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| Section | Objectives |
|---|---|
| Topic 1: Networking Fundamentals | - Core Networking Concepts
|
| Topic 2: Routing Fundamentals | - Routing Concepts and Configuration
|
| Topic 3: Routing Policy and Firewall Filters | - Policy Control and Packet Filtering
|
| Topic 4: Junos OS Fundamentals | - Junos Architecture and Operations
|
| Topic 5: User Interfaces and Configuration Basics | - CLI and Basic Configuration
|
| Topic 6: Operational Monitoring and Maintenance | - Monitoring and Troubleshooting
|
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NEW QUESTION # 100
You are using the factory default configuration on a new Juniper router. You must successfully commit the configuration and activate the device. Which component must be configured before Junos OS will allow you to accomplish this task?
Answer: C
Explanation:
When a Junos device is initialized for the first time or after a factory reset, it operates with a " factory-default
" configuration. This configuration contains the minimum settings necessary for the device to boot, but it lacks essential security parameters. The Junos OS kernel enforces a strict security mechanism that prevents any administrator from successfully executing a commit command until a root-level password has been defined.
Specifically, the root-authentication object must be configured under the [edit system] hierarchy. This requirement ensures that no Junos device is deployed into a production environment with an open, unauthenticated root account. If an administrator attempts to commit changes without this setting, the configuration parser will return a " missing mandatory statement " error and the commit process will fail.
While other settings-such as a system hostname, management IP address (on the fxp0 or me0 interfaces), or logical interface configurations-are critical for operational readiness, they are not strictly enforced by the system validation logic for the initial activation. Only the root-authentication (which can be a plain-text password or an encrypted key) is a hard prerequisite for transitioning the device from a default state to an active, running configuration.
Reference: Configuration Basics, Initial Configuration, System Security.
NEW QUESTION # 101
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
Explanation:
In the Junos OS environment, distinguishing between static diagnostic data and real-time telemetry is crucial for effective troubleshooting. While commands like show interfaces provide a cumulative snapshot of counters since the last reboot or counter clear, they do not easily reveal instantaneous spikes or fluctuating utilization patterns. To address the requirement for " live, real-time traffic updates, " the monitor interface command is the correct operational tool.
When an architect executes monitor interface ge-0/0/5, the CLI launches an interactive, ncurses-based screen that refreshes every second. This display provides immediate visibility into input and output bits-per-second (bps), packets-per-second (pps), and error increments. Unlike static commands, this real-time stream allows a technician to observe micro-bursts or sustained high-utilization periods as they occur, which is essential for diagnosing " intermittent slowness " caused by congestion. In contrast, show chassis hardware focuses on physical inventory, and show interfaces terse only provides administrative and operational status. Even the extensive version of the show command only offers a point-in-time calculation of averages. Therefore, monitor interface is the primary mechanism for interactive performance auditing of individual ports on the Packet Forwarding Engine.
Reference: Operational Monitoring and Maintenance, Real-time Interface Monitoring.
NEW QUESTION # 102 
Referring to the exhibit, you are configuring a Junos router to provide connectivity to a building across town on the network 10.10.10.0/24. The next-hop router is at 10.10.1.1, which is reachable using interface ge-0/0/1.
After committing the configuration in the exhibit, users report they still cannot reach the 10.10.10.0/24 network, and the route does not appear as active in the routing table. In this scenario, which statement is correct?
Answer: A
Explanation:
In Junos OS, the Routing Engine (RE) performs a validation check on every entry in the Routing Information Base (RIB). For a static route to be considered valid and transition to an active state in the inet.0 table, its designated next hop must be resolvable . A next-hop address is resolvable only if the router has an existing route (typically a directly connected route) to that specific IP address.
According to the exhibit, the static route for 10.10.10.0/24 has been configured with a next hop of 10.1.1.1 .
However, the scenario states that the actual gateway router is located at 10.10.1.1 . If the local interface (ge-0
/0/1) is configured with an IP in the 10.10.1.0/x subnet, the router will have a direct route to 10.10.1.1, but it will likely have no path to the 10.1.1.1 address provided in the exhibit.
Because the router cannot resolve the next hop 10.1.1.1 , the static route is placed in an " inactive " or " hidden " state. It will not be installed in the forwarding table pushed to the Packet Forwarding Engine (PFE), and standard show route commands will not display it unless specific flags like hidden or all are used. This logic ensures that the router does not attempt to forward packets into a " black hole " where the gateway is logically unreachable. To fix this, the administrator must modify the configuration to point to the correct, reachable next-hop address of 10.10.1.1.
Reference: Routing Fundamentals, Static Route Resolution, and Troubleshooting Routing Tables.
NEW QUESTION # 103
A security policy requires that a user account be created for auditing purposes. This user should only view configuration and operational data without making any changes. Which predefined login class would satisfy this requirement?
Answer: D
Explanation:
Junos OS provides several predefined login classes to implement Role-Based Access Control (RBAC) efficiently. For an auditor who needs to verify the current state of the device without the risk of altering it, the read-only class is the ideal choice.
The read-only class allows a user to log in and execute show commands to view the running configuration and operational statistics. However, it strictly prohibits the user from entering configuration mode (using the configure command) or executing any " impactful " operational commands that could reset counters, clear log files, or affect traffic flow.
It is important to distinguish this from the operator class. While the operator class also cannot change the configuration, it does have permissions to clear interface statistics, reset routing protocol neighbors, and perform other " clear " or " reset " actions. For a pure auditing role where even resetting a counter would be considered a breach of policy, read-only provides the necessary " look but don ' t touch " environment. The super-user class, conversely, has full unrestricted access, and unauthorized is not a standard functional class.
Using the read-only class ensures compliance with security best practices by granting the minimum necessary privileges required for the auditing task.
Reference: User Interfaces, Predefined Login Classes, Access Control.
NEW QUESTION # 104
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
Answer: D
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 # 105
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