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Bhavesh Goswami
May 22, 2013 | Comments(39) |

Recently I took the AWS Solution Architect Certification and cleared it. My previous blog post was general information about AWS Certification and can be found here. This blog post is about some Sample Questions* for AWS Certification for AWS Certified Solution Architect. Answers with explanations are at the bottom.

Quiz 1


1) Answer: C.

S3’s consistency model is that of eventual consistency. This means that when an object is stored in S3, it is replicated in different datacenters (availability zones) in the same region. And it can take a short amount of time before all the data centers have a uniform view of the object (This time is usually less than a second, but if system is in distress it could take much longer). Thus in essence, S3 does not provide read-after-write consistency.

But the S3 team has modified the algorithm so as to provide read-after-write consistency for new objects. Which means that if I upload “object-n” for the first time (lets call it version-1), I get the opportunity to immediately read it without any consistency issues. This is though not supported for US-East region. Thus S3 support read-after-write consistency for new objects but for all regions except US-East.

2) Answer: B.
Using multipart upload, a single object in S3 can be upto 5TB in size.

3) Answer: C.
S3 by default do not encrypt the data stored into its service. But using Server Side Encryption feature, if proper headers are passes (in REST), S3 will first encrypt the data and then store that encrypted data.

4) Answers: A, B, C
Bucket namespace is global, which means that if someone creates a bucket called “pics” nobody else can create a bucket of the same name. Bucket names can contain alphanumeric characters which means we can have a bucket named “cloudthat1234”. And when we create a bucket, we have to select a region for the bucket, and all data stored in that bucket is physically stored in that region only (although the data can be accessed from anywhere in the world with proper credentials).

5) Answer: A
One of the known fallacies of EBS is that all the data of a single volume lives in a single Availability Zone. Thus it cannot withstand Availability zone failures.

6) Answer: C, D
Auto scaling cannot increase instance size of an EC2 instance. The idea is to be able to scale horizontally, and not vertically. Also D is correct as Auto scaling currently cannot automate RDS instance to do anything.

7) Answers: A, D
RDS MultiAZ does make database a single AZ failure tolerant, as it has automatic failover feature, where the secondly will become primary and application can keep accessing the database. It also increases availability during maintenance, as maintenance is performed first on secondary, then its made primary and then old-primary is updated.

8) Answers: B, C, D

9) Answer: C

10) Answer: C
The ip address of an ELB can change, so it’s not advisable to point domain directly at that ip address. Instead use CNAME to map to the ELB DNS name
I will also be conducting a bootcamp for this certification in Bangalore and online. If you are interested to join, please click here and fill out the form.

I have also uploaded part 2 of sample questions here.

39 Responses to “Sample Questions for Amazon Web Services Certified Solution Architect Certification (AWS Architect Certification) – Part I”

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