Jenkins Jenkins Agents and Distributed Builds

Question 1

What is a Jenkins agent (formerly called slave)?

Accepted Answer

A machine that connects to the Jenkins controller to run build jobs

Answer

A secondary Jenkins controller

Answer

A plugin that orchestrates parallel builds

Answer

A Docker container running the Jenkins server

Question 2

What protocol does Jenkins use by default to communicate with agents?

Accepted Answer

JNLP/Remoting protocol (TCP)

Answer

SSH

Answer

WebSocket

Answer

REST over HTTP

Question 3

What is a Jenkins label used for in relation to agents?

Accepted Answer

Associating jobs or pipeline stages with specific agents or agent groups that have matching labels

Answer

Naming build artifacts

Answer

Tagging source code commits

Answer

Identifying plugin versions

Question 4

What does the `agent { label 'linux' }` directive do in a Declarative Pipeline?

Accepted Answer

Runs the pipeline on any agent with the 'linux' label

Answer

Installs the Linux OS on a new agent

Answer

Creates a new Docker agent named linux

Answer

Restricts the pipeline to run only on the controller

Question 5

What is the Jenkins agent.jar (remoting.jar) file?

Accepted Answer

The Java executable that runs on the agent machine and communicates with the controller

Answer

The Jenkins war file

Answer

A plugin for agent management

Answer

The Jenkins CLI client

Question 6

Which agent connection method allows Jenkins to initiate the connection to the agent via SSH?

Accepted Answer

SSH Build Agents (Launch via SSH)

Answer

JNLP inbound agent

Answer

WebSocket agent

Answer

Cloud agent