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NEW QUESTION # 19
Which statement accurately describes the Junos candidate configuration?
Answer: A
Explanation:
In the Junos OS architecture, the configuration environment is strictly bifurcated to ensure system stability and integrity. The candidate configuration is a specific database that serves as a staging area, storing all proposed changes made by an administrator during a configuration session before they are finalized. Unlike other network operating systems where changes might take effect immediately upon entry, Junos utilizes this
" sandbox " approach where modifications reside only in the candidate database until a commit command is explicitly executed.
Once the commit process is initiated, the Junos OS kernel validates the candidate configuration for syntax errors and logical consistency. If the validation check is successful, the candidate configuration is promoted and becomes the active configuration-the operational state currently running on the device hardware. This separation allows multiple administrators to work on complex changes without impacting live transit traffic or device stability prematurely. If a mistake is identified during the editing process, the candidate configuration can be easily discarded or compared against the active state to identify discrepancies. This workflow is a cornerstone of Junos OS, facilitating a " check-before-apply " methodology that is essential for carrier-grade reliability and minimizing the risk of accidental outages during critical maintenance windows. Reference:
Junos OS Fundamentals, Configuration Databases, Candidate vs. Active.
NEW QUESTION # 20
Which two traffic types are processed by a Routing Engine using Junos OS? (Choose two.)
Answer: A,B
Explanation:
The Routing Engine (RE) in a Junos device serves as the centralized intelligence and management hub, primarily responsible for the control and management planes of the system. In this capacity, the RE is tasked with processing routing updates, such as OSPF Link State Advertisements (LSAs) or BGP Update messages.
These updates are vital for the RE to maintain the Routing Information Base (RIB), calculate the shortest paths, and subsequently populate the Forwarding Information Base (FIB) which is then pushed to the Packet Forwarding Engine (PFE).
Furthermore, the Routing Engine handles all local management traffic. This category encompasses administrative access through the Command Line Interface (CLI) via SSH or Telnet, SNMP queries from network management systems, and system logging processes. Because the RE runs the Junos OS kernel, it must directly interpret and respond to these management-level requests to ensure the device remains configurable and observable. Conversely, transit traffic-the data passing through the device from one ingress port to an egress port-is offloaded to the PFE to be handled at wire speed. While the PFE manages the heavy lifting of data forwarding and Class of Service (CoS) application, the RE remains focused on high-level protocol maintenance and system administration, ensuring that control plane stability is maintained even under heavy traffic loads. Reference: Junos OS Fundamentals, Control Plane Functions, Routing Engine Traffic.
NEW QUESTION # 21
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
Answer: C
Explanation:
Junos OS firewall filters operate on a sequential, " first-match " logic, but their behavior is significantly influenced by the use of terminating versus non-terminating actions. In this exhibit, a packet with a source address of 10.0.0.0/8 is evaluated against the filter named test.
Evaluation begins with term 1 . The packet matches the source-address criteria, triggering the actions defined in the then statement. The first action is log, which sends the packet header information to the firewall task buffer for logging. The second action is next term . This is a critical non-terminating action ; it instructs the Packet Forwarding Engine (PFE) to continue the evaluation process using the subsequent term in the filter rather than stopping after the match.
Evaluation then moves to term 2 . Because term 2 contains no from match conditions, it acts as a " catch-all " for any traffic that reaches it. The action in this term is reject . This is a terminating action that discards the packet and sends an ICMP " destination unreachable " message back to the source. Therefore, the packet is first recorded by the logging process and is subsequently dropped by the rejection mechanism. If next term had not been present in term 1 , the packet would have been implicitly accepted (as any matched term without a terminating action like discard, reject, or accept defaults to an implicit accept in that specific term).
However, the explicit instruction to move forward ensures the packet hits the reject statement.
Reference: Routing Policy and Firewall Filters, Firewall Filter Actions, next-term evaluation.
NEW QUESTION # 22
Which two statements are true about the Junos OS? (Choose two.)
Answer: C,D
NEW QUESTION # 23
You are logged in to a Junos OS device with SSH and issued the show protocols | compare command in the configuration, but no output is shown. Which statement is correct in this scenario?
Answer: B
Explanation:
If issuing the "show | compare" command in configuration mode yields no output, it indicates that there are no changes to the candidate configuration (B). This command is used to compare the current candidate configuration with the active configuration, and a lack of output suggests that the candidate configuration matches the active one, meaning no changes have been made or the changes have already been committed.
NEW QUESTION # 24
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