What is a Cloud Router used for in Google Cloud?

A Cloud Router in Google Cloud is primarily used to dynamically manage route advertisements between a Virtual Private Cloud (VPC) network and on-premises networks or other VPCs. This is especially important in hybrid cloud environments where businesses need to maintain connectivity between their cloud resources and local data centers.

Cloud Router facilitates the exchange of routes using Border Gateway Protocol (BGP), enabling seamless and automated updates of the routing table without the need for manual configuration. This dynamic routing capability allows for better scalability and flexibility, ensuring that any changes in the network topology, such as adding or removing on-premises or cloud resources, can be managed efficiently.

By leveraging Cloud Router, network engineers can ensure that traffic is routed optimally, which helps maintain a stable and reliable network connection, especially in scenarios where multiple routes may be involved. This is crucial for performance and reliability in cloud architectures that require continuous and real-time data flow between different environments. The other options listed, such as managing access permissions, monitoring application logs, or controlling backup policies, involve different components and services within Google Cloud that do not pertain to the functionalities offered by Cloud Router.