Latest [Oct 10, 2025] SDLCSA Exam with Accurate Supermicro Direct Liquid Cooling Service Associate (SDLCSA) Exam PDF Questions
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NEW QUESTION # 17
What are the full steps and proper order for removing the LPIO board from the PCIe tray?
- A. Remove metal bracket holding down LPIO board > Remove PCIe air shroud > Remove internal fans
- B. Remove a few AOC NIC cards > Remove PCIe tray > Remove motherboard tray
- C. Remove PCIe air shroud > Remove all AOC NIC cards > Remove metal bracket holding down LPIO board
- D. Remove GPU > Remove metal bracket holding down LPIO board > Remove 3 or 4 AOC NIC cards
Answer: C
Explanation:
Removing the LPIO (Low-Profile IO) board from the PCIe tray in the SYS-421GE-TNHR2-LCCinvolves:
* Remove PCIe air shroud: Clears access to components (standard in Supermicro designs).
* Remove all AOC NIC cards: Disconnects cards on the LPIO board for unobstructed removal.
* Remove metal bracket holding down LPIO board: Unscrews (typically 2 screws) the bracket securing the board.Option B follows Supermicro's logical service order (e.g., SYS-420GP-TNAR), ensuring safe access in DLC systems. A (GPU) is unrelated, C (tray removals) is excessive, and D (fans) is irrelevant. B aligns with Supermicro's DLC modularity, making it correct.References:
Supermicro PCIe tray service guides, DLC system IO removal protocols.
NEW QUESTION # 18
What is the color of the PCIe tray's air shroud?
- A. Clear
- B. Black
- C. White
- D. Opaque
Answer: B
Explanation:
The air shroud in Supermicro systems, including those with Direct Liquid Cooling (DLC) solutions like the SYS-421GE-TNHR2-LCC, is typically designed to direct airflow (or in hybrid systems, assist with liquid cooling efficiency) and is made of plastic or composite materials. Based on Supermicro's standard design practices seen in technical documentation and product images (e.g., SYS-420GP-TNAR, a similar GPU server with DLC), the PCIe tray's air shroud is consistently black. This color aids in heat absorption and dissipation, aligning with Supermicro's focus on thermal efficiency in DLC systems, where cold plates and coolant distribution units (CDUs) manage heat directly at the chip level. White or clear shrouds are less common due to aesthetic and thermal considerations, and "opaque" is not a specific color designation. Thus, black is the correct choice, reflecting Supermicro's engineering standards for high-performance computing components.
References:Supermicro product images and manuals (e.g., SYS-420GP-TNAR User Manual), general DLC solution descriptions.
NEW QUESTION # 19
What must be removed first, in order to remove the BMC cable and IO Module from the PCIe tray?
- A. The BMC cage
- B. The AOM cage
- C. The PCIe tray
- D. The AOC cage
Answer: D
Explanation:
The BMC (Baseboard Management Controller) cable and IO Module in Supermicro systems like the SYS-
421GE-TNHR2-LCC are often tied to add-on cards (AOC) within the PCIe tray. The AOC cage (likely an Add-On Card cage) must be removed first to access these components, as it houses cards and cables interfacing with the BMC. Supermicro's design (e.g., SYS-420 series) places AOC cages as sub-assemblies within the PCIe tray, requiring removal before deeper access. A (AOM cage) may be a typo or misidentification, B (BMC cage) isn't standard terminology here, and C (PCIe tray) is too broad since it's the parent assembly. D fits Supermicro's DLC service hierarchy, making it correct.
References: Supermicro PCIe tray sub-assembly guides, DLC system component access.
NEW QUESTION # 20
Which card would you most likely connect to the AOM module (AOM-GP401-PCIE)?
- A. AOC NIC card
- B. Debit card
- C. AOM card
- D. Credit card
Answer: A
Explanation:
The AOM module (AOM-GP401-PCIE) in Supermicro systems is a PCIe-based add-on module, typically for expansion cards like NICs (Network Interface Cards). The AOC NIC card (Add-On Card, Network Interface Card) is the most likely connection, as Supermicro's AOM modules (e.g., in SYS-420 series) are designed to interface with AOC cards for networking in DLC systems. A (AOM card) is vague and not a standard term, while B and D (credit/debit cards) are irrelevant. Supermicro's DLC solutions integrate high-speed networking, making C the verified choice.
