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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Junos, Associate (JNCIA-Junos) |
| Exam Number: | JN0-106 |
| Available Languages: | English |
| Exam Format: | Multiple choice |
| Exam Duration: | 90 minutes |
| Passing Score: | 60% - 70% (scaled scoring, exact value not published) |
| Exam Price: | $200 USD |
| Certificate Validity Period: | 3 years |
| Related Certifications: | JNCIE-SP JNCIS-ENT JNCIP-SP JNCIP-ENT JNCIS-SP JNCIE-ENT |
| Real Exam Qty: | 65 |
| Recommended Training: | Getting Started with Networking Introduction to Junos OS |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-106 Sample Questions |
| Exam Way: | Online (OnVUE) or onsite at Pearson VUE test centers |
| Pre Condition: | No prerequisites required |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/tracks/junos/jncia-junos.html |
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NEW QUESTION # 33
Exhibit:
Referring to the exhibit, which route will be selected for a packet destined to IP address 10.50.10.55?
Answer: B
Explanation:
In Junos OS, the Routing Information Base (RIB) selection process follows a strict hierarchy where the Longest Prefix Match (LPM) is the absolute primary tie-breaker. When a packet is destined for 10.50.10.55
, the Routing Engine searches the inet.0 table for all matching entries. In this exhibit, four routes match: the default route ( 0.0.0.0/0 ), a general static route ( 10.0.0.0/8 ), an OSPF route ( 10.50.0.0/16 ), and a BGP route ( 10.50.10.0/24 ).
The LPM rule dictates that the router must select the most specific route available, which is defined as the entry with the highest number of matching bits in the subnet mask. The 10.50.10.0/24 route matches 24 bits of the destination address, making it more specific than the 16-bit, 8-bit, or 0-bit alternatives. It is critical to understand that route preference (e.g., Static at 5, OSPF at 10, or BGP at 170) is only evaluated if there are multiple paths to the exact same prefix and length. Because these prefixes vary in length, the length takes precedence over the protocol preference. Therefore, the BGP-learned route via 192.168.1.20 is selected as the active path, ensuring traffic follows the most granular routing information provided to the device. Reference:
Routing Fundamentals, Routing Table Selection, Longest Prefix Match.
NEW QUESTION # 34
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
Answer: B
NEW QUESTION # 35
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: D
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 # 36
A network administrator must set up the initial configuration of the out-of-band management interface on a new Juniper router to ensure management traffic is isolated from the default routing table (inet.0). In this scenario, which configuration step is required to accomplish this task in Junos OS?
Answer: B
Explanation:
In modern Junos OS versions, the most efficient and standard way to isolate Out-of-Band (OOB) management traffic from transit traffic is by utilizing the management-instance . Historically, management interfaces like fxp0 (on M/MX/T series) or me0 (on EX/QFX series) shared the global routing table (inet.0), which could lead to routing conflicts if management subnets overlapped with production data.
To resolve this, Junos introduced the set system management-instance command. When this is enabled, the OS automatically creates a dedicated routing instance named mgmt_junos. The physical management interface (be it fxp0, em0, or me0) and its associated logical unit are moved into this private instance. This creates a complete separation: management protocols like SSH, SNMP, and NTP operate within mgmt_junos, while BGP, OSPF, and customer data remain in inet.0. This architecture ensures that even a massive routing loop or table exhaustion in the production plane will not prevent an administrator from accessing the device via the OOB port. Furthermore, it simplifies the configuration of default gateways for management traffic, as the mgmt_junos instance maintains its own independent routing table (mgmt_junos.inet.0), preventing management routes from ever being leaked into the provider core.
Reference: Operational Monitoring and Maintenance, Management Instance, OOB Management.
NEW QUESTION # 37
What is the primary purpose of an IPv6 link-local address?
Answer: C
Explanation:
IPv6 link-local addresses, which are identified by the fe80::/10 prefix, are a mandatory component of the IPv6 architecture. The primary purpose of a link-local address is to enable immediate communication between devices located on the same local network segment (the same " link " ) without the requirement for a global unicast address or an external routing infrastructure. These addresses are non-routable, meaning they are never forwarded by a router to another network segment.
Every IPv6-enabled interface on a Junos device automatically generates a link-local address, typically derived from the interface ' s MAC address using the EUI-64 format or a stable privacy algorithm. These addresses are essential for several core functions: they are used by the Neighbor Discovery Protocol (NDP) to resolve MAC addresses, they serve as the source address for routing protocol adjacency formation (such as OSPFv3 or RIPng), and they are frequently used as the next-hop address in IPv6 routing tables. While they do not provide Layer 2 connectivity themselves (which is the role of the MAC address), they provide the necessary Layer 3 link-level presence required for nodes to discover one another and communicate across the physical medium before any global addressing is configured.
Reference: Networking Fundamentals, IPv6 Addressing and Link-Local Scope.
NEW QUESTION # 38
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