Home > Latest News > Configuration Basics: Key Knowledge Areas for JNCIA-Junos JN0-105 Exam

ALL IT Certifications

Configuration Basics: Key Knowledge Areas for JNCIA-Junos JN0-105 Exam

June 29,2024

Successfully passing the Junos, Associate (JNCIA-Junos) JN0-105 exam requires a solid understanding of Configuration Basics. This article aims to help candidates master this critical topic by providing a detailed overview of the essential elements for configuring Junos devices. We will cover each key component and provide practical examples and explanations to enhance your knowledge. Additionally, Passcert collected JNCIA-Junos JN0-105 practice questions with detailed explanations will help you solidify your understanding and prepare effectively for the exam.

Configuration Basics

1. Factory-Default State

Definition: The factory-default state is the original configuration of the device when it is shipped. It includes the minimal configuration necessary to bring up the system.

Command: request system zeroize (resets the device to its factory-default state by removing all configuration files, log files, and other system data).

2. Initial Configuration

Steps: Includes setting the root password, hostname, and basic interface settings.

Commands:

configure (enters configuration mode)

set system root-authentication plain-text-password (sets the root password)

set system host-name <hostname> (sets the device hostname)

set interfaces <interface> unit 0 family inet address <IP-address> (configures an interface)

3. User Accounts

Commands:

set system login user <username> class <class> authentication plain-text-password (creates a user with a specified login class)

set system login user <username> full-name "<full name>" (adds a full name to the user account)

4. Login Classes

Definition: Login classes define user permissions and access privileges.

Commands:

set system login class <class-name> permissions <permissions> (defines permissions for a login class)

set system login user <username> class <class-name> (assigns a login class to a user)

5. User Authentication Methods

Methods: Include local password, SSH keys, RADIUS, and TACACS+.

Commands:

set system authentication-order [password radius tacplus] (sets the order of authentication methods)

6. Interface Types and Properties

Types: Ethernet, SONET/SDH, T1/E1, etc.

Commands:

set interfaces <interface> description "<description>" (adds a description to an interface)

set interfaces <interface> unit 0 family inet address <IP-address> (configures the IP address for an interface)

7. Configuration Groups

Definition: Configuration groups allow you to apply common configurations to multiple parts of the system.

Commands:

set groups <group-name> <configuration> (creates a configuration group)

set apply-groups <group-name> (applies a configuration group)

8. Additional Initial Configuration Elements

NTP: set system ntp server <NTP-server>

SNMP: set snmp community <community-name> authorization read-only

System Log: set system syslog file <filename> any <log-level>

9. Configuration Archival

Commands:

set system archival configuration transfer-on-commit (enables configuration archival on commit)

set system archival configuration archive-sites <URL> (defines where to archive configurations)

10. Logging and Tracing

Commands:

set system syslog file <filename> any <log-level> (sets logging levels)

set system traceoptions flag all (enables tracing options)

11. Rescue Configuration

Definition: A known good configuration that can be loaded in case of configuration errors.

Command: request system configuration rescue save (saves the current configuration as the rescue configuration)

JNCIA-Junos JN0-105 Practice Questions with Explanations

Real-time Usage Statistics for Busiest Interfaces

You are asked to view the real-time usage statistics for the busiest interfaces on a device running Junos OS. Which command will achieve this task?

A. monitor traffic absolute-sequence

B. monitor interface traffic

C. monitor traffic

D. show interfaces extensive

Answer: B

Explanation: The monitor interface traffic command is used to display real-time statistics for traffic on interfaces.

Device that Uses Destination IP to Forward Packets

Which type of device uses the destination IP address to forward packets?

A. Layer 3 router

B. Layer 2 switch

C. repeater

D. hub

Answer: A

Explanation: A Layer 3 router uses the destination IP address in the packet header to make forwarding decisions.

Routing Tables and Forwarding Tables

When considering routing tables and forwarding tables, which two statements are correct? (Choose two.)

A. The routing table is used by the RE to select the best route.

B. The forwarding table stores all routes and prefixes from all protocols.

C. The forwarding table is used by the RE to select the best route.

D. The routing table stores all routes and prefixes from all protocols.

Answer: A and D

Explanation: The routing table is used by the Routing Engine (RE) to select the best route and stores all routes and prefixes learned from various protocols.

Request System Configuration Rescue Save Command

What will the request system configuration rescue save command do?