References: Supermicro AOM module specs, DLC system networking components.
NEW QUESTION # 21
What are the full steps and proper order for removing the motherboard tray from the chassis of the SYS-
421GE-TNHR2-LCC system?
- A. Loosen 8 screws on both ends of the front of the chassis to loosen the latches > Continue pulling out the tray the rest of the way
- B. Pull down on the latches until the latches release completely > Slowly start pulling the tray out > Release the safety latches on both sides
- C. Loosen 12 screws on both ends of the front of the chassis to loosen the latches > Slowly start pulling the tray out > Continue pulling out the tray the rest of the way
- D. Loosen 2 screws on both ends of the front of the chassis to loosen the latches > Pull down on the latches until the latches release completely > Slowly start pulling the tray out > Release the safety latches on both sides > Lift and move the quick connect cables out of the way > Continue pulling out the tray the rest of the way
Answer: D
Explanation:
Removing the motherboard tray from the SYS-421GE-TNHR2-LCC involves:
* Loosen 2 screws on both ends of the front of the chassis: Secures latches, per Supermicro's design (e.
g., SYS-420GP-TNAR).
* Pull down on the latches until they release completely: Frees the tray.
* Slowly start pulling the tray out: Initiates removal.
* Release the safety latches on both sides: Prevents dropping (DLC safety feature).
* Lift and move the quick connect cables: Clears DLC coolant or power lines.
* Continue pulling out the tray: Completes removal.Option D is the most comprehensive, matching Supermicro's DLC system protocols. A skips screws and cables, B (12 screws) and C (8 screws) exaggerate screw count, lacking safety steps. D ensures safe, complete removal.References:Supermicro motherboard tray removal guides, DLC system safety features.
NEW QUESTION # 22
The power supply units (PSUs) in the SYS-421GE-TNHR2-LCC system are at the back of the chassis, and next to a dummy PSU tray. True or False.
- A. False
- B. True
Answer: B
Explanation:
In Supermicro's high-end servers like the SYS-421GE-TNHR2-LCC, PSUs are typically located at the back of the chassis for accessibility and cooling efficiency, a design consistent with DLC rack-scale solutions (e.g., SYS-420GP-TNAR). The mention of a "dummy PSU tray" suggests a placeholder or empty slot, common in modular designs to maintain airflow or allow future expansion. This layout is standard in Supermicro's DLC systems, where PSUs power both compute and cooling components (e.g., pumps, CDUs). No contradicting evidence exists, and True (A) aligns with Supermicro's chassis architecture, making it the correct answer.
References: Supermicro chassis design specs, DLC system PSU placement.
NEW QUESTION # 23
What are the full steps and proper order for replacing a failed power supply unit in the SYS-421GE-TNHR2- LCC system?
- A. Lift the release lever and use it to pull out the failed power supply unit > Replace the failed power supply unit with a new one > Push the new power supply unit into the tray > Push the release lever down and in until it clicks
- B. Lift the blue lock to unlock the release lever > Push the release lever down and in until it clicks > Ensure the red lock on the release lever is locked
- C. Lift the red lock to unlock the release lever > Lift the release lever and use it to pull out the failed power supply unit > Replace the failed power supply unit with a new one > Ensure the gold connector pins are on the top > Push the new power supply unit into the tray > Push the release lever down and in until it clicks > Ensure the red lock on the release lever is locked
- D. Lift the yellow lock to unlock the release lever > Lift the release lever and use it to pull out the failed power supply unit > Replace the failed power supply unit with a new one
Answer: C
Explanation:
Replacing a PSU in Supermicro's SYS-421GE-TNHR2-LCC follows a detailed, safety-focused process:
Lift the red lock to unlock the release lever: Red is a common Supermicro color for PSU locks.
Lift the release lever and use it to pull out the failed PSU: Standard hot-swap mechanism.
Replace the failed PSU with a new one: Swap the unit.
Ensure the gold connector pins are on the top: Correct orientation for connection.
Push the new PSU into the tray: Slide it in fully.
Push the release lever down and in until it clicks: Locks the PSU.
Ensure the red lock is locked: Confirms security.
Option B covers all steps comprehensively, aligning with Supermicro's DLC system PSU replacement (e.g., SYS-420 manuals). A is incomplete, C reverses steps, and D skips locking, making B correct.
