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Question 1Data Center Fundamentals and Infrastructure

Which tier of the Uptime Institute data center classification allows for concurrent maintainability of all critical components without shutting down the IT load?

  1. Tier IV
  2. Tier III Correct answer.
  3. Tier I
  4. Tier II

Explanation

Tier III requires redundant capacity components and multiple independent distribution paths, enabling any component to be maintained while the IT load continues operating. Tier IV adds full fault tolerance so the load survives a single worst-case failure, which is a stronger requirement than concurrent maintainability.

Question 2Data Center Fundamentals and Infrastructure

In a raised-floor data center, what is the primary purpose of the plenum beneath the floor tiles?

  1. To distribute conditioned cool air to the equipment Correct answer.
  2. To provide structural support for the slab
  3. To store spare cabling and tools
  4. To route electrical conduit only

Explanation

The sub-floor plenum is used as an air distribution path, delivering cold air through perforated tiles or grates to the front of racks. Cable and conduit may occupy the space, but that is incidental rather than the design purpose.

Question 3Data Center Fundamentals and Infrastructure

A rack draws 8 kW of IT load. Using a common rule-of-thumb conversion, approximately how much heat in BTU/hr must the cooling system remove from that rack?

  1. About 27,300 BTU/hr Correct answer.
  2. About 8,000 BTU/hr
  3. About 13,600 BTU/hr
  4. About 2,930 BTU/hr

Explanation

Essentially all electrical energy consumed by IT equipment is released as heat, and one kilowatt equals approximately 3,412 BTU/hr. Multiplying 8 kW by 3,412 gives roughly 27,300 BTU/hr.

Question 4Data Center Fundamentals and Infrastructure

Which document type defines the electrical and mechanical capacity, redundancy topology, and design intent for a specific data center facility?

  1. A rack elevation drawing
  2. A service level agreement
  3. A network topology diagram
  4. A critical facility design basis Correct answer.

Explanation

The design basis records the assumptions, redundancy topology, and capacity targets the facility is engineered to meet. Drawings and agreements reference these parameters but do not establish them as the governing design intent.

Question 5Data Center Fundamentals and Infrastructure

Which fire suppression agent is most commonly selected for occupied data halls because it leaves no residue on electronic equipment?

  1. Water from a wet-pipe sprinkler system
  2. Dry chemical powder
  3. Clean agent such as an inert gas blend Correct answer.
  4. Foam

Explanation

Clean agents extinguish fire without leaving conductive or abrasive residue, protecting sensitive electronics and avoiding cleanup downtime. Water, powder, and foam can all damage energized equipment or leave deposits.

Question 6Data Center Fundamentals and Infrastructure

What does a PUE value of 1.4 indicate about a data center?

  1. Total facility power is 1.4 times the IT equipment power Correct answer.
  2. The facility uses 1.4 kW per rack on average
  3. IT equipment power is 1.4 times the total facility power
  4. Cooling consumes 40 percent of IT power

Explanation

Power Usage Effectiveness is total facility energy divided by IT equipment energy, so a value of 1.4 means 0.4 units of overhead for every unit delivered to IT. Lower values indicate more of the incoming power reaches IT equipment.

Question 7Data Center Fundamentals and Infrastructure

What is the function of an automatic transfer switch in a data center power train?

  1. It balances load across parallel UPS modules
  2. It switches the load between two power sources Correct answer.
  3. It steps voltage down for distribution to racks
  4. It converts alternating current to direct current for servers

Explanation

An automatic transfer switch monitors a primary source and transfers the load to an alternate source when the primary fails or falls out of tolerance. Rectification, voltage transformation, and UPS module sharing are handled by other equipment.

Question 8Data Center Fundamentals and Infrastructure

Which cabling practice most directly reduces airflow blockage in the rear of a rack?

  1. Coiling excess cable loosely behind the rack
  2. Bundling all cables into a single large rear channel
  3. Using vertical cable managers and correctly sized cable lengths Correct answer.
  4. Leaving excess cable slack on top of equipment

Explanation

Vertical managers and properly sized cable runs keep the hot exhaust path clear and reduce impedance to airflow leaving the rack. Loose coils and large bundles obstruct exhaust and create hot spots.

Question 9Data Center Fundamentals and Infrastructure

A facility has N+1 UPS configuration. What does the +1 represent?

