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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | JNCIA-Junos (Junos, Associate) Exam |
| Exam Number: | JN0-106 |
| Exam Format: | Scenario-based questions, Multiple choice |
| Available Languages: | English |
| Real Exam Qty: | Approximately 65 multiple-choice questions |
| Exam Price: | $200 USD (may vary by region) |
| Exam Duration: | 90 minutes |
| Related Certifications: | JNCIP-Junos JNCIS-Junos JNCIE-Junos |
| Certificate Validity Period: | 3 years |
| Passing Score: | Approximately 60โ70% (exact score not publicly fixed) |
| 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 # 19
Which two actions would you perform when you are in the operational mode of the CLI? (Choose two.)
Answer: B,D
Explanation:
The Junos Command Line Interface (CLI) is strictly partitioned into operational and configuration modes to maintain a clear boundary between monitoring and administrative changes. Operational mode, identified by the > prompt, is designed for executing commands that monitor device status, troubleshoot network connectivity, and manage the physical system state. One typical administrative task performed here is clearing log files (using the clear log command) to free up storage space or reset diagnostic data during troubleshooting.
Additionally, high-level system requests that do not alter the persistent configuration database, such as rebooting the hardware, are executed in operational mode. The request system reboot command allows the administrator to gracefully restart the device after a software update or as part of a maintenance cycle. In contrast, actions such as configuring routing protocols or committing changes require transitioning to configuration mode (the # prompt). Committing a configuration is the specific act of moving changes from the candidate database to the active database, which is a logic-altering event strictly reserved for configuration mode. Therefore, operational mode remains the dedicated environment for real-time observation and system-level requests that ensure the device operates correctly within its existing parameters.
NEW QUESTION # 20
Your team alerts you that users connected to ge-0/0/5 are experiencing intermittent slowness. You log in to the switch and want to see live, real-time traffic updates for that interface to determine whether the link is being over-utilized. Which monitoring command should you use in this scenario?
Answer: B
NEW QUESTION # 21
Exhibit:
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: D
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.
Reference: Routing Policy and Firewall Filters, Firewall Filter Evaluation, Implicit Discard.
NEW QUESTION # 22
Which two characteristics apply to TCP? (Choose two.)
Answer: C,D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From: The Transmission Control Protocol (TCP) is a core transport-layer protocol within the TCP/IP suite designed to provide a highly reliable, connection-oriented service. Unlike the User Datagram Protocol (UDP), which is connectionless and best- effort, TCP ensures that data is delivered accurately and in the correct order. A defining characteristic of TCP is its use of a three-way handshake to establish a session. This process involves the exchange of SYN, SYN- ACK, and ACK segments, which synchronizes sequence numbers between the two endpoints and ensures both hosts are ready for data transfer.
Furthermore, TCP provides reliable, ordered delivery by utilizing sequence numbers and acknowledgments. Each data segment is assigned a sequence number; the receiving host uses these numbers to reassemble the data in its original order, even if segments arrive out of sequence due to network jitter or multiple paths. If a segment is lost, the lack of a timely acknowledgment triggers a retransmission, guaranteeing that the application receives all data. TCP does not provide fixed latency guarantees, as its error- recovery mechanisms can introduce delays. Additionally, TCP is a unicast-only protocol and does not support broadcasting on Ethernet. Reference: Networking Fundamentals, Transport Layer Protocols, TCP vs.
UDP.
NEW QUESTION # 23
You must view the forwarding table on your Junos device to troubleshoot a packet forwarding issue. In this scenario, which command would display the forwarding table?
Answer: C
Explanation:
To effectively troubleshoot packet forwarding in a Junos environment, an architect must distinguish between the control plane ' s Routing Information Base (RIB) and the data plane ' s Forwarding Information Base (FIB). While the command show route displays the RIB (the master routing table maintained by the Routing Engine), it does not necessarily reflect the actual instructions being executed by the hardware. The definitive command for viewing the data plane ' s active path selection is show route forwarding-table.
Executing this command reveals the contents of the FIB as it has been pushed from the Routing Engine to the Packet Forwarding Engine (PFE). The output provides critical diagnostic data, including the destination prefix, the specific next-hop IP address, the interface through which the packet will egress, and the type of route (such as unicast or broadcast). This is the " ground truth " for packet movement; if a route exists in the RIB but is missing from the forwarding table, it indicates a failure in the communication between the RE and PFE. Utilizing this command is the primary method for identifying black holes, incorrect next-hop resolution, or issues with hardware-level filter applications that might be impacting transit traffic flow at wire speed.
Reference: Routing Fundamentals, Forwarding Information Base (FIB), Troubleshooting Forwarding.
NEW QUESTION # 24
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