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Juniper JN0-106 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Junos OS Fundamentals20%- Traffic processing
  • 1. Transit and exception traffic flow
  • 2. Packet handling and forwarding logic
- Software versions and upgrades
  • 1. Junos OS release types
  • 2. Upgrade and downgrade procedures
- Junos architecture
  • 1. Routing Engine and Packet Forwarding Engine
  • 2. Control and forwarding planes
Topic 2: Routing Policy and Firewall Filters10%- Routing policy
  • 1. Policy structure, terms, match conditions and actions
  • 2. Policy application and flow control
- Firewall filters
  • 1. Filter structure, match conditions and actions
  • 2. Filter processing and reverse path forwarding
Topic 3: User Interfaces15%- Other management interfaces
  • 1. NETCONF, SSH and out-of-band management
  • 2. J-Web GUI overview
- Command Line Interface (CLI)
  • 1. Command syntax, help and filtering
  • 2. Operational and configuration modes
Topic 4: Routing Fundamentals10%- Static and dynamic routing
  • 1. OSPF, RIP and BGP basics
  • 2. Static routes and qualified next hops
- Routing concepts
  • 1. Longest match routing and administrative distance
  • 2. Routing tables and route sources
Topic 5: Operational Monitoring and Maintenance15%- Monitoring commands
  • 1. Show commands for system, interfaces and routing
  • 2. Logging, tracing and troubleshooting tools
- System maintenance
  • 1. Password recovery and system recovery
  • 2. File management and storage monitoring
Topic 6: Configuration Basics15%- Commit and rollback operations
  • 1. Rollback and rescue configuration
  • 2. Commit, commit-check, commit-confirmed
- Basic system configuration
  • 1. User authentication and permissions
  • 2. Hostname, domain name and name servers
- Configuration management
  • 1. Hierarchy structure and configuration modes
  • 2. Candidate, active and factory-default configurations
Topic 7: Networking Fundamentals15%- Networking concepts and models
  • 1. Collision and broadcast domains
  • 2. TCP/IP suite and protocol functions
- Ethernet and switching fundamentals
  • 1. Switching operations and VLAN concepts
  • 2. MAC addressing and frame processing
- IP addressing and subnetting
  • 1. Subnetting, supernetting and route summarization
  • 2. IPv4 and IPv6 addressing

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q23-Q28):

NEW QUESTION # 23
Which command is used to enter configuration mode from operational mode?

Answer: A

Explanation:
The configure command transitions the CLI from operational mode into configuration mode, allowing changes to the candidate configuration.


NEW QUESTION # 24
Which two traffic types are processed by a Routing Engine using Junos OS? (Choose two.)

Answer: B,C

Explanation:
The Routing Engine (RE) in a Junos device serves as the centralized intelligence and management hub, primarily responsible for the control and management planes of the system. In this capacity, the RE is tasked with processing routing updates, such as OSPF Link State Advertisements (LSAs) or BGP Update messages. These updates are vital for the RE to maintain the Routing Information Base (RIB), calculate the shortest paths, and subsequently populate the Forwarding Information Base (FIB) which is then pushed to the Packet Forwarding Engine (PFE).
Furthermore, the Routing Engine handles all local management traffic. This category encompasses administrative access through the Command Line Interface (CLI) via SSH or Telnet, SNMP queries from network management systems, and system logging processes.
Because the RE runs the Junos OS kernel, it must directly interpret and respond to these management-level requests to ensure the device remains configurable and observable.
Conversely, transit traffic--the data passing through the device from one ingress port to an egress port--is offloaded to the PFE to be handled at wire speed. While the PFE manages the heavy lifting of data forwarding and Class of Service (CoS) application, the RE remains focused on high- level protocol maintenance and system administration, ensuring that control plane stability is maintained even under heavy traffic loads.


NEW QUESTION # 25
Click the Exhibit button.

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

Answer: A

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 # 26
Which two statements are true about the firewall filter configuration shown in the exhibit? (Choose two.)

Answer: B,D

Explanation:
The exhibit illustrates the configuration of a firewall filter named mgmt_fill and its subsequent application to an interface. The first true statement is that the filter is applied to a physical interface . The configuration shows the filter attached to me0 , which in Junos nomenclature represents the Management Ethernet port-a dedicated physical port for out-of-band management traffic. This is separate from logical or virtual interfaces, as me0 provides the physical link for administrative access.
The second true statement is that the filter evaluates SSH packets egressing from the management interface . In the provided snippet, term t1 specifically matches the destination-port ssh , and the filter is applied to the interface unit. When a filter is applied to an interface, it can monitor traffic entering or leaving the device. Furthermore, the filter utilizes a count action (count c1), which is a non-terminating action used to provide telemetry on specific traffic types passing through that physical port. There is no mention of a syslog or log action in the configuration, meaning that while packets are counted, they are not being written to the system log files. This configuration is a standard method for hardening the management plane and tracking administrative session activity on the Routing Engine. Reference: Routing Policy and Firewall Filters, Firewall Filter Actions, Management Interfaces.


NEW QUESTION # 27
Which two actions happen when multiple users issue the configure exclusive command to enter configuration mode on a Junos device? (Choose two.)

Answer: A,C

Explanation:
Other users can enter and exit configuration mode, but they cannot commit any changes they attempt to make to the configuration until it is unlocked.
One user locks the configuration and makes changes without interference from other users.
https://www.juniper.net/documentation/us/en/software/junos/cli/topics/topic-map/configure- command.html


NEW QUESTION # 28
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