  1. One spare utility feed from the grid
  2. One redundant module beyond the number needed to carry the load Correct answer.
  3. One extra cooling unit per row
  4. One additional hour of battery runtime

Explanation

In N+1 notation, N is the capacity required to support the load and the +1 is a redundant unit that can fail or be maintained without dropping the load. It refers to component count, not runtime or utility sources.

Question 10Data Center Fundamentals and Infrastructure

Containment of hot aisle air is being evaluated. Which outcome is the primary benefit?

  1. Higher server fan speed setpoints
  2. Lower electrical load on the UPS
  3. Reduced mixing of hot exhaust with cold supply air Correct answer.
  4. Increased static pressure at the CRAC coil

Explanation

Hot aisle containment captures exhaust air and returns it to the cooling units, preventing it from mixing with cold supply air. This raises return air temperature and improves cooling efficiency without directly changing UPS loading.

Question 11Data Center Fundamentals and Infrastructure

A data hall has a design cooling capacity of 1,000 kW and currently supports 600 kW of IT load. What is the approximate capacity utilization of the cooling plant?

  1. 40 percent
  2. 60 percent Correct answer.
  3. 80 percent
  4. 167 percent

Explanation

Utilization is the current load divided by available capacity, so 600 divided by 1,000 equals 60 percent. Values above 100 percent would indicate the load exceeds design capacity.

Question 12Data Center Fundamentals and Infrastructure

Why is dual-corded IT equipment typically connected to two separate power distribution paths?

  1. To survive the loss of one power path without downtime Correct answer.
  2. To allow the server to run on DC and AC simultaneously
  3. To reduce the total facility power draw
  4. To double the available current per server

Explanation

Two independent paths, often designated A and B, ensure that a failure or maintenance event on one path leaves the other energized. The equipment draws from one path at a time, so total current is not doubled.

Question 13Data Center Fundamentals and Infrastructure

What is the main reason cold aisle supply air is typically delivered at the front of the rack rather than the rear?

  1. Front delivery eliminates the need for containment
  2. Rear delivery increases PUE
  3. Rear delivery reduces cable congestion
  4. Server intake fans are located at the front of the chassis Correct answer.

Explanation

Most rack-mounted servers draw intake air from the front and exhaust to the rear, so cold air must be presented at the front face. Delivering cold air at the rear would fight the equipment's designed airflow path.

Question 14Data Center Fundamentals and Infrastructure

Which condition most directly justifies deploying a liquid cooling solution rather than air cooling for a rack?

  1. The rack is located near a perimeter wall
  2. The facility has surplus chilled water capacity
  3. Rack power density exceeds what air can practically remove Correct answer.
  4. The rack houses network switches

Explanation

Air cooling becomes impractical as rack densities rise because of the volume and velocity of air required. Liquid cooling carries far more heat per unit volume and becomes attractive at high densities.

Question 15Data Center Fundamentals and Infrastructure

What is the purpose of a bypass isolation valve arrangement around a UPS module?

  1. To charge the battery string faster
  2. To allow the module to be serviced while load remains powered Correct answer.
  3. To synchronize the UPS with the utility
  4. To increase the UPS output voltage

Explanation

A maintenance bypass routes power around the UPS so the module can be isolated and serviced without interrupting the load. Voltage regulation, charging, and synchronization are internal UPS functions.

Question 16Data Center Fundamentals and Infrastructure

Which metric best captures whether a data center has enough installed cooling to support planned future IT growth?

  1. Cooling capacity headroom Correct answer.
  2. Rack count
  3. Current PUE
  4. Average inlet temperature

Explanation

Headroom compares installed cooling capacity against present and forecast load, showing how much growth the plant can absorb. PUE, rack count, and inlet temperature describe current operation rather than growth capacity.

Question 17Data Center Fundamentals and Infrastructure

A colocation customer requires that any single power distribution unit failure not affect their equipment. Which design element addresses this requirement?

  1. A larger UPS battery bank
  2. Two independent PDUs feeding A and B circuits Correct answer.
  3. A single PDU sized at twice the load
  4. A higher amperage utility service

Explanation

Independent A and B PDUs on separate paths ensure a single PDU failure leaves the alternate path energized for dual-corded equipment. Oversizing a single PDU does not remove the single point of failure.

Question 18Data Center Fundamentals and Infrastructure

Which statement correctly describes the relationship between server inlet temperature and cooling energy use within recommended ranges?

