JN0-105: Junos, Associate (JNCIA-Junos)
Exam Number: JN0-105
Exam Name: Junos, Associate (JNCIA-Junos)
Length of test: 60 mins
Exam Format: Multiple-choice, Drag and Drop, and HOTSPOT questions.
Exam Language: English
Number of questions in the actual exam: 65 questions
Passing Score: 70%
Topics Covered:
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Networking Fundamentals: Concepts and functionality of various fundamental elements of networking, such as collision domains, broadcast domains, routers, switches, Ethernet networks, Layer 2 and Layer 3 addressing, subnetting, and supernetting.
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Junos OS Fundamentals: Core elements of the Junos OS, including software architecture, control and forwarding planes, routing engine, packet-forwarding engine, transit traffic processing, exception traffic, and user interfaces.
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User Interfaces: Concepts, operation, and functionality of the Junos user interface, including CLI functionality, CLI modes, CLI navigation, CLI Help, filtering output, active vs. candidate configuration, and J-Web.
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Configuration Basics: Main elements for configuring Junos devices, such as factory-default state, initial configuration, user accounts, login classes, user authentication methods, interface types and properties, configuration groups, and additional initial configuration elements.
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Operational Monitoring and Maintenance: Methods of monitoring or maintaining Junos devices, including show commands, monitor commands, interface statistics and errors, network tools (ping, traceroute, telnet, SSH), Junos OS installation and upgrades, powering on and shutting down Junos devices, and root password recovery.
This study guide should help you understand what to expect on the JN0-105 exam and includes a summary of the topics the exam might cover and links to additional resources. The information and materials in this document should help you focus your studies as you prepare for the exam.
Related questions
After the factory default configuration is loaded, which configuration object must be created prior to the first commit?
Which two statements apply to the Routing Engine functions? (Choose two.)
What are two benefits when implementing class of service? (Choose two.)
Implementing Class of Service (CoS) in a network provides numerous benefits, particularly in managing traffic based on its importance, source, or type. CoS enables network administrators to manage traffic congestion by applying various queuing techniques and policies to ensure that critical services remain unaffected during high congestion periods. Additionally, CoS allows for the prioritization of latency-sensitive traffic such as voice and video, ensuring that these services maintain quality despite varying network conditions.
Which two statements about route preference in Junos are correct? (Choose two.)
In Junos OS, route preference (also known as administrative distance) is used to determine the preferred route among multiple routes to the same destination learned via different routing protocols. Direct and local routes, which represent directly connected networks and interfaces, typically share the same low preference value, indicating high trustworthiness because they are directly connected to the router. OSPF internal routes (routes within the same OSPF area) and OSPF AS external routes (routes that are external to the OSPF autonomous system but redistributed into OSPF) also share the same preference value, although this value is higher (indicating less trust) than for direct and local routes. This distinction helps the routing engine decide which routes to use when multiple paths are available.
Which two statements are true about the candidate configuration? (Choose two.)
The candidate configuration in Junos OS is a temporary configuration that allows network administrators to make and stage multiple configuration changes before applying them to the device. This approach enables the deployment of multiple changes in a single operation, ensuring that all configurations work together as intended before making them active. Additionally, the candidate configuration can be discarded if the administrator decides not to apply the staged changes, allowing for a 'trial and error' approach without affecting the currently active configuration. This feature provides flexibility and reduces the risk of disruptive changes to the network.
Which two functions are performed by the PFE? (Choose two.)
What are two physical interface properties? (Choose two.)
Which two statements are true about the Junos OS? (Choose two.)
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
The firewall filter configuration in the exhibit specifies a filter with two terms. Term 1 matches traffic from the source address 10.0.0.0/8 and has two actions: 'log' and 'next term'. The 'log' action will record the match to a log file, and 'next term' indicates that the firewall should evaluate the next term after logging. There is no explicit action such as 'accept' or 'reject' in term 1, so by default, the traffic will be accepted unless subsequently rejected by another term.
Term 2 has the action 'reject', which discards packets that reach this term. Since there is no 'from' condition in term 2, it acts as a default rule for all traffic not matched by term 1.
Because the traffic sourced from 10.0.0.0/8 matches term 1 and there is no reject action in that term, it will be logged and then accepted by the firewall filter. There is no subsequent term that rejects this specific traffic, so the action from term 2 does not apply to it.
What is the maximum number of rollback configuration files that the Junos OS will store?
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