A. It saves the most recently committed configuration as the rescue configuration.

B. It saves the candidate configuration as the rescue configuration.

C. It saves a configuration version prior to the configuration most recently committed as the rescue configuration.

D. It activates the rescue configuration.

Answer: A

Explanation: This command saves the current, active configuration as the rescue configuration.

Addresses in Ethernet Frame Header

Which two addresses are included in an Ethernet frame header? (Choose two.)

A. source IP address

B. source MAC address

C. destination IP address

D. destination MAC address

Answer: B and D

Explanation: An Ethernet frame header contains the source and destination MAC addresses.

Components in a Transport Header

Which two components are included in a transport header? (Choose two.)

A. destination port number

B. source MAC address

C. source port number

D. destination MAC address

Answer: A and C

Explanation: The transport header (TCP/UDP) includes the source and destination port numbers.

Advantages of Using Junos OS

What are two advantages of using the Junos OS? (Choose two.)

A. It enables you to roll back to a previous configuration.

B. It pushes your configuration changes "live" immediately.

C. It is modular.

D. It supports up to a maximum of two previous configurations.

Answer: A and C

Explanation: Junos OS allows you to roll back to previous configurations and has a modular architecture.

Protocol for Learning IPv4 Neighbor's MAC Address

Which protocol is responsible for learning an IPv4 neighbor's MAC address?

A. Address Resolution Protocol (ARP)

B. Network Address Translation (NAT)

C. Media Access Control Security (MACsec)

D. Neighbor Discovery Protocol (NDP)

Answer: A

Explanation: ARP is used to map IPv4 addresses to MAC addresses.

Junos OS Component for Maintaining Forwarding Table

Which Junos OS component is responsible for maintaining the forwarding table?

A. Routing Engine

B. chassis control daemon

C. Packet Forwarding Engine

D. management daemon

Answer: C

Explanation: The Packet Forwarding Engine (PFE) maintains the forwarding table and forwards packets based on its entries.

By understanding these configuration basics and practicing with the provided questions, you will be well-equipped to tackle the JNCIA-Junos exam. This guide not only helps you grasp the fundamental concepts but also prepares you to apply your knowledge effectively, ensuring a smoother and more confident exam experience.

