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
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