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Juniper JN0-106 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 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
  • 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 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
  • 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.

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q10-Q15):

NEW QUESTION # 10
How are the Routing Engine and the Packet Forwarding Engine components connected?

Answer: D

Explanation:
The Routing Engine and Packet Forwarding Engine communicate over an internal Ethernet link, which is used to exchange control and forwarding information within the device.


NEW QUESTION # 11
Referring to the exhibit, with firewall filter Packet-Filter attached to an interface, if traffic is sent from 192.168.1.1 to 8.8.8.8 for a UDP DNS query, what will happen to the traffic?

Answer: A

Explanation:
Junos OS firewall filters operate on a first-match basis, evaluating terms sequentially from top to bottom. In this scenario, a UDP DNS packet (destination port 53) is sent from 192.168.1.1 to
8.8.8.8. Evaluation begins with term 1, which matches the correct source and destination IP addresses but specifies protocol tcp. Because the actual traffic uses UDP, term 1 is not a match.
Evaluation then moves to term 2. While term 2 correctly identifies protocol udp and port domain (port 53), it requires the source-address to reside within the 192.168.2.0/24 subnet. Since the source is 192.168.1.1, term 2 also fails to match.
When a packet fails to match any explicitly defined terms in a Junos firewall filter, it is subject to the implicit deny action. This default "last term" is a hardcoded safety mechanism that automatically discards all traffic that has not been explicitly permitted. Consequently, because neither term provides a match for the specific combination of source IP, protocol, and destination port, the DNS query is silently dropped by the Packet Forwarding Engine. This behavior ensures that Junos devices maintain a "deny-by-default" security posture, requiring administrators to define precise permit statements for all required transit or management traffic.


NEW QUESTION # 12
Which two statements describe rollback configuration behavior in Junos OS? (Choose two.)

Answer: B,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 # 13
Your routing policy has three terms. A route matches the first term with an accept action. In this scenario, what happens next?

Answer: D

Explanation:
Junos OS routing policies are evaluated using a sequential, " first-match " logic. When a route is compared against a policy, the system evaluates the terms in the order they are defined. Once a route meets all the match criteria (the from statement) in a term, the router executes the associated action (the then statement).
If the action is a terminating action -such as accept or reject-the evaluation of that specific route for that specific policy ends immediately. In this scenario, since the route matched the first term and the action was accept, the route is successfully processed and the policy evaluation is complete. The system will not proceed to evaluate the second or third terms. This behavior is critical for network architects to understand when ordering terms; more specific " exceptions " must be placed at the top of the policy, while broader " catch-all " terms must be placed at the bottom. If the administrator wanted the evaluation to continue to the next term despite a match, they would need to explicitly include the next term action, which is a non-terminating action.
Without it, a match on an accept action signifies the final decision for that route within that policy context.


NEW QUESTION # 14
What are two attributes of the UDP protocol? (Choose two.)

Answer: A,C

Explanation:
UDP (User Datagram Protocol) is known for being connectionless (D) and providing best-effort delivery without the reliability mechanisms present in TCP (C). This means that UDP does not establish a connection before sending data and does not guarantee delivery, order, or error checking, making it faster but less reliable than TCP.


NEW QUESTION # 15
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