References: Supermicro PSU replacement guides, DLC system power protocols.
NEW QUESTION # 24
Where in the chassis are the internal fans and fan housing located?
- A. In the back of the motherboard tray
- B. In the middle of the motherboard tray
- C. In the back of the PCIe tray
- D. In the middle of the PCIe tray
Answer: B
Explanation:
In Supermicro systems like the SYS-421GE-TNHR2-LCC, internal fans and their housing are typically located in themiddle of the motherboard tray, providing airflow across CPUs and memory, even in DLC setups where liquid cooling handles primary heat removal. This placement, seen in similar systems (e.g., SYS-
420GP-TNAR), balances cooling distribution. A and B (PCIe tray) focus on GPU cooling, not motherboard fans, while C (back of motherboard tray) is less common due to PSU placement. Supermicro's DLC hybrid designs integrate fans centrally on the motherboard tray, making D correct.References:Supermicro chassis layouts, DLC hybrid cooling configurations.
NEW QUESTION # 25
How many screws need to be removed from the metal bracket that holds down the LPIO board / BMC cable?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
The LPIO (Low-Profile IO) board and BMC cable in Supermicro systems are typically secured by a minimal number of screws for quick serviceability, a principle in DLC designs like the SYS-421GE-TNHR2-LCC.
Based on similar systems (e.g., SYS-420GP-TNAR), the metal bracket holding these components is fastened with 2 screws, balancing security and ease of access. Higher counts like 8 (A), 5 (B), or 6 (D) are excessive for a small bracket, while 2 (C) matches Supermicro's standard for IO-related brackets. In DLC contexts, modularity is key, supporting C as the verified number.
References: Supermicro IO board installation guides, DLC system service efficiency.
NEW QUESTION # 26
What are the full steps and proper order for removing the fan board from the motherboard tray?
- A. Pull the fan board straight up and out of the tray
- B. Disconnect the power supply from all the fans > Pull up on the blue levers on each side of the fan board to unlock it > Pull the fan board straight up and out of the tray
- C. Disconnect the power supply from all the fans > Pull the fan board straight up and out of the tray
- D. Pull up on the blue levers on each side of the fan board to unlock it > Pull the fan board straight up and out of the tray
Answer: B
Explanation:
The fan board in Supermicro systems, including the SYS-421GE-TNHR2-LCC with DLC, manages cooling (even in hybrid air/liquid setups). The removal process, per Supermicro's service manuals, involves:
* Disconnect the power supply from all the fans: This ensures safety and prevents damage, a critical step in DLC systems where fans may supplement liquid cooling.
* Pull up on the blue levers on each side of the fan board to unlock it: Blue levers are a common Supermicro design feature for releasing components securely.
* Pull the fan board straight up and out of the tray: Once unlocked, the board is lifted free.Option B includes all necessary steps. A skips disconnection and unlocking, C omits the levers, and D misses power disconnection, risking damage. Supermicro's DLC solutionsemphasize safe maintenance, supporting B as the correct procedure.References:Supermicro motherboard tray service guides, DLC system maintenance protocols.
NEW QUESTION # 27
To remove an AOC NIC card, simply pull the card straight up. True or False.
- A. True
- B. False
Answer: B
Explanation:
Removing an AOC NIC card in Supermicro systems like the SYS-421GE-TNHR2-LCC requires more than pulling straight up. Per standard procedures (e.g., SYS-420GP-TNAR), you must first unscrew the card from its bracket (1 screw) and release any retaining mechanisms (e.g., PCIe slot latch). Simply pulling risks damage to the card or slot, especially in DLC setups with dense configurations. False (B) reflects Supermicro' s emphasis on careful hardware handling, making it the correct answer.References:Supermicro AOC card removal guides, DLC system component safety.
NEW QUESTION # 28
What safety feature prevents the motherboard tray from being removed too quickly and potentially dropped?
- A. A safety pin
- B. A safety latch
- C. A safety switch
- D. A safety cable
Answer: B
Explanation:
In Supermicro servers like the SYS-421GE-TNHR2-LCC, the motherboard tray is a critical component, often heavy with CPUs and DLC cold plates. A safety latch is the standard feature to prevent rapid removal and accidental drops, as seen in manuals (e.g., SYS-420GP-TNAR). Latches on both sides must be released deliberately, ensuring controlled extraction. A cable (A) might tether but not prevent speed, a switch (B) controls electronics, and a pin (D) is less common for trays. Supermicro's DLC systems prioritize safe handling, making C the correct safety mechanism.
