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Juniper JN0-106 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Networking Fundamentals: Covers core networking concepts including IP addressing, subnetting, Layer 2
  • 3 operations, routing basics, and protocol types essential for understanding how networks function.
Topic 2
  • User Interfaces: Covers how to navigate and use the Junos CLI and J-Web interface, including configuration management, output filtering, and working with active versus candidate configurations.
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.
Topic 4
  • 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 5
  • Configuration Basics: Covers the essential steps for configuring a Junos device from factory default, including user accounts, interfaces, authentication, system services like NTP and SNMP, and configuration archival.
Topic 6
  • 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.

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q20-Q25):

NEW QUESTION # 20
Which rollback command reverts the device to the configuration that was active before the most recent commit?

Answer: A

Explanation:
Rollback 0 refers to the currently active configuration, while rollback 1 refers to the configuration that was active immediately before the last commit.


NEW QUESTION # 21
Which Junos OS automation tool allows programmatic access to configuration and operational data using XML-based remote procedure calls?

Answer: D

Explanation:
NETCONF is a network management protocol that uses XML-encoded remote procedure calls (RPCs) to allow programmatic retrieval and modification of a Junos device's configuration and operational state, commonly used for automation and orchestration.


NEW QUESTION # 22
Which two components are included in a transport header? (Choose two.)

Answer: A,D

Explanation:
The transport layer in the OSI model is responsible for end-to-end communication and error recovery. In a transport header, such as TCP or UDP, the key components include the source port number and the destination port number. These port numbers are used to identify sending and receiving applications. The source port number indicates the port of the sending application, and the destination port number refers to the port of the receiving application. MAC addresses, on the other hand, are part of the data link layer (Layer 2) and would be included in an Ethernet header, not a transport header.


NEW QUESTION # 23

Referring to the exhibit, you are configuring a Junos router to provide connectivity to a building across town on the network 10.10.10.0/24. The next-hop router is at 10.10.1.1, which is reachable using interface ge-0/0/1.
After committing the configuration in the exhibit, users report they still cannot reach the 10.10.10.0/24 network, and the route does not appear as active in the routing table. In this scenario, which statement is correct?

Answer: B

Explanation:
In Junos OS, the Routing Engine (RE) performs a validation check on every entry in the Routing Information Base (RIB). For a static route to be considered valid and transition to an active state in the inet.0 table, its designated next hop must be resolvable . A next-hop address is resolvable only if the router has an existing route (typically a directly connected route) to that specific IP address.
According to the exhibit, the static route for 10.10.10.0/24 has been configured with a next hop of 10.1.1.1 .
However, the scenario states that the actual gateway router is located at 10.10.1.1 . If the local interface (ge-0
/0/1) is configured with an IP in the 10.10.1.0/x subnet, the router will have a direct route to 10.10.1.1, but it will likely have no path to the 10.1.1.1 address provided in the exhibit.
Because the router cannot resolve the next hop 10.1.1.1 , the static route is placed in an " inactive " or " hidden " state. It will not be installed in the forwarding table pushed to the Packet Forwarding Engine (PFE), and standard show route commands will not display it unless specific flags like hidden or all are used. This logic ensures that the router does not attempt to forward packets into a " black hole " where the gateway is logically unreachable. To fix this, the administrator must modify the configuration to point to the correct, reachable next-hop address of 10.10.1.1.
Reference: Routing Fundamentals, Static Route Resolution, and Troubleshooting Routing Tables.


NEW QUESTION # 24
You successfully committed a configuration change. You now realize an issue exists and must revert back to the previous configuration. Which command entered in configuration mode will accomplish this task when committed?

Answer: A

Explanation:
Junos OS features a sophisticated configuration management system that automatically creates a snapshot of the active configuration every time a commit is successfully performed. These snapshots are stored as rollback files in a historical archive. Within the configuration mode hierarchy, the rollback command allows an administrator to discard current candidate changes and load a previously committed configuration into the candidate buffer.
The numbering of these rollback files is sequential and follows a specific logic: rollback 0 represents the configuration that is currently active and running on the system. To revert to the state that existed immediately prior to the most recent commit, the administrator must use rollback 1. This command overwrites the current candidate configuration with the previous operational state. It is important to note that executing rollback 1 does not immediately impact the running system; it merely populates the candidate database. The changes must still be verified-often using show | compare-and then finalized by executing the commit command.
By default, Junos maintains up to 50 of these rollback configurations (and up to 100 on certain platforms
/versions), providing a robust safety net for operational recovery and auditing. Reference: Configuration Basics, Managing Configurations, Rollback configurations.


NEW QUESTION # 25
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