Google Data Center Technician Practice Exam

These questions are part of the practice quiz. Start practicing

• What are temperature sensors?
• Which statement about read errors is most accurate?
• What is color coding used for in a data center?
• To identify a runaway process, which approach is recommended?
• What is the primary safety or maintenance reason for ensuring proper bend radius in fiber installations?
• What is LLDP (Link Layer Discovery Protocol) used for?
• What is out-of-band (OOB) network?
• Which tool is used to test path and latency to a host?
• Which service assigns IP addresses automatically in a network?
• Which term describes a hardware module used for secure key storage and attestation?
• What does cable dressing entail and why is it important?
• What is spare-part FRU tracking?
• What does an increasing Reallocated_Sector_Ct mean?
• What is Wear_Leveling_Count (SSDs)?
• What is firmware baseline compliance?
• What does POST do?
• Which statement best describes the default gateway?
• What is Reallocated_Sector_Ct (ID 5)?
• An UNC error indicates which of the following?
• What causes write errors in SMART logs?
• Which condition signals wear-out in an SSD?
• What command shows SMART self-test history?
• Which component provides Ethernet connectivity?
• What tool should you use to check a drive behind a RAID controller?
• Which command runs a short SMART test on a device?
• Which approach is recommended to automate basic triage?
• What does a long SMART test check?
• Which method is recommended to quickly collect logs for incident analysis?
• Which command reveals inode depletion?
• Which statement correctly describes how to check SMART test progress during a run?
• What does a non-zero Reallocated_Sector Count mean?
• Which statement best describes LLDP's function?
• Which command lists listening ports and owning processes?
• Which command shows the size of a directory in a human-readable form?
• What is a cable management arm (CMA) used for?
• Which description matches the output of df -h?
• Why use Velcro not zip ties?
• How should shift work be handled safely?
• How to fix UDMA CRC Errors?
• Which method helps identify recent changes to a configuration file?
• What is the purpose of the inspect-clean-inspect sequence?
• Which command shows recent logs for a specific systemd service?
• Which statement best explains the purpose of cable labeling and port mapping?
• Should you rely on normalized VALUE alone?
• In network architectures, how are underlay and overlay related?
• How can you quickly identify bad blocks on a drive?
• What is the recommended action when the drive surface is deteriorating?
• What is label source of truth?
• What is autonegotiation designed to do on a link?
• Which connector is duplex and commonly used for simple fiber links?
• If VALUE < THRESH, what does that indicate?
• What distinguishes RDIMMs from LRDIMMs?
• Which command would you use to display only the health status of a drive?
• What does a Pre-Fail attribute type mean?
• Which is a typical warning sign before drive failure?
• In practice, SMART checks in a data center are typically performed as part of which workflow?
• Which feature limits which MAC addresses can use a port and prevents unauthorized devices?
• What does 'Completed with read failure' mean?
• What is spare‑part FRU tracking (recording field-replaceable unit serials/locations to maintain inventory accuracy and auditability)?
• What is an OCP NIC?
• What is port-channel hashing used for in a switch or NIC team?
• What is a breakout cable and what does it do?
• If SMART logs show pattern of errors concentrated at higher LBA addresses that increases over time, what does this indicate?
• What is the typical bend radius rule for fiber cables?
• Which attribute type indicates imminent hardware failure for SMART?
• When is a SMART test insufficient?
• Which command provides extended I/O statistics for storage devices, including utilization and wait time, with one‑step depth?
• How can you monitor a running SMART test?
• Which expansion interface is used to connect devices like NICs, HBAs, RAID cards, GPUs, and accelerators?
• Which scenario indicates immediate replacement for the disk?
• What is a CPU socket?
• Which statement best describes asymmetric routing in a network?
• Which statement best describes the primary purpose of reading SMART logs?
• DBD handling refers to...
• What does MTU stand for, and what happens when frames exceed it due to mismatch?
• If CRC errors are increasing, what is the likely root cause?
• What does an Old-Age attribute type mean?
• What is a maintenance window?
• Which trend is a clear warning sign before drive failure?
• Lockout/tagout (LOTO) primarily ensures safety by preventing what during maintenance?
• What is an 'Offline data collection status'?
• What is a drive caddy/carrier?
• Which counters are useful when reading interface counters to diagnose issues?
• Which command runs a long/extended SMART test?
• DAC vs AOC: when and why to choose?
• If Spin Retry Count is increasing, what action is usually recommended?
• Which command maps a port to the owning process?
