Quick Answer
The answer is to use the command sequence `request chassis pic slot <slot> offline` followed by `request chassis fpc <slot> offline`. This is correct because the FPC-level command gracefully deactivates the entire line card by halting traffic, closing active sessions, and safely powering down the hardware, while the PIC-level command first takes individual Physical Interface Cards offline to prevent residual data flow. On the JNCIA-Junos exam, this tests your understanding of Junos operational commands for hardware maintenance, often appearing in scenarios where you must distinguish between deactivating a full FPC versus a single PIC. A common trap is to use only the PIC command, which leaves the FPC powered and risks incomplete shutdown. Remember the hierarchy: PICs are children of the FPC, so you gracefully disable the children first, then the parent. A useful memory tip is “PIC before FPC, or your card will weep.”
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a maintenance window, an engineer plans to replace a line card. Which command sequence is most appropriate to gracefully deactivate the card before removal?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
request chassis pic slot <slot> offline; request chassis fpc <slot> offline
Gracefully deactivates the PIC and FPC.
delete interfaces fxp0
Why wrong: Deletes management interface, not appropriate.
set interfaces <name> disable
Why wrong: Disables a specific interface, not the line card.
request system reboot
Why wrong: Reboots the entire system, not specific to line card.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
request chassis pic slot <slot> offline; request chassis fpc <slot> offline
Option A is correct because the 'request chassis fpc <slot> offline' command gracefully deactivates the Flexible PIC Concentrator (FPC) by stopping traffic, closing sessions, and powering down the line card safely. The 'request chassis pic slot <slot> offline' command is used for individual PICs, but for a full line card (FPC), the FPC-level command is the appropriate sequence to ensure no traffic disruption or hardware damage during removal.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
request chassis pic slot <slot> offline; request chassis fpc <slot> offline
Why this is correct
Gracefully deactivates the PIC and FPC.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
delete interfaces fxp0
Why it's wrong here
Deletes management interface, not appropriate.
set interfaces <name> disable
Why it's wrong here
Disables a specific interface, not the line card.
request system reboot
Why it's wrong here
Reboots the entire system, not specific to line card.
Common exam traps
The trap here is that candidates may confuse PIC-level and FPC-level commands, thinking 'request chassis pic slot <slot> offline' alone is sufficient for a line card, when the FPC command is required to deactivate the entire card including all its PICs and power supply.
Detailed technical explanation
The 'request chassis fpc <slot> offline' command triggers a graceful shutdown sequence that stops all Packet Forwarding Engine (PFE) processes, drains traffic queues, and powers off the FPC's voltage regulators, ensuring no data loss or electrical damage. Under the hood, this command sends a graceful shutdown signal to the FPC's microcontroller, which then coordinates with the Routing Engine to halt forwarding and release resources. In real-world scenarios, failing to use this command can cause traffic blackholes or hardware damage due to hot-swapping without proper power-down.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the JNCIA-JUNOS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operational Monitoring and Maintenance — study guide chapter
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FAQ
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
The correct answer is: request chassis pic slot <slot> offline; request chassis fpc <slot> offline — Option A is correct because the 'request chassis fpc <slot> offline' command gracefully deactivates the Flexible PIC Concentrator (FPC) by stopping traffic, closing sessions, and powering down the line card safely. The 'request chassis pic slot <slot> offline' command is used for individual PICs, but for a full line card (FPC), the FPC-level command is the appropriate sequence to ensure no traffic disruption or hardware damage during removal.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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