  1. Inlet temperature has no effect on cooling energy
  2. Raising inlet temperature always increases cooling energy
  3. Raising inlet temperature within allowed limits generally reduces cooling energy Correct answer.
  4. Lowering inlet temperature reduces compressor work

Explanation

Warmer supply air reduces the temperature lift the cooling plant must produce, which typically lowers compressor and economizer energy use. This benefit holds within the equipment manufacturer's allowable inlet range.

Question 19Data Center Fundamentals and Infrastructure

What is the primary role of an economizer in a data center cooling system?

  1. To use outside air or water-side free cooling when conditions allow Correct answer.
  2. To provide backup power during outages
  3. To humidify supply air during winter
  4. To filter particulate contamination from the hall

Explanation

An economizer reduces or eliminates mechanical cooling by using cooler outdoor conditions, either directly with air or indirectly through a fluid loop. This lowers energy consumption when ambient conditions are favorable.

Question 20Data Center Fundamentals and Infrastructure

A data center operates at 500 kW IT load with a total facility load of 750 kW. If the IT load grows to 700 kW with overhead scaling proportionally, what is the approximate new total facility load?

  1. 950 kW
  2. 1,050 kW Correct answer.
  3. 900 kW
  4. 1,200 kW

Explanation

The current PUE is 750 divided by 500, or 1.5. Applying that ratio to 700 kW of IT load gives approximately 1,050 kW total facility load.

Question 21Data Center Fundamentals and Infrastructure

Two racks each draw 6 kW. Rack A is fully populated with high-efficiency servers; Rack B is sparsely populated with older servers. Which statement about heat removal is correct?

  1. Both racks release essentially the same heat because heat follows power draw Correct answer.
  2. Rack A releases more heat because it has more servers
  3. Heat output cannot be compared without knowing the server models
  4. Rack B releases more heat because older servers are less efficient

Explanation

Heat rejection is governed by electrical energy consumed, not by equipment count or efficiency rating, since nearly all input power becomes heat. Two racks at equal power draw therefore impose essentially the same thermal load.

Question 22Data Center Fundamentals and Infrastructure

A Tier III facility is described as concurrently maintainable. Which scenario best tests whether this claim holds?

  1. A utility outage lasting several hours
  2. Planned replacement of one UPS module while IT load runs Correct answer.
  3. A simultaneous failure of two independent power paths
  4. A fire in the main electrical room

Explanation

Concurrent maintainability concerns planned work on individual components without dropping the load. Utility outages, dual-path failures, and fire events test fault tolerance and resilience rather than maintenance capability.

Question 23Data Center Fundamentals and Infrastructure

A raised-floor hall shows cold air short-circuiting directly from perforated tiles into the return plenum near the room perimeter. Which corrective action best addresses the root cause?

  1. Reduce the number of perforated tiles in the hot aisle
  2. Increase CRAC fan speed across the hall
  3. Raise the chilled water supply temperature
  4. Add containment or blanking to close the bypass path Correct answer.

Explanation

Short-circuiting occurs when supply air bypasses the IT load and returns directly, so the fix is to close the bypass path with containment, blanking panels, or grommets. Increasing fan speed would waste more energy on the same leak.

Question 24Data Center Fundamentals and Infrastructure

A UPS rated 500 kVA at 0.9 power factor serves a load with a 0.95 power factor. Which limit governs the real power the UPS can deliver?

  1. The kW rating derived from kVA times the rated power factor Correct answer.
  2. The battery autonomy rating
  3. The kVA rating alone
  4. The load power factor alone

Explanation

A UPS has both an apparent power limit in kVA and a real power limit in kW set by its rated power factor. Even with a better load power factor, the kW ceiling derived from the nameplate rating constrains real power delivery.

Question 25Data Center Fundamentals and Infrastructure

A design calls for N+1 cooling but only N units are currently installed while the hall runs at 50 percent load. What is the most accurate assessment?

  1. The facility meets N+1 because load is below capacity
  2. The facility cannot operate at 50 percent load
  3. The facility exceeds N+1 requirements
  4. The facility has capacity headroom but lacks the specified redundancy Correct answer.

Explanation

Redundancy is about installed component count relative to the load-serving requirement, not about spare capacity. With only N units installed, loss of one unit removes cooling capacity even though headroom exists at half load.

