Juniper JNCIA exam cram and study notes.

1. Juniper JUNOS software architecture

The Juniper JUNOS software architecture is a modular and scalable architecture that provides a high-performance, secure, and flexible platform for building and operating network devices such as routers and switches.

The JUNOS software architecture consists of several main components, including the following:

1. 1. Kernel: The JUNOS kernel is the core of the operating system and provides low-level services such as process and memory management, device management, and network stack support.

2. 2. Routing Engine (RE): The Routing Engine is responsible for the control plane functions of the JUNOS software, including routing protocol processing, firewall filtering, policy enforcement, and other control-plane functions.

3. 3. Forwarding Engine (FE): The Forwarding Engine is responsible for the data plane functions of the JUNOS software, including packet forwarding, Quality of Service (QoS), and other data-plane functions.

Check out the full article at

 https://www.tutorialsweb.com/networking/Junos/fundamentals/index.htm

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Juniper JNCIA Practice Questions with Answers and Explanation (Sample only)

1. The Junos Kernel is based on the _______

(Choose one suitable answer listed below)

A. IBM AIX operating system.

B. Xenix operating system.

C. FreeBSD UNIX operating system

D. Solaris Operating System

Answer: D

Explanation:

The Junos OS is based on an open source operating system- FreeBSD UNIX. The

open source nature of FreeBSD helped in customizing to another level of special

application. Thus, the simplicity and innovation made Junos OS the most unique.

Objective: Junos OS Fundamentals

Difficulty: Beginner

2. What is the command used when upgrading the current software on juniper device?

A. request system software install

B. set system software replace

C. set system soft upgrade

D. request system software add

Answer: D

Explanation:

We use “request system software add” command to install the new software on our

Junos devices. Once the complete installation is done, a reboot is required to apply

the changes on our junos devices.

Objective:

Operational Monitoring and Maintenance

Difficulty: Intermediate

3. What is the command used in Junos devices to verify whether or not the telnet service is

enabled?

A. root@firewall# show system services

B. root@firewall > show configuration services

C. root@firewall # show telnet

500. root@firewall # show telnet services

Ans. A

Explanation:

All the services that are enabled on our Junos devices can be verified using ‘show system services’ command.

Objective: Operational Monitoring and Maintenance

Difficulty: Beginner

4. Which class permission of login allows a user to use the ssh utility?

A. Bash permission

B. Root permission

C. Network permission

D. Shell permission

Answer: C

Explanation:

Services such as telnet, ssh, ftp, etc. are allowed using network login class permission.

Objective: Operational Monitoring and Maintenance

Difficulty: Beginner

5. Which statement is correct regarding the password-recovery process on junos devices?

A. A console connection is required

B. You cannot set the console port to an insecure mode.

C. You must press the shift key to boot into single-user mode

D. Password can be recovered without console connection

Answer: A

Explanation: In order to recover our junos devices password, a console connection is required.

Without the console connection, password recovery is impossible.

Objective: Operational Monitoring and Maintenance

Difficulty: Beginner

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