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NEW QUESTION # 18
Which two statements describe the result when you enter ? at the command-line prompt?
(Choose two.)
Answer: A,D
Explanation:
When you enter ? at the command-line prompt in Junos OS, the system provides assistance in two significant ways. Firstly, it lists the available commands and options that can be used at the current point in the command hierarchy, aiding users in understanding what commands they can execute next. Secondly, it displays summary information about those commands and options, providing brief descriptions or additional context that can help users understand the function of each command or option. This feature is particularly useful for learning the command structure or for quick reference when specific command syntax is forgotten.
NEW QUESTION # 19
Which two tasks would you perform in operational mode? (Choose two.)
Answer: B,D
Explanation:
The Junos Command Line Interface (CLI) is structured into two primary hierarchical modes:
operational mode and configuration mode. Operational mode is the default entry point when a user logs into the device, signified by the > prompt. This mode is designed for monitoring the health of the device, troubleshooting network issues, and executing system-level maintenance tasks. Specifically, an administrator uses operational mode to verify the version of Junos OS currently active on the device using the show version command.
Additionally, system-level administrative actions that do not involve modifying the device's persistent configuration logic are performed within the operational mode. This includes requesting the system to reboot or halt via the request system hierarchy of commands. In contrast, tasks that involve manipulating the configuration database--such as committing proposed changes or rolling back to a previous configuration version--require the user to transition into configuration mode, indicated by the # prompt. Understanding this distinction is vital for efficient navigation of the Junos CLI; while operational mode provides the tools to observe the system and manage its physical state, configuration mode is reserved for altering the logical parameters and routing policies that govern device behavior.
NEW QUESTION # 20
You are configuring a new router and want to ensure that you can recover from future misconfigurations. In this scenario, what should you do after completing the initial configuration?
Answer: D
Explanation:
In the Junos OS architecture, maintaining a reliable recovery point is a critical post-installation task. While the system automatically archives previous configurations as " rollback " files every time a commit is performed, these files are transient and can eventually be rotated out of the default 50-file history as new changes are made. To ensure a permanent and reliable recovery state, a Senior Architect should manually create a rescue configuration .
The rescue configuration is a specifically designated file used to restore a device to a known-working state if it becomes unreachable or the configuration becomes corrupted. Unlike standard rollbacks, the rescue configuration is only created or updated when an administrator explicitly issues the operational mode command request system configuration rescue save. This ensures that even if several subsequent commits flush the desired initial state from the standard rollback archive, the " safe harbor " configuration remains intact on the storage media. This state can then be re-activated via the rollback rescue command in configuration mode followed by a commit. Setting a rescue configuration after the initial setup is a foundational best practice for disaster recovery and operational stability, providing a " last resort " configuration that is immune to the automated rotation of the commit history.
Reference: Operational Monitoring and Maintenance, Rescue Configuration and Recovery.
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 component is considered part of the data plane?
Answer: C
Explanation:
The Packet Forwarding Engine (PFE) is an integral component of Juniper Networks devices, responsible for the data plane operations. The data plane, also known as the forwarding plane, is where the actual processing and forwarding of packets occur based on the routing and forwarding tables. The PFE executes the forwarding decisions made by the Routing Engine (RE), handling all packet transmissions, including routing, filtering, and switching packets towards their destination. This contrasts with the control plane operations handled by the RE, which involve routing table maintenance, system management, and control protocol processing.
NEW QUESTION # 23
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