Question 26Data Center Fundamentals and Infrastructure

Which standard is most commonly referenced for classifying data center availability into four tiers?

  1. Uptime Institute Tier Standard Correct answer.
  2. TIA-942
  3. BICSI 002
  4. ISO 27001

Explanation

The Uptime Institute Tier Standard is the most widely recognized framework that defines four tiers (I–IV) based on redundancy and fault tolerance. TIA-942 also includes a tier-like rating system, but it is an ANSI/TIA standard for data center infrastructure, not solely a tier classification. ISO 27001 is an information security management standard, and BICSI 002 is a data center design and implementation best practices standard.

Question 27Data Center Fundamentals and Infrastructure

What is the primary purpose of a hot aisle containment system?

  1. To prevent mixing of hot exhaust air with cold supply air Correct answer.
  2. To provide physical security for the IT equipment
  3. To reduce the electrical load of the IT equipment
  4. To increase the cooling capacity of the CRAC units

Explanation

Hot aisle containment physically separates the hot exhaust air from the cold supply air, preventing mixing and improving cooling efficiency. It does not increase the cooling capacity of the CRAC units themselves, nor does it reduce the electrical load of the IT equipment. Physical security is unrelated to containment.

Question 28Data Center Fundamentals and Infrastructure

Which power distribution architecture provides the highest level of resilience against a single point of failure?

  1. A single UPS with dual PDUs
  2. A single UPS with a static transfer switch
  3. Dual UPSs with dual PDUs Correct answer.
  4. A single UPS with a single power distribution unit (PDU)

Explanation

Dual UPSs with dual PDUs create two independent power paths, so a failure in one UPS or PDU does not affect the other path. A single UPS, even with dual PDUs or a static transfer switch, remains a single point of failure. Dual PDUs from a single UPS do not provide redundancy at the UPS level.

Question 29Data Center Fundamentals and Infrastructure

Which fire suppression agent is commonly used in data centers because it does not leave residue and is safe for energized equipment?

  1. Water mist
  2. Dry chemical powder
  3. Foam
  4. Clean agent (e.g., FM-200 or Novec 1230) Correct answer.

Explanation

Clean agents such as FM-200 or Novec 1230 extinguish fires without leaving residue and are electrically non-conductive, making them suitable for energized IT equipment. Water mist can cause damage to electronics, dry chemical powder leaves corrosive residue, and foam is messy and conductive.

Question 30Data Center Fundamentals and Infrastructure

A data center has a UPS system rated at 800 kW. The IT load is 500 kW, and the UPS efficiency is 95% at this load. What is the approximate power drawn by the UPS from the utility, including the IT load?

  1. 500 kW
  2. 800 kW
  3. 526 kW Correct answer.
  4. 475 kW

Explanation

The UPS must supply the IT load plus its own losses. The input power is the output power divided by efficiency: 500 kW / 0.95 ≈ 526 kW. The other values either ignore losses or misapply the efficiency factor.

Question 31Data Center Fundamentals and Infrastructure

In a raised-floor data center, what is the primary function of perforated floor tiles?

  1. To provide cable management pathways
  2. To allow cold air to enter the cold aisle Correct answer.
  3. To allow hot air to return to the CRAC units
  4. To provide structural support for the raised floor

Explanation

Perforated tiles are placed in the cold aisle to allow conditioned air from the underfloor plenum to enter the aisle and be drawn into the IT equipment. They are not designed for structural support, hot air return (which typically occurs through the ceiling or hot aisle), or cable management.

Question 32Data Center Fundamentals and Infrastructure

A data center has a total IT load of 400 kW and a total facility load of 600 kW. What is the PUE?

  1. 1.33
  2. 2.0
  3. 0.67
  4. 1.5 Correct answer.

Explanation

PUE is total facility power divided by IT power: 600 kW / 400 kW = 1.5. The other values result from inverting the ratio or using incorrect arithmetic.

Question 33Data Center Fundamentals and Infrastructure

Which of the following best describes the role of a CRAC unit in a data center?

  1. It regulates the voltage supplied to IT equipment.
  2. It monitors and manages network traffic.
  3. It provides backup power during a utility outage.
  4. It cools and circulates air within the data hall. Correct answer.

Explanation

A Computer Room Air Conditioner (CRAC) cools and circulates air to maintain temperature and humidity within the data hall. Backup power is provided by UPS and generators, network traffic is managed by switches and routers, and voltage regulation is handled by power conditioning equipment.

