JN0-105 Exam Preparation Material | Junos, Associate (JNCIA-Junos)

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Prepare for the JN0-105 Junos, Associate (JNCIA-Junos) exam with CertQueen's independently developed study resources. Review important concepts, practice scenario-based questions, and use clear explanations to identify areas that require further study.

Question#1

Exhibit
{hold:node0}[edit]
root# set system root-authentication ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups encrypted-password Encrypted password string
load-key-file File (URL) containing one or more ssh keys
plain-text-password Prompt for plain text password (autoencrypted) > ssh-dsa Secure shell (ssh) DSA public key string
> ssh-rsa Secure shell (ssh) RSA public key string {hold:node0}[edit]
root# set system root-authentication plain-text-password New password:
Retype new password:
{hold:node0}[edit]
root# commit and-quit
[edit interfaces]
'ge-0/0/0'
HA management port cannot be configured error: configuration check-out failed
{hold:node0}[edit]
root#
You are unable to remotely access your Juniper device using the CLI.
Referring to the exhibit, which command would you add to the existing configuration to enable remote CLI access?

A. load factory-default

B. set system root-authentication plain-text-password

C. set system services ssh

D. set system login idle-timeout 20

Explanation:
In Junos OS, remote access to the device's CLI is commonly facilitated through Secure Shell (SSH), a protocol providing secure command-line access over an insecure network. The given exhibit indicates an attempt to set a root authentication password but does not show configuration for enabling remote access services. To enable SSH, which is not shown in the configuration snippet, you need to configure the device to accept SSH connections. This is done by enabling the SSH service within the system services hierarchy of the configuration. The correct command to add to the existing configuration for enabling remote CLI access via SSH is set system services ssh. This command activates the SSH service, allowing secure remote logins to the device.

Question#2

Which process in the Junos OS is responsible for maintaining routing protocols and tables?

A. mgd

B. chassisd

C. rpd

D. dcd

Explanation:
The Routing Protocol Daemon (rpd) in Junos OS is responsible for maintaining routing protocols and tables. It handles all routing information, including the calculation of routes and the population of the routing table, making it crucial for dynamic routing operations.

Question#3

What is the protocol data unit (PDU) of the Data Link Layer?

A. segment

B. byte

C. frame

D. bit

Explanation:
In the OSI model, the Data Link Layer is responsible for node-to-node delivery of data. It frames the packets received from the Network Layer and prepares them for physical transmission. The Protocol Data Unit (PDU) for the Data Link Layer is called a "frame." Frames encapsulate the network layer packets, adding a header and a trailer that include the hardware addresses of the source and destination, among other things, facilitating the data link layer services like frame synchronization, flow control, and error checking.

Question#4

Exhibit
user@router> show route 192.168.100.2
inet.O: 15 destinations, 17 routes (15 active, 0 holddown, 0 hidden) Limit/Threshold:
1048576/1048576 destinations
+ = Active Route, - = Last Active, * = Both 192.168.100.2/32 *[OSPF/IO] 00:14:29, metric 1
> to 172.16.1.6 via ge-0/0/1.0 [BGP/170] 00:06:49, localpref 100
AS path: 65102 I, validation-state: unverified > to 172.16.1.6 via ge-0/0/1.0
Referring to the exhibit, which statement is correct?

A. The BGP path is the only active route.

B. The BGP route is preferred over the OSPF route.

C. The OSPF path is the only active route.

D. / Traffic is load-balanced across two routes.

Explanation:
Referring to the exhibit, the presence of the "+" symbol next to the OSPF route for 192.168.100.2/32 indicates that this is the active route being used to forward traffic. The BGP route, although present, does not have the "+" symbol, indicating it is not the active route. In Junos OS, the routing table displays the active route with a "+" symbol, and the fact that the OSPF route has this symbol means it is the preferred path based on the routing protocol's decision process, which takes into account factors such as route preference (administrative distance) and metrics.

Question#5

Which two statements are correct about MAC addresses? (Choose two.)

A. Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.

B. The source and destination MAC addresses always remains static to the final destination.

C. The MAC address identifies the physical hardware.

D. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.

Explanation:
MAC (Media Access Control) addresses are unique identifiers assigned to network interfaces for communications at the data link layer of a network segment. MAC addresses are used to identify the physical hardware on a network. In the context of Ethernet switches, the destination MAC address in incoming frames is used to determine the appropriate output port for forwarding the frame towards its final destination. The switch does not change the destination MAC address; it uses the MAC address to make forwarding decisions within the local network segment.

Exam Code: JN0-105
Q & A: 111 Q&As Updated: Oct 28,2026

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Review Key Concepts

Review the technologies, products, processes, and practical skills covered by the current JN0-105 exam objectives.

Practice Scenario-Based Questions

Work through independently developed questions designed to strengthen your understanding of technical scenarios and decision-making.

Identify Knowledge Gaps

Use your results and the provided explanations to find weaker areas and focus your study more effectively.

How to Use This JN0-105 Preparation Material

Review the Exam Scope

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Complete a focused set of practice questions for each topic. On your first attempt, avoid referring to notes, answers, or other study resources so that you can evaluate your current understanding more accurately.

Study the Explanations

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Close Knowledge Gaps

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Exam Code: JN0-105
Q & A: 111 Q&As
Updated: Oct 28,2026

Access Complete JN0-105 Preparation Material