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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Junos, Associate (JNCIA-Junos) |
| Exam Number: | JN0-106 |
| Exam Price: | $200 USD |
| Related Certifications: | JNCIP-ENT JNCIE-SP JNCIP-SP JNCIS-ENT JNCIE-ENT JNCIS-SP |
| Passing Score: | 60% - 70% (scaled scoring, exact value not published) |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple choice |
| Real Exam Qty: | 65 |
| Available Languages: | English |
| Certificate Validity Period: | 3 years |
| Recommended Training: | Introduction to Junos OS Getting Started with Networking |
| 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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32. Frage
Which two tasks are performed by the Routing Engine in a Junos device? (Choose two.)
Antwort: A,C
Begründung:
The Routing Engine (RE) functions as the centralized processor and administrative core of any Junos OS-based platform. Its primary responsibility involves the execution and maintenance of the control plane, which includes running all active routing protocols such as OSPF, BGP, and IS- IS. Through these protocols, the RE exchanges topology information with neighboring routers, builds the Routing Information Base (RIB), and calculates the optimal paths for traffic. Once these paths are determined, the RE distributes the resulting Forwarding Information Base (FIB) to the Packet Forwarding Engine (PFE) for hardware-level execution.
In addition to its protocol duties, the Routing Engine manages the device configuration and the overall system environment. This includes providing the user interface (CLI or J-Web), managing the candidate and active configuration databases, and handling the commit process. While the PFE is specifically designed to forward transit traffic and evaluate that traffic against firewall filters at line rate, the RE focuses on the higher-level logic and management tasks. This architectural separation ensures that management functions--such as a complex configuration commit or a protocol re-convergence event--do not degrade the performance of the data plane, allowing the device to continue forwarding user traffic without interruption.
33. Frage
You have configured some interfaces on a Junos device; however, you have not yet committed the configuration. What happens if you issue the rollback 0 command in this scenario?
Antwort: B
Begründung:
In Junos OS, issuing the rollback 0 command reverts the candidate configuration to the last committed configuration. If you have made changes to some interfaces but have not committed those changes, using rollback 0 will discard these uncommitted changes, reverting to the state of the configuration at the time of the last commit. This command does not affect system files like messages.log, reboot the device, or load the factory default configuration; it simply undoes uncommitted changes.
34. Frage
Which protocol would you configure to synchronize the time and date on a Junos device?
Antwort: C
Begründung:
The Network Time Protocol (NTP) is designed to synchronize the clocks of computers over a network. Configuring NTP on a Junos device ensures that its clock is set accurately, which is crucial for logging, troubleshooting, and maintaining the integrity of time-sensitive operations and security protocols. NTP allows devices to use a hierarchy of time sources, from primary servers synchronized to a reference clock (such as an atomic clock or GPS time) to secondary servers that distribute the time to other devices on the network.
35. Frage
What is the primary purpose of an IPv6 link-local address?
Antwort: A
Begründung:
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.
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36. Frage
What information does the forwarding table require so that the device forwards traffic? (Choose three.)
Antwort: B,C,E
Begründung:
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.
37. Frage
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