• On duplex LC fiber, what does polarity refer to?
• How should tickets be prioritized?
• Which of the following is best practice when SMART indicates potential issues?
• Which command would you use to obtain the version information for a loaded driver module?
• Which statement best describes the System Event Log (SEL)?
• What is a GPU/Accelerator?
• DNS resolves names to IP addresses using which records?
• If SMART output shows High UDMA_CRC_Error_Count but zero reallocated sectors, what does this indicate?
• What is a mezzanine card?
• Which is NOT part of data-bearing device handling (DBD)?
• Which command displays distribution and version details of the OS?
• A high Seek Error Rate most directly suggests which issue?
• Which transport protocol is best suited for reliable, ordered delivery over an unreliable network?
• Which term describes a hardware module designed to securely store keys and enable attestation?
• Which statement defines underlay and overlay networks?
• What is UDMA_CRC_Error_Count (ID 199) associated with?
• What is a key benefit of AOC for longer runs compared to DAC?
• Which statement best describes SMART's predictive capability?
• What is Equal‑Cost Multi‑Path routing (ECMP) primarily used for in networks?
• What is a trunk port?
• How long is a typical short SMART test?
• Which of the following best describes a high Reallocated Event Count?
• What method should be used to read hardware events from the SEL when the operating system cannot access them?
• What is an internal USB/SD boot module used for in some server designs?
• What is TCP vs UDP difference?
• A rising Spin Retry Count is most likely to indicate what?
• What is the native VLAN on a trunk?
• What does a route table define?
• Which of the following is a filler panel used in empty rack spaces?
• What is a backplane/midplane?
• Non-zero Current Pending Sectors imply what?
• What is a SMART-enabled proactive replacement?
• MPO polarity A/B/C defines what aspect?
• What is a chipset?
• If SMART overall-health self-assessment test result is FAILED, what should you do?
• NVMe provides which of the following benefits over traditional storage interfaces?
• What is a CPU heatsink?
• How to quickly test L3 reachability?
• Where would kernel-level ECC corrections or uncorrectable memory errors be reported?
• Which component is responsible for memory error detection and correction?
• Which SMART attribute is most directly used to monitor wear on SSDs?
• What is a blanking panel?
• Which enclosure houses multiple blade servers sharing power and cooling?
• Can SMART predict every failure?
• Which statement about MPO trunks is true?
• What is the primary role of a route table in IP networking?
• Which action is recommended to recover from a kernel panic loop?
• What is a PSU?
• Which indicator most directly signals imminent SSD wear-out?
• What is the typical troubleshooting order when diagnosing issues across network layers?
• What is a motherboard?
• What is the main limitation of SMART as described?
• What is an 'UNC' error?
• What is the use of an optical power meter?
• What is the default gateway?
• What does the THRESH column represent?
• Which command shows the status of a systemd service?
• Which attribute type indicates normal wear-related attribute; not necessarily critical?
• The Self-test execution status indicates what about a SMART self-test?
• What does Seek Error Rate describe?
• What is NVRAM/Boot ROM?
• Which statement about 802.1Q tagging and trunk ports is correct?
• In evaluating FEC, if you see FEC corrected errors but no uncorrected errors, what does that indicate?
• Which practice helps maintain system stability and security by using approved firmware versions?
• Which component provides dedicated memory sockets for RAM modules on the motherboard?
• Riser cards are used to re-route PCIe slots to different orientations for density or multi-slot access.
• How to isolate DNS vs. network issues?
• Which statement best describes the breakout cable's role in port provisioning?
• Which command shows the overall SMART health status for a drive?
• Which statement best describes the function of an ACL?
• Why keep cold aisle doors closed?
• Do SSDs fail differently than HDDs?
• Which description defines a converged or hyper-converged node?
• Which indicators suggest a fiber cleanliness issue?
• Why do RAW values differ by manufacturer?
• What is a SMART 'self-test log error count'?
• Which statement about jumbo frames is true?
• What does repeated SMART error entries indicate?
• Which device is used for remote server management independent of the OS?
• What SMART metric is linked to SSD write endurance?
• What is the best indicator of drive survival?
• What does End-to-End Error indicate?
• What is Current_Pending_Sector (ID 197)?
• What is a CPU?
• Which command lists all currently loaded kernel modules?
• Which command shows per-network interface statistics, including RX and TX counters and errors?
• Which command filters logs by time when creating a support bundle?
• What is power budget/derating?
• What is a RAID controller?
