PCSE practice questions 271–280

1. Question 271 · 356 in bank

   A customer deployed an application on Compute Engine that takes advantage of the elastic nature of cloud computing. How can you work with Infrastructure Operations Engineers to best ensure that Windows Compute Engine VMs are up to date with all the latest OS patches?

   • ABuild new base images when patches are available, and use a CI/CD pipeline to rebuild VMs, deploying incrementally.
   • BFederate a Domain Controller into Compute Engine, and roll out weekly patches via Group Policy Object.
   • CUse Deployment Manager to provision updated VMs into new serving Instance Groups (IGs).
   • DReboot all VMs during the weekly maintenance window and allow the StartUp Script to download the latest patches from the internet.

   Show answer

   Answer: A

   Explanation

   Answer is A. Compute Engine doesn't automatically update the OS or the software on your deployed instances. You will need to patch or update your deployed Compute Engine instances when necessary. However, in the cloud it is not recommended that you patch or update individual running instances. Instead it is best to patch the image that was used to launch the instance and then replace each affected instance with a new copy.

   Source: Adapted from community discussion — genesis3k

   References

   • Google Cloud documentation
   • Google Cloud documentation
   • Google Cloud documentation

   Next question

2. Question 272 · 356 in bank

   Your team needs to make sure that their backend database can only be accessed by the frontend application and no other instances on the network. How should your team design this network?

   • ACreate an ingress firewall rule to allow access only from the application to the database using firewall tags.
   • BCreate a different subnet for the frontend application and database to ensure network isolation.
   • CCreate two VPC networks, and connect the two networks using Cloud VPN gateways to ensure network isolation.
   • DCreate two VPC networks, and connect the two networks using VPC peering to ensure network isolation.

   Show answer

   Answer: A

   Explanation

   Although A is correct, but B would be more secure when combined with firewall rules to restrict traffic based on subnets. Ideal solution would be to use Service Account based firewall rules instead of tag based. See the below paragragraph from https://cloud.google.com/solutions/best-practices-vpc-design "However, even though it is possible to uses tags for target filtering in this manner, we recommend that you use service accounts where possible. Target tags are not access-controlled and can be changed by someone with the instanceAdmin role while VMs are in service. Service accounts are access-controlled, meaning that a specific user must be explicitly authorized to use a service account. There can only be one service account per instance, whereas there can be multiple tags. Also, service accounts assigned to a VM can only be changed when the VM is stopped"

   Source: Adapted from community discussion — singhjoga

   References

   • Google Cloud documentation
   • Google Cloud documentation

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3. Question 273 · 356 in bank

   An organization receives an increasing number of phishing emails. Which method should be used to protect employee credentials in this situation?

   • AMultifactor Authentication
   • BA strict password policy
   • CCaptcha on login pages
   • DEncrypted emails

   Show answer

   Answer: A

   Explanation

   "A" Encrypting emails (D) does not prevent or protect against phishing. Phishing leads to attacker getting a user's password. In order to protect against the "impact" of phishing, requiring a second factor would prevent the attacker from logging in using only the password once stolen.

   Source: Adapted from community discussion — [Removed]

   References

   • Google Cloud documentation
   • Google Cloud documentation
   • Google Cloud documentation

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4. Question 274 · 356 in bank

   A customer is collaborating with another company to build an application on Compute Engine. The customer is building the application tier in their GCP Organization, and the other company is building the storage tier in a different GCP Organization. This is a 3-tier web application. Communication between portions of the application must not traverse the public internet by any means. Which connectivity option should be implemented?

   • AVPC peering
   • BCloud VPN
   • CCloud Interconnect
   • DShared VPC

   Show answer

   Answer: A

   References

   • Google Cloud documentation
   • Google Cloud documentation

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5. Question 275 · 356 in bank

   Your team wants to make sure Compute Engine instances running in your production project do not have public IP addresses. The frontend application Compute Engine instances will require public IPs. The product engineers have the Editor role to modify resources. Your team wants to enforce this requirement. How should your team meet these requirements?

   • AEnable Private Access on the VPC network in the production project.
   • BRemove the Editor role and grant the Compute Admin IAM role to the engineers.
   • CSet up an organization policy to only permit public IPs for the front-end Compute Engine instances.
   • DSet up a VPC network with two subnets: one with public IPs and one without public IPs.

   Show answer

   Answer: C

   Explanation

   Intitally I agreed with you but after looking at the link above it does say this. This list constraint defines the set of Compute Engine VM instances that are allowed to use external IP addresses. By default, all VM instances are allowed to use external IP addresses. The allowed/denied list of VM instances must be identified by the VM instance name, in the form: projects/PROJECT_ID/zones/ZONE/instances/INSTANCE constraints/compute.vmExternalIpAccess So you can indeed choose with instances have public ips https://cloud.google.com/resource-manager/docs/organization-policy/org-policy-constraints#constraints-for-specific-services Define allowed external IPs for VM instances

   Source: Adapted from community discussion — fad3r

   References

   • Google Cloud documentation

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6. Question 276 · 356 in bank

   Select 2

   Which two security characteristics are related to the use of VPC peering to connect two VPC networks? (Choose two.)

