George has launched three EC2 instances inside the US-East-1a zone with his AWS account. Ray has
launched two EC2 instances in the US-East-1a zone with his AWS account. Which of the below entioned
statements will help George and Ray understand the availability zone (AZ. concept better?
A.
The instances of George and Ray will be running in the same data centre
B.
All the instances of George and Ray can communicate over a private IP with a minimal cost
C.
All the instances of George and Ray can communicate over a private IP without any cost
D.
The US-East-1a region of George and Ray can be different availability zones
Explanation:
Each AWS region has multiple, isolated locations known as Availability Zones. To ensure that the AWS
resources are distributed across the Availability Zones for a region, AWS independently maps the Availability
Zones to identifiers for each account. In this case the Availability Zone US-East-1a where George’s EC2
instances are running might not be the same location as the US-East-1a zone of Ray’s EC2 instances. There is
no way for the user to coordinate the Availability Zones between accounts.
D
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http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-regions-availability-zones
“To ensure that resources are distributed across the Availability Zones for a region, we independently map Availability Zones to identifiers for each account. For example, your Availability Zone us-east-1a might not be the same location as us-east-1a for another account. There’s no way for you to coordinate Availability Zones between accounts.”
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I think right answer may be “C” , there is no data transfer charges between instances in same availability zone using private IP.
Not D, “US-East-1a region of George ” , US-East-1a is not a region it is an Availability zone , also correct difference in terms of physical availability zone i.e datacenter may be different for two user but the name will be same
One Availability Zone name (for example, us-east-1a) in two AWS customer accounts may relate to different physical Availability Zones.
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Agree. There is no use-east-1a region.
But I would choose B. In order to communicate each other, they need a VPC peering which will cost $0.01/GB.
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d
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The us-east-1a is not a region. It is a AZ. D is wrong. There is no correct answer.
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A
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D is correct if there is a typo error in question.
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D
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A.
Not a typo. They specifically mention US-East-1a zone. So they describe zone level placement. Not D as they ARE in the same zone. Not B or C as they cannot initially work across accounts (requiring peering or VPN). They are definitely in the same zone. Answer is A.
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Agree.
The question talks about both persons did select the same availability zone, not the region.
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D. Confirmed by document http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-regions-availability-zones
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I say D.
Availability Zone = Datacenter
the question is to understand AZ concept. not how much it cost, or if it can communicate…
thanks for this site!
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