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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | JNCIA-Junos (Junos, Associate) Exam |
| Exam Number: | JN0-106 |
| Certificate Validity Period: | 3 years |
| Passing Score: | Approximately 60β70% (exact score not publicly fixed) |
| Exam Format: | Scenario-based questions, Multiple choice |
| Available Languages: | English |
| Related Certifications: | JNCIP-Junos JNCIE-Junos JNCIS-Junos |
| Exam Price: | $200 USD (may vary by region) |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | Approximately 65 multiple-choice questions |
| Recommended Training: | Juniper Day One Books (Junos Fundamentals) Juniper Official JNCIA-Junos Training |
| Exam Registration: | Juniper Certification Portal Pearson VUE Exam Registration |
| Sample Questions: | Juniper JN0-106 Sample Questions |
| Exam Way: | Computer-based testing at authorized testing centers or online proctored exam (availability may vary by region). |
| Pre Condition: | No formal prerequisites required; basic networking knowledge recommended. |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/certification-tracks/junos-certification-track.html |
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NEW QUESTION # 55
You manage a Junos device with 20 interfaces. Each interface requires the same description and MTU setting. Which configuration approach would reduce repetitive commands and ensure consistency?
Answer: C
Explanation:
A configuration group allows you to define common settings once and apply them to multiple interfaces, ensuring consistency and reducing repetitive configuration.
NEW QUESTION # 56
You committed a new configuration on a Junos router, but users report connectivity issues. You must quickly restore the previous working configuration without manually editing the candidate configuration. Which command should you use to load the required configuration into the candidate configuration?
Answer: C
Explanation:
In Junos OS, the configuration database is designed with a robust versioning system that facilitates rapid recovery from administrative errors. Every time a commit command is successfully executed, the system automatically archives the previous active configuration and assigns it a " rollback " index. The rollback command is used within configuration mode to revert the candidate configuration to a previously saved state.
The indices are zero-based, where rollback 0 represents the currently active configuration that was just committed. To restore the configuration that was functional immediately before the most recent, problematic commit, the administrator must use rollback 1. This command replaces the current candidate configuration with the contents of the last known working state. It is important to note that executing rollback 1 only populates the candidate buffer; to make this previous configuration active and restore connectivity, the administrator must subsequently issue the commit command. This mechanism is a cornerstone of Junos OS ' s commitment to high availability and operational resilience, allowing for nearly instantaneous restoration of services without the need for manual line-by-line configuration edits during a network outage.
Reference: Configuration Basics, Managing Configurations, Rollback configurations.
NEW QUESTION # 57
Which statement is correct when Router R1 receives a packet from User A destined for User B as shown in the exhibit?
Answer: D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From: In a routed environment like the one shown in the exhibit, traffic forwarding involves a constant interaction between Layer 3 (Network) and Layer
2 (Data Link) addressing. When User A generates a packet destined for User B, the source and destination IP addresses remain static throughout the entire journey across the network (assuming no Network Address Translation is performed). However, the Layer 2 Ethernet headers must be rewritten at every hop because MAC addresses have only local significance on a physical segment.
As Router R1 receives the packet from User A, it performs a lookup in its Forwarding Information Base (FIB) and identifies that the path to User B requires forwarding the packet to Router R2. R1 decapsulates the incoming frame, stripping away the original Ethernet header that contained User A ' s source MAC and R1 ' s own destination MAC. To forward the packet to the next hop, R1 creates a new Ethernet header. The source MAC address becomes the MAC address of R1's egress interface, and the destination MAC address is replaced with the MAC address of Router R2 . R1 cannot use User B ' s MAC address at this point because User B is not on a directly connected segment. This hop-by-hop MAC address replacement is essential for the Packet Forwarding Engine to successfully deliver the frame to the next Layer 3 device in the path. Reference:
Networking Fundamentals, Packet Forwarding, Layer 2 and Layer 3 Addressing.
NEW QUESTION # 58
What information does the forwarding table require so that the device forwards traffic? (Choose three.)
Answer: B,D,E
Explanation:
The forwarding table in a network device requires specific information to efficiently forward traffic toward its destination. This includes the next hop IP address, which indicates the next router or device in the path to the destination. The outgoing interface name identifies the physical or logical interface through which the packet should be sent to reach the next hop. Lastly, the next hop MAC address is crucial for Layer 2 forwarding decisions, allowing the device to encapsulate the IP packet in a frame that can be understood by Ethernet or other Layer 2 protocols. OSPF metric values and BGP local preference values are used in the routing decision process to select the best path and populate the forwarding table but are not directly used by the forwarding table to forward traffic.
NEW QUESTION # 59
Which two functions are performed by the PFE? (Choose two.)
Answer: A,D
Explanation:
The Packet Forwarding Engine (PFE) represents the data plane of a Junos device, responsible for the high- speed processing and movement of packets through the system. Its primary role is to forward transit traffic- data that enters one interface and exits another-at wire speed using specialized hardware such as Application- Specific Integrated Circuits (ASICs). To accomplish this, the PFE utilizes a local copy of the Forwarding Information Base (FIB) provided by the Routing Engine, ensuring that forwarding decisions are made locally without requiring the main CPU ' s intervention for every packet.
In addition to pure forwarding, the PFE is the functional component that implements and executes firewall filters and policing. Because firewall filters must be applied to transit traffic at line rate to prevent bottlenecks, the PFE evaluates incoming and outgoing packets against configured filter terms in hardware. This ensures that security policies and traffic shaping are applied with minimal latency. It is critical to note that the PFE does not maintain the master routing table (RIB) or perform route selection; those " intelligent " control plane functions are strictly the domain of the Routing Engine. By offloading the repetitive tasks of packet inspection and hardware forwarding to the PFE, Junos OS maintains consistent performance even under heavy traffic loads or complex security configurations. Reference: Junos OS Fundamentals, Packet Forwarding Engine Architecture.
NEW QUESTION # 60
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