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>> Reliable JN0-106 Exam Questions <<
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NEW QUESTION # 39
Which command would compare the candidate configuration with the active configuration before committing the changes?
Answer: A
Explanation:
The Junos OS operates using a candidate configuration model, where changes are made in a temporary buffer before being applied to the running system. To ensure accuracy and prevent unintended network disruptions, it is a critical best practice to review the differences between the candidate buffer and the currently active configuration. The command show | compare executed from the [edit] hierarchy level is the primary tool for this task.
When this command is issued, the CLI performs a line-by-line comparison. The output uses a " diff " format:
lines prefixed with a plus sign (+) represent new statements added to the candidate configuration, while lines prefixed with a minus sign (-) indicate statements that have been removed. This visualization allows the architect to verify exactly what will change upon execution of the commit command. Unlike operational mode commands that only show the final state, show | compare highlights the delta, making it indispensable for auditing complex policy changes or interface reconfigurations. This step acts as a final manual validation gate, reducing the risk of syntax errors or logical misconfigurations entering the production environment.
Using this command is a fundamental skill for passing the JNCIA-Junos exam and for professional day-to-day operations.
Reference: Configuration Basics, Comparing Configurations, Candidate vs. Active.
NEW QUESTION # 40
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: 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.
Reference: Routing Policy and Firewall Filters, Firewall Filter Evaluation, Implicit Discard.
NEW QUESTION # 41
Which command is used to view real-time traffic statistics for all interfaces?
Answer: C
Explanation:
In Junos OS, there is a distinct difference between show commands and monitor commands.
While show commands provide a static snapshot of the current state of the device or its interfaces at the moment the command is executed, monitor commands provide dynamic, real- time updates. To view live traffic statistics across all physical and logical interfaces, the correct command is monitor interface traffic.
When this command is executed, the CLI enters an interactive text-based interface (TUI) that displays a list of interfaces along with their input and output rates in bits per second (bps) and packets per second (pps). The display refreshes automatically (usually every few seconds), allowing an administrator to observe traffic spikes or drops as they occur without manually re- running a command. This is an invaluable tool for troubleshooting congestion or verifying that traffic is flowing as expected after a configuration change. Commands like show interfaces extensive provide significantly more detail--including error counters and physical layer parameters--but they are not real-time and require manual execution to update the statistics. The monitor interface traffic command simplifies the view to focus specifically on throughput metrics across the entire device.
NEW QUESTION # 42
Which statement is correct regarding the Junos OS commit operation?
Answer: C
Explanation:
The commit command applies the candidate configuration, making it the new active configuration.
Junos OS also retains rollback configurations so you can revert to previous states if needed.
NEW QUESTION # 43
What are two link-state routing protocols? (Choose two.)
Answer: B,D
Explanation:
Link-state routing protocols are a type of routing protocol used in packet-switching networks for finding the best path between source and destination. OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are both examples of link-state routing protocols.
They work by maintaining a complete map or topology of the network, allowing routers to independently calculate the best path to each destination. Unlike distance-vector protocols like RIP, link-state protocols are more efficient and scalable, making them suitable for larger networks.
NEW QUESTION # 44
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