Junos OS

Question 1

What is Junos OS?

Answer 1

Junos OS is the network operating system used by Juniper Networks devices, based on FreeBSD and designed for reliability and scalability.

Question 2

Which language is used for configuration in Junos OS?

Answer 2

Junos OS uses a configuration language based on Juniper’s own syntax, resembling a hierarchical, structured configuration model.

Question 3

What is the role of the “root” user in Junos OS?

Answer 3

The root user has full administrative privileges to configure and manage Junos OS.

Question 4

How do you upgrade Junos OS on a device?

Answer 4

You can upgrade Junos OS using the “request system software add” command followed by the path to the software package.

Question 5

What is the function of the “commit” command in Junos OS?

Answer 5

The “commit” command applies configuration changes to the device, making them active.

Question 6

How do you view the current system configuration in Junos OS?

Answer 6

You can use the “show configuration” command to view the current system configuration.

Question 7

What does the “rollback” command do in Junos OS?

Answer 7

The “rollback” command restores a previous configuration file, allowing you to revert changes.

Question 8

How do you configure interfaces in Junos OS?

Answer 8

Interfaces are configured using the “set interfaces” command, followed by the interface name and parameters.

Question 9

What is Junos OS’s default login method for device access?

Answer 9

The default login method is via SSH or console access, depending on the configuration.

Question 10

What is the difference between “configure” and “operational” mode in Junos OS?

Answer 10

“Configure” mode is used for making configuration changes, while “operational” mode is used for monitoring and troubleshooting.

Question 11

How can you verify system uptime in Junos OS?

Answer 11

Use the “show system uptime” command to check the system’s uptime.

Question 12

What command is used to check the system’s disk space in Junos OS?

Answer 12

Use the “show system storage” command to view disk usage and available space.

Question 13

How does Junos OS handle software packages?

Answer 13

Junos OS allows you to install, remove, and manage software packages using commands like “request system software add” and “request system software delete.”

Question 14

How can you monitor active sessions in Junos OS?

Answer 14

You can monitor active sessions using the “show system connections” command.

Question 15

What is the function of the “commit check” command in Junos OS?

Answer 15

The “commit check” command validates the configuration for errors before committing changes.

Question 16

How do you configure routing protocols in Junos OS?

Answer 16

Routing protocols are configured using the “set protocols” command, followed by the desired protocol.

Question 17

What does the “show version” command do in Junos OS?

Answer 17

The “show version” command displays information about the system’s hardware and software version.

Question 18

What is the purpose of the “security” stanza in Junos OS?

Answer 18

The “security” stanza is used to configure security policies, VPNs, and firewall settings.

Question 19

What is the Junos OS CLI’s “pipe” symbol used for?

Answer 19

The “pipe” symbol (|) is used to filter and manipulate command output in the CLI.

Question 20

How can you restart a service in Junos OS?

Answer 20

Use the “restart” command followed by the service name to restart a service in Junos OS.