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Juniper JN0-106 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Junos OS Fundamentals: Covers the architecture of Junos OS, focusing on the separation of control and forwarding planes and how traffic is processed by the routing and packet-forwarding engines.
Topic 2
  • Routing Fundamentals: Covers core routing concepts on Junos devices, including routing and forwarding tables, route preference, static routing, routing instances, and an introduction to dynamic routing protocols.
Topic 3
  • Routing Policy and Firewall Filters: Covers how to control traffic flow on Junos devices using routing policies and firewall filters, including policy structure, match criteria, filter actions, and unicast RPF.

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q48-Q53):

NEW QUESTION # 48
You want to automatically back up your Junos device configuration to an external server every time you commit a configuration change. In this scenario, which command would accomplish this task?

Answer: A

Explanation:
Junos OS provides robust automation features for configuration management, specifically through the system archival utility. When an administrator needs to ensure that every successful configuration change is mirrored to an off-box repository for disaster recovery or auditing, the transfer-on-commit statement is the appropriate tool. This command instructs the Junos device to initiate an automated upload process immediately following the validation and activation of a commit command.
To fully implement this, the administrator must also define the archive-sites, which specify the destination URIs (using protocols such as FTP, SCP, or HTTP) and the necessary credentials for the external server.
While transfer-interval can be used to back up configurations on a chronological schedule (e.g., every 60 minutes), transfer-on-commit is superior for tracking specific change events as they happen. This ensures that the external backup is always synchronized with the current active configuration on the device. Once configured, the device handles the background transfer, allowing the administrator to maintain a historical record of configuration states without manual intervention, which is essential for large-scale operational environments.
Reference: Configuration Basics, Managing Configurations, System Archival.


NEW QUESTION # 49
Click the Exhibit button.

Which command displays the output in the format shown in the exhibit?

Answer: B

Explanation:
The exhibit illustrates a Junos configuration rendered as a sequence of flat, executable lines that each begin with the set keyword. This is commonly referred to as the " set format. " By default, Junos OS displays the configuration in a hierarchical, brace-delimited format (often called " staza " or " curly brace " format). While the default format is excellent for visualizing the structural relationship between different configuration objects, the set format is often preferred for documentation, scripting, or copying specific configuration snippets between different devices.
To produce the output seen in the exhibit, an administrator must append the pipe filter | display set to the show configuration command. This filter instructs the CLI parser to flatten the hierarchical structure and prepend the necessary context to every individual leaf statement. These lines are highly functional because they can be pasted directly into the CLI of another device while in configuration mode to recreate the exact settings. In contrast, display inheritance is used to reveal hidden settings applied via configuration groups, and display detail provides additional technical metadata about the objects. Neither of those options would transform the output into the discrete set command lines shown in the exhibit. Understanding how to toggle between these display formats is a fundamental skill for any architect managing Junos infrastructures through the Command Line Interface.
Reference: User Interfaces, Configuration Display Options, display set.


NEW QUESTION # 50
Which layer of the OSI model contains the IP address information?

Answer: B

Explanation:
The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions in seven distinct layers. IP (Internet Protocol) addresses are part of Layer 3, known as the Network Layer. This layer is responsible for packet forwarding, including routing through intermediate routers, and it handles the logical addressing scheme of the network to ensure that packets can be routed across multiple networks and reach their destination. IP addresses provide unique identifiers for network interfaces, allowing for communication between devices on a network or across different networks.


NEW QUESTION # 51
Which two statements about route preference in Junos OS are correct? (Choose two.)

Answer: A,B

Explanation:
In Junos OS, route preference (often referred to as administrative distance in other operating systems) is the mechanism used to select the " best " path when the routing table receives multiple advertisements for the exact same destination prefix from different routing sources. The core rule for preference is that lower values indicate a more preferred or " higher priority " route . For example, a direct route has a default preference of 0, a static route is 5, and OSPF internal routes are 10. If a router learns about the same network from both OSPF and a static entry, it will select the static route because 5 is lower than 10.
Crucially, route preference is only evaluated after the longest prefix match (LPM) has been determined.
LPM is the absolute first step in packet forwarding; the router will always choose the most specific route available (e.g., a /28 over a /24). Only if there are multiple entries for that same /28 does the router look at preference to break the tie. It is a common misconception that a lower preference value can override a more specific prefix; in reality, a /32 route with a preference of 170 (BGP) will always win over a /24 route with a preference of 5 (Static). Understanding this hierarchy is vital for network architects when designing redundant paths and predictable failover behaviors.


NEW QUESTION # 52
Which two statements describe rollback configuration behavior in Junos OS? (Choose two.)

Answer: C,D

Explanation:
Junos OS incorporates a robust configuration versioning and recovery system designed to protect against configuration errors and human oversight. A key feature of this system is that rollback files are stored automatically by the device after each successful commit. These files represent a historical record of previous active configurations. By default, the system maintains a set number of these files, allowing an administrator to revert to a previous state (e.g., rollback 1) if the most recent changes result in unexpected network instability.
Another critical safety mechanism is the behavior associated with the commit confirmed command. If an administrator issues this command but fails to provide a subsequent confirmation within a designated timeframe (defaulting to 10 minutes), the system assumes a loss of management connectivity. Consequently, the rollback configurations are applied automatically after the commit confirmed timeout to restore the previous known-good state. This is an essential best practice for remote configuration management. It is important to note that rollback 0 refers to the currently active configuration, not the factory default, and that while Junos supports maintaining a large number of rollback files, the primary operational benefit lies in the automated storage and confirmation-based recovery processes that ensure the device remains reachable and stable. Reference: Configuration Basics, Rollback Configurations, Commit Confirmed Logic.


NEW QUESTION # 53
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