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NEW QUESTION # 76
Which two tasks would you perform in operational mode? (Choose two.)
Answer: A,B
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. Reference: User Interfaces, CLI Modes, Operational Mode Commands.
NEW QUESTION # 77
Which two operational mode commands would you use to verify CPU and memory utilization on a Junos device? (Choose two.)
Answer: A,C
Explanation:
In the Junos OS architecture, maintaining visibility into the health of the Routing Engine (RE) is paramount for ensuring control plane stability. The command show chassis routing-engine is the primary tool for a high- level hardware status overview. It provides critical telemetry regarding the RE ' s current CPU utilization (broken down by user, background, and kernel tasks), memory usage statistics, and uptime. This command is essential for identifying if the device ' s " brain " is under significant stress due to heavy protocol processing or management tasks.
For a more granular, process-specific analysis, the show system processes extensive command is utilized.
Similar to the ' top ' utility in Unix-based systems, it lists all active software daemons (such as rpd for routing, dcd for interfaces, and mgd for management) and ranks them by their real-time CPU and memory consumption. This allows an architect to pinpoint exactly which process might be causing a performance bottleneck. While show chassis environment focuses on physical hardware health like temperatures and fan speeds, and resource-monitor provides summary data, the combination of show chassis routing-engine and show system processes extensive offers the most comprehensive diagnostic view of the device ' s internal computational resources. Reference: Operational Monitoring and Maintenance, System Health Monitoring.
NEW QUESTION # 78
Which two actions would you perform when you are in the operational mode of the CLI? (Choose two.)
Answer: B,D
Explanation:
The Junos Command Line Interface (CLI) is strictly partitioned into operational and configuration modes to maintain a clear boundary between monitoring and administrative changes. Operational mode, identified by the > prompt, is designed for executing commands that monitor device status, troubleshoot network connectivity, and manage the physical system state. One typical administrative task performed here is clearing log files (using the clear log command) to free up storage space or reset diagnostic data during troubleshooting.
Additionally, high-level system requests that do not alter the persistent configuration database, such as rebooting the hardware, are executed in operational mode. The request system reboot command allows the administrator to gracefully restart the device after a software update or as part of a maintenance cycle. In contrast, actions such as configuring routing protocols or committing changes require transitioning to configuration mode (the # prompt). Committing a configuration is the specific act of moving changes from the candidate database to the active database, which is a logic-altering event strictly reserved for configuration mode. Therefore, operational mode remains the dedicated environment for real-time observation and system- level requests that ensure the device operates correctly within its existing parameters. Reference: User Interfaces, CLI Modes, Operational Mode Commands.
NEW QUESTION # 79
What information is exchanged during a TCP three-way handshake? (Choose two.)
Answer: B,C
Explanation:
Sequence numbers are exchanged to establish reliable communication and track the order of transmitted data.
Port numbers are exchanged to identify the sending and receiving applications on the devices.
NEW QUESTION # 80
When multiple routes exist to the same destination IP address, which rule do routers use to select the next hop?
Answer: C
Explanation:
Routers select the route with the longest prefix match, meaning the most specific route, to determine the next hop for forwarding traffic.
NEW QUESTION # 81
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