Related Suggestion: Junos, Associate (JNCIA-Junos) JN0-105 Dumps Replacement of JN0-104 Exam February 01,2024; Data Center, Associate (JNCIA-DC) JN0-281 Dumps December 04,2024; Data Center, Professional (JNCIP-DC) JN0-683 Dumps September 09,2024; Security, Professional (JNCIP-SEC) JN0-637 Dumps July 09,2024; Mist AI, Associate (JNCIA-MistAI) JN0-252 Dumps June 07,2024; Mist AI Wired, Specialist (JNCIS-MistAI-Wired) JN0-460 Dumps April 15,2024; Data Center, Associate (JNCIA-DC) JN0-280 Dumps March 29,2024; Design, Associate (JNCIA-Design) JN0-1103 Dumps January 29,2024; New Cloud, Associate (JNCIA-Cloud) JN0-214 Dumps January 24,2024; Data Center, Specialist (JNCIS-DC) JN0-480 Dumps January 17,2024; Cloud, Specialist (JNCIS-Cloud) JN0-413 Dumps August 30,2023; Automation and DevOps, Associate (JNCIA-DevOps) JN0-223 Dumps August 28,2023; Cloud, Associate (JNCIA-Cloud) JN0-213 Dumps May 22,2023; Service Provider Professional (JNCIP-SP) JN0-664 Dumps April 17,2023; Security, Specialist (JNCIS-SEC) JN0-335 Dumps January 18,2023; Mist AI, Specialist (JNCIS-MistAI) JN0-451 Dumps January 14,2023; Mist AI - Associate (JNCIA-MistAI) JN0-251 Dumps January 12,2023; Security,Professional (JNCIP-SEC) JN0-636 Dumps December 17,2022; Juniper JNCIS-SP Certification JN0-363 Exam Dumps Available November 24,2022; Juniper JNCIP-ENT JN0-649 Dumps - Enterprise Routing and Switching, Professional November 09,2022; Security, Associate (JNCIA-SEC) JN0-231 Dumps May 07,2022; 2022 Update JN0-104 Junos, Associate (JNCIA-Junos) Exam Dumps March 29,2022; Mist AI, Associate (JNCIA-MistAI) JN0-250 Dumps November 12,2021; Mist AI, Specialist (JNCIS-MistAI) JN0-450 Dumps October 28,2021; Junos, Associate (JNCIA-Junos) JN0-104 Dumps Replacement of JN0-103 Exam October 25,2021; Automation and DevOps, Associate (JNCIA-DevOps) JN0-222 Dumps Replacement of JN0-221 Exam August 26,2021; Cloud, Professional (JNCIP-Cloud) JN0-611 Dumps August 25,2021; JNCDS-SP Certification JN0-1362 Dumps - Service Provider Design, Specialist (JNCDS-SP) August 24,2021; 2021 Juniper JNCDS-DC JN0-1302 Dumps - Data Center Design, Specialist (JNCDS-DC) May 10,2021; JNCIS-SP Certification JN0-362 Dumps - Service Provider Routing and Switching, Specialist (JNCIS-SP) January 15,2021; Design, Associate (JNCDA) JN0-1102 Dumps Replacement of JN0-1101 Exam January 08,2021; Cloud, Professional (JNCIP-Cloud) JN0-610 Dumps December 23,2020; JNCIP-SP Exam JN0-663 Dumps - Service Provider Routing and Switching, Professional (JNCIP-SP) December 07,2020; Security, Professional (JNCIP-SEC) JN0-635 Dumps Available November 21,2020; JNCDS-SP Exam JN0-1361 Dumps - Service Provider Design, Specialist (JNCDS-SP) November 18,2020; JNCIA-DevOps Exam JN0-221 Dumps Available Replacement of JN0-220 Exam October 23,2020; 2020 New Cloud, Associate (JNCIA-Cloud) JN0-211 Dumps September 29,2020; JNCIA-DevOps Exam JN0-221 Dumps - New Automation and DevOps, Associate Exam September 17,2020; Juniper JNCIP-ENT JN0-648 Dumps - New Enterprise Routing and Switching, Professional Exam August 20,2020; Security, Associate (JNCIA-SEC) JN0-230 Exam Dumps July 13,2020; JNCIS-Cloud Exam JN0-412 Dumps - Juniper Cloud, Specialist Exam June 03,2020; Security, Professional (JNCIP-SEC) JN0-634 Dumps September 05,2019; Juniper JNCIS-SEC JN0-333 Dumps - Security, Specialist (JNCIS-SEC) July 10,2019; New Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Dumps Replacement of JN0-349 Exam August 22,2023; JNCIS-DevOps Certification JN0-422 Dumps Replacement of JN0-421 Exam March 14,2022; Data Center, Professional (JNCIP-DC) JN0-682 Dumps Replacement of JN0-681 Exam February 28,2022; Cloud, Associate (JNCIA-Cloud) JN0-212 Dumps Replacement of JN0-211 Exam February 26,2022; New Security, Associate (JNCIA-SEC) JN0-231 Exam Available Replacement of JN0-230 January 10,2022; New JNCIS-ENT JN0-349 Dumps Replacement of JN0-348 Exam October 11,2021; Security Design, Specialist (JNCDS-SEC) JN0-1332 Dumps August 19,2021; New Junos, Associate (JNCIA-Junos) Exam JN0-103 Dumps June 09,2020; [JN0-210 Retired] New JNCIA-Cloud JN0-211 Exam Available December 31,2019; JNCIS-DevOps Exam JN0-421 Dumps - Automation and DevOps, Specialist September 20,2019; New JNCIS-SEC Exam JN0-334 Dumps - Security, Specialist JN0-333 Was Retired September 18,2019; New Data Center, Professional (JNCIP-DC) JN0-681 Dumps - JN0-680 Retired September 04,2019; Differences between JN0-348 and JN0-347 Exams May 03,2019; Juniper JNCDA JN0-1101 Exam Dumps - Design, Associate (JNCDA) April 29,2019; How to pass Juniper JNCIA-DevOps JN0-220 exam successfully? January 29,2019; 2019 Valid Juniper JNCIP-ENT JN0-647 dumps, JN0-647 Practice Test Questions January 13,2019; Juniper JNCIS-ENT JN0-347 dumps - JN0-347 pdf with free JN0-347 software November 27,2018; Juniper JN0-662 exam dumps, JNCIP-SP Certification JN0-662 questions August 15,2018; Juniper JN0-210 Cloud, Associate (JNCIA-Cloud) dumps available March 01,2018; 2018 JNCIS-SP JN0-361 Service Provider Routing and Switching, Specialist Exam dumps February 08,2018; 2018 Valid Juniper JNCIA-Junos JN0-102 dumps pdf May 28,2018