifying
the instance for any software registration.

Explanation:
AWS provides an on demand, scalable infrastructure. AWS EC2 allows the user to launch OnDemand instances. AWS does not provide a fixed MAC address to the instances launched in
EC2-CLASSIC. If the instance is launched as a part of EC2-VPC, it can have an ENI which can
have a fixed MAC. However, with EC2-CLASSIC, every time the instance is started or stopped it
will have a new MAC address. To get this MAC, the organization can run a script on boot which
can fetch the instance metadata and get the MAC address from that instance metadata. Once the
MAC is received, the organization can register that MAC with the software.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AESDG-chapter-instancedata.html


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