Question 34Data Center Fundamentals and Infrastructure

A rack has a nameplate load of 10 kW. The data center is designed for 5 kW per rack. What is the most appropriate action?

  1. Distribute the load across multiple racks or upgrade the cooling and power infrastructure. Correct answer.
  2. Reduce the cooling setpoint to compensate.
  3. Install the rack as is; the nameplate is always higher than actual draw.
  4. Add a second PDU to the rack.

Explanation

The rack load exceeds the design capacity, so the load must be redistributed or the infrastructure upgraded to support it. Assuming the nameplate is always higher is risky, reducing the cooling setpoint does not increase capacity, and adding a PDU does not address the cooling or overall power capacity.

Question 35Data Center Fundamentals and Infrastructure

What is the primary benefit of using a modular UPS system in a data center?

  1. It provides unlimited runtime during an outage.
  2. It eliminates the need for batteries.
  3. It allows capacity to be scaled by adding modules as needed. Correct answer.
  4. It reduces the need for cooling in the UPS room.

Explanation

Modular UPS systems enable scalable capacity and redundancy by adding or replacing power modules, which simplifies growth and maintenance. They still require batteries for runtime, do not provide unlimited runtime, and still generate heat that must be managed.

Question 36Data Center Fundamentals and Infrastructure

In a data center, what does the term "economizer" refer to in the cooling system?

  1. A component that balances the electrical load across phases.
  2. A system that uses outside air or water to provide free cooling. Correct answer.
  3. A device that reduces the electrical load of servers.
  4. A tool for monitoring humidity levels.

Explanation

An economizer uses favorable outdoor conditions (air or water) to provide cooling without running compressors, reducing energy consumption. It does not reduce server electrical load, balance electrical phases, or monitor humidity (though humidity control may be part of the overall system).

Question 37Data Center Fundamentals and Infrastructure

A data center has a design cooling capacity of 500 kW. The current IT load is 300 kW. If the IT load grows by 10% per year, in approximately how many years will the cooling capacity be exceeded?

  1. 5 years Correct answer.
  2. 3 years
  3. 8 years
  4. 10 years

Explanation

Using the rule of 72, the load doubles in about 72/10 = 7.2 years. Starting at 300 kW, it will reach 500 kW before doubling, so the time is less than 7.2 years. Calculating precisely: 300*(1.1)^t = 500 → t = ln(500/300)/ln(1.1) ≈ 5.36 years, so about 5 years.

Question 38Data Center Fundamentals and Infrastructure

What is the purpose of a data center infrastructure management (DCIM) system?

  1. To control access to the data center facility
  2. To automate software deployment across servers
  3. To provide firewall protection for the network
  4. To monitor and manage physical infrastructure assets and their power and cooling usage Correct answer.

Explanation

DCIM systems monitor and manage physical infrastructure such as power, cooling, and asset tracking, providing visibility into capacity and efficiency. Firewall protection is a network security function, software deployment is handled by orchestration tools, and access control is a physical security function.

Question 39Data Center Fundamentals and Infrastructure

A data center operates at a PUE of 1.8. Which of the following is the most likely cause of this relatively high PUE?

  1. The data center uses hot aisle containment.
  2. The UPS system has an efficiency of 99%.
  3. The IT load is very low compared to the cooling capacity. Correct answer.
  4. The cooling system is highly efficient and uses outside air.

Explanation

A high PUE often indicates that overhead (cooling, power distribution) is large relative to IT load, which can occur when IT load is low and cooling systems run inefficiently at part load. Efficient cooling, high UPS efficiency, and containment would tend to lower PUE.

Question 40Data Center Fundamentals and Infrastructure

In a data center with a 2N power distribution design, what does the "2" represent?

  1. Two utility feeds from the same substation
  2. Two times the number of PDUs required for the load
  3. Two UPS modules sharing the load equally
  4. Two independent power paths, each capable of supporting the full load Correct answer.

Explanation

2N means two complete, independent power paths (N + N), each sized to carry the full critical load. This provides full redundancy so that a failure in one path does not affect the load. The other options describe configurations that do not provide full independence.

Question 41Server Hardware Components and Architecture

Which component of a server is responsible for executing program instructions and performing arithmetic and logical operations?