• What is the role of BGP in data center fabrics with leaf-spine/EVPN?
• What is thermal interface material (TIM)?
• Rack rails are primarily used to do which of the following?
• The Read Error Rate metric is described as vendor-specific. What does that imply?
• Which command prints kernel messages with human-readable timestamps for easier interpretation?
• What is loopback address for testing?
• What is a MAC table?
• CRC or FCS errors indicate what type of issue on a network link?
• What are PCIe slots used for?
• Which commands help distinguish between a full filesystem and inode exhaustion?
• Which component describes a cable management arm (CMA)?
• Which command shows details and versions for a specific kernel module?
• Which scenario describes a consequence of stale ARP cache entries?
• What does UEFI Secure Boot do?
• Which statement best describes what mtr does?
• What is a KVM module?
• What is the purpose of Spanning Tree Protocol (STP) in a switched network?
• If SMART logs are empty, which statement could be true?
• What does RX optical power refer to?
• Which approach helps isolate an OS vs hardware fault?
• What is the characteristic benefit of a routed ToR design?
• Which sequence is correct for a STAR story?
• Which condition best indicates a drive is nearing failure, prompting proactive action?
• Which command remounts the filesystem as read-write after resolving underlying issues?
• What is PSU redundancy?
• Which tool is recommended to read hardware events outside the OS for SEL?
• Which command shows errors since last boot?
• What are DIMM slots?
• What is a Time-Domain Reflectometer (TDR) test on copper used for?
• Which component enables the CPU to communicate with I/O devices and storage, managing PCIe lanes?
• Which command shows SMART device information on a Linux system?
• What is a CPU fan module?
• If SMART logs show no errors but OS shows I/O errors, what could be the problem?
• Which command can be used to perform DNS resolution for a hostname?
• What is the primary difference between SMF and MMF?
• Which term describes a management network path separate from production data for remote control?
• What is a THA/JHA?
• Why label both ends of a cable?
• Which components are included in a typical support bundle?
• What is a VLAN?
• What does Temperature_Celsius (ID 194) track?
• Which factor commonly leads to link flapping on a fiber optic link?
• Which command combination would help check NIC errors and detailed statistics including FEC/CRC?
• In a duplex LC fiber link, what does flipping polarity accomplish when incorrect polarity causes no light on straight-through?
• What does 'Self-test execution status' show?
• What is an access port?
• How can you tell SMART is enabled on a drive from the command output?
• What describes front-to-back airflow in data centers?
• What can cause read errors in SMART logs?
• After identifying a runaway process, what is a prudent first step to terminate it gracefully?
• Should you back up data when SMART errors appear?
• Which action would best help determine where path divergence occurs when testing reachability?
• Which SMART column matters most for actual errors?
• How do RAW_VALUE and VALUE differ in reliability for assessment?
• What does DHCP provide?
• Which command tails a log file in real time?
• What do SMART error logs show?
• How should you gracefully shut down a hung server?
• Can a drive fail without SMART warnings?
• Which SMART attribute ID tracks drive temperature?
• Which command would you use to view the SMART error log for a device such as /dev/sda?
• What does SMART FAILED indicate?
• Why run SMART tests during off-hours?
• What does rising CRC error count usually indicate?
• NVMe is a protocol designed for SSDs that operates over which interface?
• Which command reads error logs from the previous boot to diagnose boot failures?
• Which command quickly finds files larger than 1 gigabyte and prints their path and size in kilobytes?
• During troubleshooting, which layer is responsible for routing, ACLs, MTU, and DNS?
• What causes Offline_Uncorrectable sectors?
• In a data center fabric using BGP with EVPN, what is the primary role?
• After starting a long SMART self-test, where should you review results?
• What does increasing LBA error patterns indicate?
• What is Power_On_Hours (ID 9)?
• What happens when auto-negotiation is enabled and devices negotiate speed and duplex?
• Which command displays network interfaces and their IP addresses?
• What does a good STAR story structure include?
• Which command provides a list of block devices with their filesystem types?
• Best practice for documentation?
• What does SMART PASSED indicate?
• What does DNS do?
• What does non-zero Current Pending Sectors indicate?
• Which command can display the route taken to a destination and the latency at each hop?
• Which statement about a switch port configured as an access port is true?
• What is memory channel architecture?
• How to validate LACP state?
• Which command shows the system's current routing table?
• What causes SMART logs to be empty?
• What are HDDs vs. SSDs?
• In a redundant PSU setup, what is the purpose of having a spare unit?
