PCA - Pre-exam Quiz 2

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This is a quiz that resembles (types of questions, level of complexity etc) the one you'll go through the real PCA exam. Make sure to feel confident with this one before signing up for the exam.

My rule of thumb would be: if I'd get 80-90% of the answers right, I would feel quite comfortable with taking the real one. If not, I'd try to identify the grey areas and I would commit a bit of time to cover those before taking the exam.

Good luck!

Your company has decided to make a major revision of their API in order to create a better experience for their developers. They need to keep the old version of the API still available, while allowing new customers and testers to access the new one. What should they do?

1 point

Configure a new load balancer for the new version of the API.

Reconfigure the old clients to use the new endpoint for the new API.

Have the old API forward traffic to the new API based on the path.

Use separate backend services for each API path behind the same load balancer.

Clear selection

You are transferring a very large number of small files to GCS bucket from on-premises location. You need to speed up transfer times. Assuming a fast network connection, which two actions can you take? (choose 2)

1 point

Compress and combine files before transferring.

Use the "-r" option for large transfers.

Copy the files in bigger pieces at a time.

Use the "-m" option for parallel processing.

Your marketing department wants to send out a promotional campaign. The development team wants to minimize direct operation management. They project a wie range of customer responses, ranging from 100 to 500,000 click-throughs per day. The link leads to a simple website that explains the promotion and collects user information and preferences. Which services would you use to deploy such a system?

1 point

Use a single GCE VM to host a web server, backed by Cloud SQL.

Use a GKE cluster to serve the website and stor data on a Persistent Disk.

Use a managed service group to serve the website and Cloud Bigtable to store user data.

Use App Engine to serve the website and Datastore to store user data.

Clear selection

One of the large data analytics companies uses BigQuery, Bigtable, Dataproc and GCS services. The use a hybrid infrastructure involving on-premises and GCP. Connectivity is realized based on Cloud VPN. One of the main challenges is mitigating data exfiltration risks originating from stolen identities, misconfigured IAM, malicious insiders etc. What GCP service can they use to address those challenges?

1 point

Shared VPC

Cloud Armor

VPC Service Controls

Resource Manager

Clear selection

You work for an international company and manage many GCE instances using SSH and RDP protocols.

For security reasons, management asks you that VMs can no longer have external IPs.

How can you fulfil this request, while still being able to manage those VMs?

1 point

Use Bastion Hosts

Use NAT instances

Use IAP TCP Forwarding

Use Security Command Center

Clear selection

Your company has decided to build a backup replica of their on-premises user authentication PostgreSQL database on GCP. The database is 4 TB and large updates are frequent. The solution requires RFC1918 address space. Which networking approach would be the best choice?

1 point

Create two VPN tunnels with the same Cloud VPN gateway to the same destination VPN gateway.

Use Direct Peering.

Use Dedicated or Partner Interconnect.

Connect to datacenter network using Cloud VPN.

Clear selection

To ensure your application will handle the load even if an entire zone fails, what should you do? (choose 2)

1 point

Don't select "multizone" option when creating managed instance groups.

Spread your managed instance group over two zones and overprovision by 100% (for two zones).

Create a regional, unmanaged instance group and spread your instances across multiple zones.

Overprovision your regional managed instance group by at least 50% (for three zones).

Clear selection

You want to optimize the performance of an accurate, real-time, weather-charting application. The data comes from 50,000 sensors sending 10 readings a second, in the format of a timestamp and sensor reading.

Where should you store the data?

1 point

BigQuery

Cloud SQL

Bigtable

GCS

Clear selection

You are creating a solution to remove backup files older than 90 days from your backup Cloud Storage bucket. You want to optimize ongoing Cloud Storage spend.

What should you do?

1 point

Write a lifecycle management rule in XML and push it to the bucket with gsutil

Write a lifecycle management rule in JSON and push it to the bucket with gsutil

Schedule a cron script using gsutil ls -lr gs://backups/** to find and remove items older than 90 days

Schedule a cron script using gsutil ls -l gs://backups/** to find and remove items older than 90 days and schedule it with cron

Clear selection

Your company has successfully migrated to the cloud and wants to analyze their data stream to optimize operations. They do not have any existing code for this analysis, so they are exploring all their options. These options include a mix of batch and stream processing, as they are running some hourly jobs and live processing some data as it comes in.

Which technology should they use for this?

1 point

Dataproc

Dataflow

GKE with Bigtable

GCE with BigQuery

Clear selection

A production database virtual machine on Google Compute Engine has an ext4-formatted persistent disk for data files. The database is about to run out of storage space.

How can you remediate the problem with the least amount of downtime?

1 point

Shut down the virtual machine, use the Cloud Platform Console to increase the persistent disk size, then restart the virtual machine

In the Cloud Platform Console, increase the size of the persistent disk and use the resize2fs command in Linux.

In the Cloud Platform Console, create a new persistent disk attached to the virtual machine, format and mount it, and configure the database service to move the files to the new disk

In the Cloud Platform Console, create a snapshot of the persistent disk restore the snapshot to a new larger disk, unmount the old disk, mount the new disk and restart the database service

Clear selection

You need to reduce the number of unplanned rollbacks of erroneous production deployments in your company’s web hosting platform. Improvement to the QA/Test processes accomplished an 80% reduction.

