The process of automatically installing and configuring plugins during Jenkins setup is known as Bootstrapping. It ensures that the required plugins are set up and ready for use.

Large-scale Jenkins projects often require the use of Pipeline plugins. Pipelines allow for defining complex build and deployment workflows as code, offering enhanced functionality and flexibility.

"Encryption" in Jenkins is crucial for ensuring secure communication and data transfer in a distributed architecture. It protects sensitive information from unauthorized access during transmission.

Configuring user authentication in Jenkins is primarily aimed at restricting access based on user roles. This ensures that users have appropriate permissions and can only perform authorized actions.

The Jenkins Scripted API, often written in Groovy, is used for managing plugins programmatically. It allows users to script various actions related to plugin management.

Setting up Jenkins Plugins is a key consideration for a large-scale project requiring integration with multiple external tools. Jenkins Plugins extend the functionality of Jenkins by providing integrations with various tools and technologies.

The Configuration as Code (CasC) plugin is commonly used in Jenkins for managing job configurations through code, enhancing version control and traceability.

Jenkins supports integration with LDAP (Lightweight Directory Access Protocol) systems to enhance security by allowing user authentication through external directories.

Automated testing in Jenkins pipelines primarily aims to verify code changes for regressions, ensuring that new updates do not introduce unintended issues to the existing codebase.

Advanced Jenkins users may implement Master-Slave clustering to optimize load distribution and efficiency. This setup involves a central master node managing multiple agent nodes, enabling parallel execution of jobs on different machines.