AWS Interview Questions and Answer Part – 21

An ECS task can be described as:

• A virtual container profile
• A software tool used to manage cluster resources
• A software agent used to enable communication across a cluster environment
• A collection metadata defining the environment elements needed to launch Docker containers (Ans)

What is the function of this command?
docker search apache/ubuntu

• It will search your local Docker client environment for images related to both apache and ubuntu.
• It will search Docker Hub for images related to either apache or ubuntu.
• It will search your local Docker client environment for images related to either apache or ubuntu.
• It will search Docker Hub for images related to both apache and ubuntu. (Ans)

Which of these commands will associate a network interface with a Docker container?

• docker attach network newnet
• docker network connect newname newnet
• docker net connect newname newnet
• docker network connect newnet newname (Ans)

Which of these tools provides information about all the Docker resources on your system?

• docker ps
• docker inspect
• docker info (Ans)
• docker images

You cannot run your own database on the AWS platform, but can choose between RDS or DynamoDB.

• true
• false (Ans)

Which of the below features is NOT offered by Amazon RDS?

• replication
• patching
• stored procedure tuning (Ans)
• backups
• version upgrades

Local, instance storage for EC2 instances is best used for temporary storage

• true (Ans)
• false

How can you configure Auto Scaling?

• With the language-specific SDKs
• All of the above (Ans)
• Through the HTTP API
• Via command line tools

What problem do Elastic IPs solve?

• All of the above
• Lets you define a fixed IP and swap out the server it’s attached to (Ans)
• Sets a fixed public IP for 3 or more servers
• Provides simple load balancing between EC2 instances in the same AZ

Why might you use a load balancer in your distributed systems?

• all of the above (Ans)
• Provide resilience against servers going offline
• Offer enough servers to respond to all the inbound traffic
• Route traffic to geographically distributed servers

How does load balancing differ from high availability?

• Something can be load balanced but not highly available (Ans)
• They are the same thing
• A load balanced application doesn’t work across geographies

“Message sampling” in Amazon SQS refers to …

• none of the above
• queues being spread across servers so a “retrieve” operation only samples a subset of servers (Ans)
• large messages in SQS that only have a sample of their payload returned to the caller
• a technique for querying a set of messages that have a particular metadata attribute

Which of the below is NOT a fallacy of distributed computing?

• Topology doesn’t change
• The network is reliable
• There is only one administrator
• Databases can scale horizontally (Ans)

Which DNS record type is unique to Route 53?

• AAAA
• Alias (Ans)
• CNAME
• A

S3 is highly available if you configure it for multi-AZ replication

• true
• false (Ans)

Which of the below is NOT a scaling condition in Auto Scaling?

• Scheduled time period
• Ideal number of running instances
• None of the above (Ans)
• High resource (e.g. RAM, CPU) consumption
• SQS queue depth

Attach IAM roles to EC2 virtual machines to let applications securely connect to AWS services without embedding credentials.

• true (Ans)
• false

What are some ways to create fault tolerance in a distributed system?

• Set of “circuit breakers” and avoid cascading errors
• Use eventual consistency for data synchronization
• All of the above (Ans)
• Use timeouts and retries

Choose to use DynamoDB instead of RDS if …

• there is a need for high performance and a flexible data structure (Ans)
• None of the above
• you need to establish strong relationships between table items
• you need a database available in ALL AWS regions

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

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