   • ACentral management of routes, firewalls, and VPNs for peered networks
   • BNon-transitive peered networks; where only directly peered networks can communicate
   • CAbility to peer networks that belong to different Google Cloud organizations
   • DFirewall rules that can be created with a tag from one peered network to another peered network
   • EAbility to share specific subnets across peered networks

   Show answer

   Answer: BC

   Explanation

   B. Non-transitive peered networks; where only directly peered networks can communicate C. Ability to peer networks that belong to different Google Cloud Platform organizations

   Source: Adapted from community discussion — AwesomeGCP

   References

   • Google Cloud documentation

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7. Question 277 · 356 in bank

   A patch for a vulnerability has been released, and a DevOps team needs to update their running containers in Google Kubernetes Engine (GKE). How should the DevOps team accomplish this?

   • AUse Puppet or Chef to push out the patch to the running container.
   • BVerify that auto upgrade is enabled; if so, Google will upgrade the nodes in a GKE cluster.
   • CUpdate the application code or apply a patch, build a new image, and redeploy it.
   • DConfigure containers to automatically upgrade when the base image is available in Container Registry.

   Show answer

   Answer: C

   Explanation

   https://cloud.google.com/containers/security Containers are meant to be immutable, so you deploy a new image in order to make changes. You can simplify patch management by rebuilding your images regularly, so the patch is picked up the next time a container is deployed. Get the full picture of your environment with regular image security reviews. C is better

   Source: Adapted from community discussion — TNT87

   References

   • Google Cloud documentation
   • Google Cloud documentation
   • Google Cloud documentation
   • Google Cloud documentation

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8. Question 278 · 356 in bank

   A customer needs to launch a 3-tier internal web application on Google Cloud Platform (GCP). The customer's internal compliance requirements dictate that end- user access may only be allowed if the traffic seems to originate from a specific known good CIDR. The customer accepts the risk that their application will only have SYN flood DDoS protection. They want to use GCP's native SYN flood protection. Which product should be used to meet these requirements?

   • ACloud Armor
   • BVPC Firewall Rules
   • CCloud Identity and Access Management
   • DCloud CDN

   Show answer

   Answer: B

   Explanation

   See here: https://cloud.google.com/files/GCPDDoSprotection-04122016.pdf DDoS Protection by enabling Proxy-based Load Balancing ○ When you enable HTTP(S) Load Balancing or SSL proxy Load Balancing, Google infrastructure mitigates and absorbs many Layer 4 and below attacks, such as SYN floods, IP fragment floods, port exhaustion, etc. ○ If you have HTTP(S) Load Balancing with instances in multiple regions, you are able to disperse your attack across instances around the globe.

   Source: Adapted from community discussion — Jeanphi72

   References

   • Google Cloud documentation
   • Google Cloud documentation

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9. Question 279 · 356 in bank

   A company is running their webshop on Google Kubernetes Engine and wants to analyze customer transactions in BigQuery. You need to ensure that no credit card numbers are stored in BigQuery What should you do?

   • ACreate a BigQuery view with regular expressions matching credit card numbers to query and delete affected rows.
   • BUse the Cloud Data Loss Prevention API to redact related infoTypes before data is ingested into BigQuery.
   • CLeverage Security Command Center to scan for the assets of type Credit Card Number in BigQuery.
   • DEnable Cloud Identity-Aware Proxy to filter out credit card numbers before storing the logs in BigQuery.

   Show answer

   Answer: B

   Explanation

   "B" A and C are reactive measures. D is not related to hiding sensitive information. B is the only pro-active/preventative measure specific to hiding sensitive information. https://cloud.google.com/bigquery/docs/scan-with-dlp

   Source: Adapted from community discussion — [Removed]

   References

   • Google Cloud documentation

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10. Question 280 · 356 in bank

    A customer wants to deploy a large number of 3-tier web applications on Compute Engine. How should the customer ensure authenticated network separation between the different tiers of the application?

    • ARun each tier in its own Project, and segregate using Project labels.
    • BRun each tier with a different Service Account (SA), and use SA-based firewall rules.
    • CRun each tier in its own subnet, and use subnet-based firewall rules.
    • DRun each tier with its own VM tags, and use tag-based firewall rules.

    Show answer

    Answer: B

    Explanation

    Answer is B. Keyword is 'authenticated". Reference below: "Isolate VMs using service accounts when possible" "even though it is possible to uses tags for target filtering in this manner, we recommend that you use service accounts where possible. Target tags are not access-controlled and can be changed by someone with the instanceAdmin role while VMs are in service. Service accounts are access-controlled, meaning that a specific user must be explicitly authorized to use a service account. There can only be one service account per instance, whereas there can be multiple tags. Also, service accounts assigned to a VM can only be changed when the VM is stopped." https://cloud.google.com/solutions/best-practices-vpc-design#isolate-vms-service-accounts

    Source: Adapted from community discussion — genesis3k

    References

    • Google Cloud documentation
    • Google Cloud documentation
    • Google Cloud documentation
    • Google Cloud documentation

    Next question

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PCSE practice, question 271. 356 questions available.