Which additional two approaches can you take to further optimize the release process? Choose 2 answers.

1 point

Introduce a green-blue deployment model

Replace the QA environment with canary releases

Fragment the monolithic platform into microservices

Reduce the platform’s dependency on relational database systems

Replace the platform’s relational database systems with a NoSQL database

Your company wants to track whether someone is present in a meeting room reserved for a scheduled meeting. There are 1000 meeting rooms across 5 offices on 3 continents. Each room is equipped with a motion sensor that reports its status every second. The data from the motion detector includes only a sensor ID and several different discrete items of information. Analysts will use this data, together with information about account owners and office locations.

Which database type should you use?

1 point

Flat file

NoSQL

Relational

Blobstore

Clear selection

Your company places a high value on being responsive and meeting customer needs quickly. Their primary business objectives are release speed and agility.

You want to reduce the chance of security errors being accidentally introduced.

Which two actions can you take? Choose 2 answers.

1 point

Ensure every code check-in is peer reviewed by a security SME

Use source code security analyzers as part of the CI/CD pipeline

Ensure you have stubs to unit test all interfaces between components

Enable code signing and a trusted binary repository integrated with your CI/CD pipeline

Run a vulnerability security scanner as part of your continuous-integration /continuous-delivery (CI/CD) pipeline

You have an outage in your Compute Engine managed instance group: all instance keep restarting after 5 seconds. You have a health check configured, but autoscaling is disabled. Your colleague, who is a Linux expert, offered to look into the issue. You need to make sure that he can access the VMs. What should you do?

1 point

Grant your colleague the IAM role of project Viewer

Perform a rolling restart on the instance group

Disable the health check for the instance group. Add his SSH key to the project-wide SSH keys

Disable autoscaling for the instance group. Add his SSH key to the project-wide SSH Keys

Clear selection

You are analyzing and defining business processes to support your startup’s trial usage of GCP, and you don’t yet know what consumer demand for your product will be. Your manager requires you to minimize GCP service costs and adhere to Google best practices. What should you do?

1 point

Utilize free tier and sustained use discounts. Provision a staff position for service cost management.

Utilize free tier and sustained use discounts. Provide training to the team about service cost management.

Utilize free tier and committed use discounts. Provision a staff position for service cost management.

Utilize free tier and committed use discounts. Provide training to the team about service cost management.

Clear selection

Your organization wants to control IAM policies for different departments independently, but centrally.

Which approach should you take?

1 point

Multiple Organizations with multiple Folders

Multiple Organizations, one for each department

A single Organization with Folders for each department

A single Organization with multiple projects, each with a central owner

Clear selection

Your organization has a 3-tier web application deployed in the same network on Google Cloud Platform. Each tier (web, API, and database) scales independently of the others. Network traffic should flow through the web to the API tier and then on to the database tier. Traffic should not flow between the web and the database tier.

How should you configure the network?

1 point

Add each tier to a different subnetwork

Set up software based firewalls on individual VMs

Add network tags to each tier and set up routes to allow the desired traffic flow

Add network tags to each tier and set up firewall rules to allow the desired traffic flow

Clear selection

Your company wants to try out the cloud with low risk. They want to archive approximately 100 TB of their log data to the cloud and test the analytics features available to them there, while also retaining that data as a long-term disaster recovery backup.

Which two steps should you take? Choose 2 answers.

1 point

Load logs into Google BigQuery

Load logs into Google Cloud SQL

Import logs into Google Cloud Operations Suite

Insert logs into Google Cloud Bigtable

Upload log files into Google Cloud Storage

You created a pipeline that can deploy your source code changes to your infrastructure in instance groups for self-healing. One of the changes negatively affects your key performance indicator. You are not sure how to fix it, and investigation could take up to a week.

What should you do?

1 point

Revert the source code change, and rerun the deployment pipeline

Log into the servers with the bad code change, and swap in the previous code

Change the instance group template to the previous one, and delete all instances

Clear selection

You have created several pre-emptible Linux virtual machine instances using Google Compute Engine. You want to properly shut down your application before the virtual machines are preempted.

What should you do?

1 point

Create a shutdown script named k99.shutdown in the /etc/rc.6.d/ directory

Create a shutdown script registered as a xinetd service in Linux and configure a Stackdriver endpoint check to call the service

Create a shutdown script and use it as the value for a new metadata entry with the key shutdown-script in the Cloud Platform Console when you create the new virtual machine instance

Create a shutdown script, registered as a xinetd service in Linux, and use the gcloud compute instances add-metadata command to specify the service URL as the value for a new metadata entry with the key shutdownscript-url

Clear selection

Your company runs several databases on a single MySQL instance. They need to take backups of a specific database at regular intervals. The backup activity needs to complete as quickly as possible and cannot be allowed to impact disk performance.

How should you configure the storage?

1 point

Configure a cron job to use the gcloud tool to take regular backups using persistent disk snapshots.

Mount a Local SSD volume as the backup location. After the backup is complete, use gsutil to move the backup to Google Cloud Storage.

Use gcsfuse to mount a Google Cloud Storage bucket as a volume directly on the instance and write backups to the mounted location using mysqldump

Mount additional persistent disk volumes onto each virtual machine (VM) instance in a RAID10 array and use LVM to create snapshots to send to Cloud Storage

Clear selection

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