Decrease Latency for Asian Users

B.

Based on the scenario described, users in Asia are experiencing high latency when accessing a web application hosted in the us-central1 region. A network load balancer has already been configured, but it has not improved the performance. To decrease the latency, the following options are given:

A. Configure a policy-based route rule to prioritize the traffic: Policy-based routing (PBR) allows you to prioritize traffic based on specific policies or criteria, such as source IP address, destination IP address, protocol type, etc. This can help to improve the performance of the application by directing traffic to the most appropriate path. However, this option assumes that there are multiple paths available, which is not mentioned in the scenario. Therefore, this option is less likely to be the correct solution.

B. Configure an HTTP load balancer, and direct the traffic to it: An HTTP load balancer is designed specifically for distributing traffic for web applications. This option is a good solution as it can help to improve the performance of the application by distributing traffic across multiple servers, reducing the load on each server, and improving response times. By directing traffic to the HTTP load balancer, it can distribute traffic to the most optimal server, which can help to decrease latency for users in Asia.

C. Configure Dynamic Routing for the subnet hosting the application: Dynamic routing protocols, such as BGP or OSPF, can help to improve network performance by automatically discovering the most efficient path for traffic. However, this option is less likely to be the correct solution since the scenario does not mention any specific routing issues, and it is unclear how configuring dynamic routing for the subnet would help to decrease latency for users in Asia.

D. Configure the TTL for the DNS zone to decrease the time between updates: The TTL (Time To Live) for a DNS record determines how long a DNS resolver should cache the record before it expires and needs to be refreshed. Configuring a lower TTL can help to decrease the time between updates, allowing changes to propagate more quickly across the network. However, this option is less likely to be the correct solution since it does not address the underlying issue of high latency for users in Asia.

Therefore, the most appropriate solution to decrease the latency for users in Asia would be to configure an HTTP load balancer and direct traffic to it.