Cloud VPN for hybrid connectivity in GCP - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Architecture

intermediate

Understanding Cloud VPN Tunnel Behavior

You have set up a Cloud VPN tunnel between your on-premises network and Google Cloud. The tunnel is configured but the traffic is not passing through. Which of the following is the most likely reason?

A The on-premises firewall is blocking all outbound traffic.

B The Cloud VPN service is not enabled in the Google Cloud project.

C The Cloud VPN tunnel uses a deprecated protocol that is no longer supported.

D The VPN tunnel is up but the routing is not configured to send traffic through the tunnel.

💡 Hint

Check if the routes are properly set to send traffic through the VPN tunnel.

Even if the VPN tunnel is established, traffic will not flow unless routing is configured to direct traffic through the tunnel. The other options are less likely because the VPN service must be enabled to create the tunnel, and the protocol used is supported. Firewall blocking outbound traffic would prevent tunnel establishment.

❓ security

intermediate

Cloud VPN Encryption Protocols

Which encryption protocol does Google Cloud VPN use to secure data in transit between your on-premises network and Google Cloud?

A IPsec (Internet Protocol Security)

B SSL/TLS (Secure Sockets Layer / Transport Layer Security)

C SSH (Secure Shell)

D FTP over TLS

💡 Hint

Think about protocols designed specifically for network layer encryption.

Google Cloud VPN uses IPsec to encrypt data between your on-premises network and Google Cloud. SSL/TLS is used for web traffic security, SSH is for secure shell access, and FTP over TLS is for file transfers.

❓ service_behavior

advanced

Behavior of HA VPN with Multiple Interfaces

You configure an HA VPN gateway with two interfaces in Google Cloud. What happens if one interface fails?

A Traffic is load balanced equally between the two interfaces regardless of failure.

B The entire VPN gateway stops working until the failed interface is fixed.

C Traffic automatically fails over to the other interface without interruption.

D You must manually switch traffic to the working interface.

💡 Hint

Consider how high availability is designed to handle failures.

HA VPN gateways are designed with redundancy. If one interface fails, traffic automatically fails over to the other interface to maintain connectivity without manual intervention.

❓ Configuration

advanced

Configuring Routes for Cloud VPN

You want to configure a Cloud VPN tunnel using dynamic routing with BGP. Which of the following must you configure on the Google Cloud side?

A Manually add static routes to the VPN tunnel without using Cloud Router.

B Create a Cloud Router and attach it to the VPN gateway to manage BGP sessions.

C Enable VPC Flow Logs on the subnet connected to the VPN gateway.

D Configure firewall rules to allow ICMP traffic only.

💡 Hint

Dynamic routing with BGP requires a routing component to exchange routes.

To use dynamic routing with BGP on Cloud VPN, you must create a Cloud Router and attach it to the VPN gateway. This allows automatic route exchange. Static routes do not support dynamic BGP, and enabling flow logs or ICMP rules does not configure routing.

✅ Best Practice

expert

Optimizing Cloud VPN for High Throughput

You need to maximize throughput for your Cloud VPN connection between your data center and Google Cloud. Which approach is best?

A Use an HA VPN gateway with multiple tunnels and interfaces to aggregate bandwidth.

B Use a single Classic VPN tunnel with the highest MTU setting possible.

C Disable encryption to reduce overhead and increase speed.

D Use static routing instead of dynamic routing to reduce processing.

💡 Hint

Think about redundancy and parallelism to increase throughput.

HA VPN gateways support multiple tunnels and interfaces, allowing traffic to be spread across them to increase total throughput. Using a single tunnel limits bandwidth. Disabling encryption is not supported and reduces security. Routing type does not significantly affect throughput.