Exam Professional Cloud Developer topic 1 question 178 discussion

Answer B. Use Istio service mesh: Handles service communication Circuit breaking capability Retry policies Timeout management Fault tolerance

To use Istio to reduce latency in your microservices application, you would create a service mesh that includes the microservices on GKE and the on-premises services. Istio would then manage traffic between the microservices and the on-premises services, and would use its features to reduce latency.

Cloud Interconnect would be better option than C, I guess. Increase the VPN tunnels would provide the required bandwidth for the GCP and On-Premises services to communicate.

C for increase bandwidth

Istio can help to address the latency issues by creating a service mesh that allows you to control the flow of traffic between the microservices on GKE and the on-premises services. This can allow you to monitor and manage the traffic, as well as implement features such as load balancing and circuit breaking to help mitigate the impact of latency on the application. It also allows to increase the number of Cloud VPN tunnels for the connection between Google Cloud and the on-premises services, but it is not the best approach. Increasing the number of tunnels can help to increase the available bandwidth, but it does not address the underlying issues causing the latency. Decreasing the network layer packet size by decreasing the MTU value on Cloud VPN can cause fragmentation, which can increase latency, so it is not a good approach. Caching of PII data can be a good practice but it does not address the latency issues caused by fluctuating bandwidth.

It could be D. If you decrease the MTU, the packets get priority in FIFO queue of the routers.

Answer C. Take note the question is asking you to address a bandwidth issue, C is the most appropriate

C is the correct answer instead. https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies#more-bandwidth To increase the bandwidth of your HA VPN gateways, add more HA VPN tunnels.

A, B, and D can be eliminated A. Caching PII (Personally Identifiable Information) is never a good practice B. Using Istio is not going to improve the latency (the network hops remain the same) D. Reducing the packet size, has the effect of more packets being sent across which is counter productive That leaves C as the valid option GCP does support having multiple VPN Tunnels on the same gateway https://cloud.google.com/network-connectivity/docs/vpn/concepts/choosing-networks-routing#route-alignment

A is the answer.