VPC Service Controls in GCP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of VPC Service Controls in Google Cloud?

VPC Service Controls help protect sensitive data by creating a security perimeter around Google Cloud services to prevent data exfiltration.

beginner

How does VPC Service Controls restrict access to Google Cloud services?

It restricts access by defining service perimeters that limit which resources and users can communicate with protected services based on network boundaries.

intermediate

What is a service perimeter in VPC Service Controls?

A service perimeter is a virtual boundary that defines which Google Cloud resources are protected and controls data communication across that boundary.

intermediate

Can VPC Service Controls protect data from being accessed by users outside the perimeter even if they have valid credentials?

Yes, VPC Service Controls enforce access restrictions based on network location, so even valid credentials cannot access data outside the perimeter.

beginner

Name two Google Cloud services commonly protected by VPC Service Controls.

BigQuery and Cloud Storage are commonly protected services to prevent data exfiltration.

What does a VPC Service Controls perimeter primarily protect against?

A Billing fraud

B Unauthorized VM creation

C Data exfiltration from Google Cloud services

D Network latency issues

VPC Service Controls create a security boundary to prevent data exfiltration from protected services.

Which of the following is true about VPC Service Controls?

A They manage DNS settings

B They replace IAM roles

C They encrypt data at rest

D They restrict access based on network boundaries

VPC Service Controls restrict access by defining network-based service perimeters.

If a user has valid credentials but is outside the service perimeter, can they access protected data?

A Only during business hours

B No, access is blocked by the perimeter

C Yes, credentials override perimeter

D Only if using VPN

VPC Service Controls block access based on network location even if credentials are valid.

Which Google Cloud service is NOT typically protected by VPC Service Controls?

A Cloud DNS

B BigQuery

C Cloud Functions

D Cloud Storage

Cloud DNS is not typically protected by VPC Service Controls as it is a global service outside the perimeter scope.

What is required to create a service perimeter in VPC Service Controls?

A Select Google Cloud projects and services to protect

B Create firewall rules

C Enable Cloud Armor

D Configure IAM policies only

Service perimeters are created by selecting projects and services to include within the protected boundary.

Explain how VPC Service Controls help protect sensitive data in Google Cloud.

Think about how a fence protects a garden by keeping things inside safe.

Describe what a service perimeter is and how it works in VPC Service Controls.

Imagine a fence around a playground that only lets certain people in.

Practice

1. What is the main purpose of VPC Service Controls in Google Cloud?

easy

A. To manage user identities and access permissions

B. To create a secure boundary around cloud services to protect data

C. To automatically back up data to multiple regions

D. To increase the speed of network traffic between services

Solution

1. Step 1: Understand the role of VPC Service Controls

   VPC Service Controls create a security perimeter around Google Cloud services to protect sensitive data from unauthorized access.

2. Step 2: Compare with other options

   Options A, B, and C describe different Google Cloud features unrelated to VPC Service Controls.

3. Final Answer:

   To create a secure boundary around cloud services to protect data -> Option B

4. Quick Check:

   VPC Service Controls = Secure boundary [OK]

Hint: VPC Service Controls protect data by creating security boundaries [OK]

Common Mistakes:

• Confusing VPC Service Controls with identity management
• Thinking it speeds up network traffic
• Assuming it handles backups automatically

2. Which of the following is the correct way to define a VPC Service Controls perimeter in a YAML configuration?

easy

A. perimeterType: 'NETWORK_PERIMETER'
resources:
- projects/project-123
restrictedServices:
- storage.googleapis.com
enforce: true

B. perimeterType: 'SERVICE_PERIMETER'
resources:
- projects/project-123
restrictedServices:
- storage.googleapis.com
allowAll: true

C. perimeterType: 'SERVICE_PERIMETER'
resources:
- projects/project-123
restrictedServices:
- compute.googleapis.com
enforce: false

D. perimeterType: 'SERVICE_PERIMETER'
resources:
- projects/project-123
restrictedServices:
- storage.googleapis.com
enforce: true

Solution

1. Step 1: Identify correct perimeter type and enforcement

   VPC Service Controls use 'SERVICE_PERIMETER' as perimeterType and enforce true to activate restrictions.

2. Step 2: Check restricted services and resource format

   Restricted services should list Google Cloud APIs like storage.googleapis.com, and resources should be project IDs.