References: Supermicro motherboard tray removal guides, DLC system safety features.
NEW QUESTION # 29
What design feature helps to align the air shroud back into the motherboard tray?
- A. There are 2 tabs on the sides of the air shroud that should align with 2 slots on top of the PCIe board
- B. There are 3 tabs on front of the air shroud that should align with 3 slots on top of the fan board
- C. There are 4 tabs on front of the air shroud that should align with 4 slots on top of the fan board
- D. There are 2 tabs on front of the air shroud that should align with 2 slots on top of the fan board
Answer: B
Explanation:
In Supermicro systems, the air shroud aligns with the motherboard tray via tabs and slots. The correct feature is3 tabs on the front of the air shroud aligning with 3 slots on top of the fan board, a common design (e.
g., SYS-420GP-TNAR) for precise placement over fans and CPUs. B (4 tabs) and C (2 tabs) deviate from standard counts, while D (PCIe board) misplaces the alignment. Supermicro's DLC hybrid cooling ensures shroud accuracy, making A correct.References:Supermicro air shroud installation guides, DLC system cooling alignment.
NEW QUESTION # 30
Before removing the LPIO board from the PCIe tray, what other component needs to be removed first?
- A. Air shroud
- B. Motherboard tray
- C. GPU tray
- D. Metal bracket
Answer: D
Explanation:
The LPIO (Low-Profile IO) board in Supermicro systems like the SYS-421GE-TNHR2-LCC, part of the PCIe tray, is typically secured by ametal bracketthat must be removed first. This bracket holds the LPIO board and associated cables (e.g., BMC cable) in place, as seen in similar designs (e.g., SYS-420GP-TNAR). Removing it involves unscrewing (often 2 screws) and lifting it off, granting access to the LPIO board. A (GPU tray) is a separate assembly, C (motherboard tray) is unrelated to the PCIe tray's LPIO, and D (air shroud) covers components but doesn't secure the board. Supermicro's DLC systems emphasize modular access, making B the correct step.References:Supermicro PCIe tray service guides, DLC system IO component layouts.
NEW QUESTION # 31
How do you know when the DIMM has been properly inserted back into the slot?
- A. You shouldn't hear a click after you've pressed the DIMM down into the slot
- B. You should see a green lit button on the DIMM
- C. You should still be able to wiggle the DIMM after you've pressed the DIMM down into the slot
- D. You should hear a click after you've pressed the DIMM down into the slot
Answer: D
Explanation:
When inserting a DIMM in Supermicro systems, proper seating is confirmed by aclickas the slot latches snap into place, securing the module (e.g., SYS-420GP-TNAR manuals). This audible feedback is standard in DLC systems for reliable memory installation. B (green button) isn't a feature, C contradicts correct insertion, and D (wiggling) indicates failure. Supermicro's design ensures firm DIMM placement, making A the verified sign.References:Supermicro DIMM installation guides, DLC system component reliability.
NEW QUESTION # 32
When replacing the air shroud onto the motherboard tray, which 2 screws should be placed back first?
- A. The first 2 screws connecting the air shroud to the motherboard tray
- B. The first 2 screws connecting the air shroud to the fan board
- C. The first 2 screws connecting the air shroud to the fan board
- D. The first 2 screws connecting the air shroud to the PCIe tray
Answer: A
Explanation:
Replacing the air shroud onto the motherboard tray in a Supermicro system involves securing it to the tray itself first for stability. The correct screws are those connecting the shroud directly to the motherboard tray, as outlined in Supermicro's assembly guides (e.g., SYS-420 series). These initial screws align and anchor the shroud, ensuring proper fitment before additional connections (if any). Options B (PCIe tray) and C/D (fan board) are incorrect since the shroud's primary attachment is to the motherboard tray, not other components.
In DLC systems, precise shroud placement enhances cooling efficiency, supporting A as the correct choice.
References:Supermicro motherboard tray assembly guides, DLC system component integration.
NEW QUESTION # 33
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