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NEW QUESTION # 73
Which two tasks are performed by the Routing Engine in a Junos device? (Choose two.)
Answer: A,D
Explanation:
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. Reference: Junos OS Fundamentals, Routing Engine Functions, Management and Control Planes.
NEW QUESTION # 74
You committed a new configuration on a Junos router, but users report connectivity issues. You must quickly restore the previous working configuration without manually editing the candidate configuration. Which command should you use to load the required configuration into the candidate configuration?
Answer: D
Explanation:
The previous committed configuration is stored as rollback 1, and loading it into the candidate configuration restores the last known working state quickly without manual edits.
NEW QUESTION # 75
Which Junos tool should you use to identify the path that packets take through the network to a destination?
Answer: D
Explanation:
When you need to visualize the hop-by-hop journey of a packet across a multi-vendor or Junos-based network, traceroute is the definitive operational tool. Unlike ping , which merely confirms end-to-end reachability by eliciting an Echo Reply, traceroute provides a clinical breakdown of every Layer 3 device (router or switch) in the path.
The mechanics of this tool are quite clever: it sends out a sequence of packets (usually UDP or ICMP) with an increasing Time-to-Live (TTL) value, starting at 1. When the first router receives the packet, it decrements the TTL to 0, discards the packet, and sends an ICMP " Time Exceeded " message back to the source. This informs your Junos device of the first hop ' s identity. This process repeats, incrementing the TTL each time, until the packet reaches the final destination. This path discovery is vital for identifying where traffic might be diverted by a misconfigured routing policy or where latency is being introduced in the network fabric. While monitor interface traffic gives you real-time throughput on a local port and SNMP provides historical telemetry to a management station, neither can map the external topological path like traceroute. In the Junos CLI, you can even specify the source address or bypass the routing table to test specific egress paths.
Reference: Operational Monitoring and Maintenance, Troubleshooting Network Connectivity.
NEW QUESTION # 76
You successfully committed a configuration change. You now realize an issue exists and must revert back to the previous configuration. Which command entered in configuration mode will accomplish this task when committed?
Answer: D
Explanation:
Junos OS features a sophisticated configuration management system that automatically creates a snapshot of the active configuration every time a commit is successfully performed. These snapshots are stored as rollback files in a historical archive. Within the configuration mode hierarchy, the rollback command allows an administrator to discard current candidate changes and load a previously committed configuration into the candidate buffer.
The numbering of these rollback files is sequential and follows a specific logic: rollback 0 represents the configuration that is currently active and running on the system. To revert to the state that existed immediately prior to the most recent commit, the administrator must use rollback 1. This command overwrites the current candidate configuration with the previous operational state. It is important to note that executing rollback 1 does not immediately impact the running system; it merely populates the candidate database. The changes must still be verified-often using show | compare-and then finalized by executing the commit command.
By default, Junos maintains up to 50 of these rollback configurations (and up to 100 on certain platforms
/versions), providing a robust safety net for operational recovery and auditing. Reference: Configuration Basics, Managing Configurations, Rollback configurations.
NEW QUESTION # 77
Which command would you use to gracefully power off a Junos device?
Answer: C
Explanation:
Maintaining the integrity of the Junos OS file system is a critical operational requirement, especially during maintenance that involves removing power from the hardware. To achieve a graceful power- down, the request system halt command must be used. This command initiates a systematic shutdown of all running software processes and daemons, flushes any pending data from the system's volatile memory (RAM) to the solid-state storage or hard disk, and unmounts the file systems correctly. Once the software has safely shut down, the console will typically display a message indicating that it is safe to turn off the physical power switch or remove the power cables.
Using request system halt prevents potential file system corruption that can occur if power is abruptly cut while the OS is actively writing logs or configuration data. This is distinct from request system reboot, which restarts the OS, or request system logout, which merely terminates the current CLI session. As a Senior Architect, it is essential to follow this procedure to ensure that the device remains in a reliable state for its next power-on cycle. For devices equipped with dual Routing Engines, the command can often be directed to a specific member or both simultaneously to ensure a synchronized and safe shutdown of the entire chassis.
NEW QUESTION # 78
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