3. Final Answer:

   perimeterType: 'SERVICE_PERIMETER' with enforce: true and correct resources -> Option D

4. Quick Check:

   Correct perimeterType and enforce true = perimeterType: 'SERVICE_PERIMETER' resources: - projects/project-123 restrictedServices: - storage.googleapis.com enforce: true [OK]

Hint: SERVICE_PERIMETER with enforce: true is required for VPC SC [OK]

Common Mistakes:

• Using NETWORK_PERIMETER instead of SERVICE_PERIMETER
• Setting enforce to false disables the perimeter
• Using allowAll instead of enforce

3. Given this VPC Service Controls perimeter configuration:

perimeterType: 'SERVICE_PERIMETER'
resources:
  - projects/project-abc
restrictedServices:
  - storage.googleapis.com
  - bigquery.googleapis.com
enforce: true

What happens if a VM in project-abc tries to access compute.googleapis.com?

medium

A. Access is allowed only if the VM has special IAM roles

B. Access is denied because all services are blocked inside the perimeter

C. Access is allowed because compute.googleapis.com is not restricted

D. Access is denied because compute.googleapis.com is implicitly restricted

Solution

1. Step 1: Understand restricted services in the perimeter

   The perimeter restricts only storage.googleapis.com and bigquery.googleapis.com.

2. Step 2: Check access to compute.googleapis.com

   Since compute.googleapis.com is not listed, access is allowed by default.

3. Final Answer:

   Access is allowed because compute.googleapis.com is not restricted -> Option C

4. Quick Check:

   Only listed services are restricted = Access is allowed because compute.googleapis.com is not restricted [OK]

Hint: Only services listed in restrictedServices are blocked [OK]

Common Mistakes:

• Assuming all services are blocked inside perimeter
• Thinking IAM roles override perimeter restrictions
• Believing unlisted services are implicitly blocked

4. You configured a VPC Service Controls perimeter but users report they cannot access Cloud Storage from inside the perimeter. Which of the following is the most likely cause?

medium

A. The perimeter's restrictedServices includes storage.googleapis.com and enforce is set to true

B. The perimeter is missing storage.googleapis.com in restrictedServices

C. The perimeter's enforce is set to false

D. The perimeter uses NETWORK_PERIMETER instead of SERVICE_PERIMETER

Solution

1. Step 1: Analyze the effect of restrictedServices and enforce

   If storage.googleapis.com is in restrictedServices and enforce is true, access to Cloud Storage is blocked inside the perimeter.

2. Step 2: Evaluate other options

   Missing storage.googleapis.com or enforce false would allow access; NETWORK_PERIMETER is invalid for VPC SC.

3. Final Answer:

   restrictedServices includes storage.googleapis.com and enforce is true -> Option A

4. Quick Check:

   Restricted service + enforce true blocks access [OK]

Hint: Restricted service with enforce true blocks access inside perimeter [OK]

Common Mistakes:

• Thinking missing restrictedServices blocks access
• Assuming enforce false blocks access
• Confusing NETWORK_PERIMETER with SERVICE_PERIMETER

5. Your company wants to protect sensitive data in BigQuery and Cloud Storage using VPC Service Controls. You have two projects: project-secure and project-public. You want to allow project-public to access BigQuery but not Cloud Storage inside the perimeter. How should you configure the perimeter?

hard

A. Include both projects in resources, restrict only storage.googleapis.com

B. Include only project-secure in resources, restrict both storage.googleapis.com and bigquery.googleapis.com

C. Include both projects in resources, restrict both storage.googleapis.com and bigquery.googleapis.com

D. Include only project-public in resources, restrict storage.googleapis.com

Solution

1. Step 1: Determine which projects to include in the perimeter

   To protect data in both projects but allow project-public access to BigQuery, include both projects in the perimeter.

2. Step 2: Set restricted services to block only Cloud Storage

   Restrict storage.googleapis.com to block Cloud Storage access, but do not restrict bigquery.googleapis.com to allow BigQuery access from project-public.

3. Final Answer:

   Include both projects and restrict only storage.googleapis.com -> Option A

4. Quick Check:

   Both projects + restrict storage only = Include both projects in resources, restrict only storage.googleapis.com [OK]

Hint: Restrict only storage to block Cloud Storage, include both projects [OK]

Common Mistakes:

• Restricting both services blocks BigQuery access
• Including only one project limits protection
• Restricting BigQuery when access is needed