  1. The DIMM
  2. The NIC
  3. The PSU
  4. The CPU Correct answer.

Explanation

The central processing unit fetches, decodes, and executes instructions and performs arithmetic and logic operations. Memory, power, and network components support the CPU but do not execute instructions.

Question 42Server Hardware Components and Architecture

Which memory type is the primary working memory that a server's processor reads and writes during normal operation?

  1. Tape
  2. NAND flash
  3. ROM
  4. DRAM Correct answer.

Explanation

DRAM (dynamic random access memory) is the volatile main memory used by the CPU for active programs and data. Flash, ROM, and tape are non-volatile storage media used for persistence rather than active working memory.

Question 43Server Hardware Components and Architecture

What is the primary purpose of a redundant power supply configuration in a server?

  1. To provide additional network bandwidth
  2. To expand the amount of RAM the server supports
  3. To increase the clock speed of the CPU
  4. To allow the server to keep running if one supply fails Correct answer.

Explanation

Redundant supplies share or back up the load so that a single supply failure does not interrupt server operation. They do not change CPU speed, memory capacity, or network bandwidth.

Question 44Server Hardware Components and Architecture

A server administrator needs storage that provides the fastest random-access performance for a database's hot data. Which media type is the most appropriate?

  1. SATA hard disk drive
  2. Optical disc
  3. Solid-state drive Correct answer.
  4. Magnetic tape

Explanation

Solid-state drives use flash memory with no moving parts, giving much lower random-access latency than spinning disks, optical media, or tape. Databases with hot random-access workloads benefit most from SSDs.

Question 45Server Hardware Components and Architecture

Which server form factor is typically 1.75 inches (one rack unit) tall and mounts in a standard 19-inch equipment rack?

  1. Micro ATX desktop
  2. Blade
  3. Tower
  4. 1U rack server Correct answer.

Explanation

A 1U rack server occupies one rack unit (1.75 inches) of vertical space in a standard 19-inch rack. Tower and desktop systems are freestanding, and blades install into a blade chassis rather than directly into a rack.

Question 46Server Hardware Components and Architecture

What does the term 'hot-swappable' mean for a server component such as a drive?

  1. It requires a reboot before it can be recognized
  2. It runs at a higher temperature than other components
  3. It can be replaced while the server remains powered and running Correct answer.
  4. It can only be installed at the factory

Explanation

Hot-swappable components can be removed and replaced without powering down the system, which supports uptime during maintenance. The term refers to serviceability while powered, not to operating temperature or factory-only installation.

Question 47Server Hardware Components and Architecture

Which component converts alternating current from the facility into the direct current rails used by server internals?

  1. The power supply unit Correct answer.
  2. The voltage regulator module
  3. The RAID controller
  4. The baseboard management controller

Explanation

The power supply unit performs AC-to-DC conversion and provides the DC rails that feed the server's components. VRMs regulate DC voltages locally on the board, BMCs manage the server, and RAID controllers manage storage.

Question 48Server Hardware Components and Architecture

Which interconnect is commonly used to attach enterprise SAS or SATA drives inside a server chassis?

  1. DIMM slot
  2. LOM connector
  3. PCIe x16 slot
  4. Backplane Correct answer.

Explanation

A drive backplane provides the connectors and signal routing that let drives plug in at the front of the chassis and connect to the storage controller. PCIe slots host expansion cards, DIMM slots hold memory, and LOM connectors are for network modules.

Question 49Server Hardware Components and Architecture

A server has four 8 GB DIMMs installed but the operating system reports only 24 GB usable. Which explanation is most consistent with this observation?

  1. The CPU does not support more than 24 GB
  2. The NIC is consuming memory
  3. The power supply is undersized
  4. One DIMM is faulty or not seated, leaving three modules active Correct answer.

Explanation

If one of four 8 GB modules is not detected, the system would report 24 GB from the remaining three. CPU memory support, power supply sizing, and NICs do not reduce detected memory in this pattern.

Question 50Server Hardware Components and Architecture

What is the main advantage of a blade server architecture compared with multiple standalone rack servers?

  1. Blades eliminate the need for any network connectivity
  2. Each blade includes its own dedicated power supply and fans
  3. Blades run without an operating system
  4. Blades share chassis power, cooling, and networking resources Correct answer.

Explanation

Blade servers install into a shared chassis that provides common power, cooling, and network fabrics, improving density and cable reduction. Blades do not carry their own supplies and fans, and they still require networking and an OS.