• In dense server environments, which component is commonly used to enable compute acceleration via PCIe or mezz hardware?
• Which command shows NTP status and clock source?
• The Offline data collection status in SMART monitoring refers to what?
• In inventory management, spare-part FRU tracking primarily involves which practice?
• In the context of disk health metrics, what does the VALUE column represent?
• What is Offline_Uncorrectable (ID 198)?
• What does SMART 'Read Error Rate' track?
• What does 'Completed without error' mean in a self-test?
• What is the consequence of not using a blanking panel in a densely populated rack?
• What are cage nuts and rails?
• Which command shows filesystem capacity in a human-readable form?
• In SMART attributes, which value indicates the count of real-world errors?
• Why use pre/post-change evidence?
• What is a jumbo frame?
• A converged or hyper-converged node is best described as?
• What is hot-swap capability?
• If a SMART attribute VALUE is below THRESH, what is the recommended action?
• What is Path MTU Discovery (PMTUD) and what can break it?
• How should VLAN tagging from host be validated if hardware offloads VLAN tagging?
• Which command shows active mounts and where they are mounted from?
• Which statement best describes SMART's role in disk maintenance?
• Which command provides live resource monitoring for CPU and RAM usage with an interactive interface?
• What is Forward Error Correction (FEC) primarily used for on high-speed optical links?
• Which IEEE optical form factors are commonly used for 100G/400G, each with specific fiber types and FEC needs?
• Which command sequence forces a NIC to renegotiate?
• Which SMART attribute trend is commonly used to justify proactive replacement due to wear-out?
• What is a cable matrix used for?
• Which tool verifies file integrity against a known baseline?
• Which feature is used to combine multiple physical links into a single logical link for bandwidth and redundancy?
• What command shows recent SMART error logs?
• Which component is the main enclosure that supports mounting, airflow, and security?
• Which OS-side indicator suggests memory DIMM issues?
• What topology does a routed ToR design aim to reduce fault domains in?
• What is a SMART trip?
• Lockout/tagout (LOTO) is...
• What is described by a link budget in optical networks?
• What should be included in an escalation message to the next team?
• Which condition breaks Path MTU Discovery in practice?
• What are rack rails used for?
• Which command shows drive capabilities?
• What is NVMe?
• Which attribute best indicates drive deterioration due to media damage?
• Which command shows the full SMART attributes?
• What is the primary purpose of SMART's firmware-level monitoring?
• What does the TYPE column represent?
• What is the purpose of Link Aggregation Control Protocol (LACP)?
• What command enables SMART on a Linux disk?
• What is a fan tray/module?
• What SMART value tracks SSD write wear?
• Which part sits on the motherboard and can host the processor?
• If a drive shows a SMART FAILED status, what action is typically recommended?
• Why check SMART after replacing cables?
• Which statement best defines Spin Retry Count?
• Which description matches a blade chassis?
• Which of the following describes the KVM module's function?
• Which action is recommended when a SMART test reports unreadable sectors?
• Which option describes an NVMe backplane with a switch?
• What is the purpose of status LEDs in a server component?
• What is a TPM?
• What does uname -a show?
• Which SMART attribute tracks NAND wear and endurance consumption?
• Which command reads SMART attributes for a disk?
• Which feature ensures only signed bootloaders and kernels run to protect against rootkits?
• What is an ACL?
• Which command shows hardware messages with human‑readable timestamps and filters for error, fail, link, or timeout events?
• What is a BMC?
• Which command tests MTU issues on jumbo networks by attempting a destination path with a large payload?
• Which symptom best indicates a duplex mismatch on a copper link?
• Which metric indicates unreadable sectors waiting for remap?
• Which command helps view storage latency spikes by showing extended I/O statistics per device?
• Which metric indicates progressive failure requiring drive replacement?
• Which command would you use to identify the current top CPU-consuming process in real time?
• Which memory module reduces electrical load for larger capacities?
• What benefit does keeping cold aisle doors closed provide in data center cooling?
• What does the SMART attribute Reallocated_Event_Count measure?
• What describes the ARP cache (neighbor table)?
• What should be included when documenting work to ensure effective records?
• What is the best general practice when SMART reports errors?
• What is RAID 10?
• What does LBA stand for in SMART logs?
• Which statement best describes color coding in a data center?
• What happens in a CAM table overflow?
• What does ARP stand for?
• What constitutes a SMART attribute threshold breach?
• What is ECC memory?
• What does SMART stand for in the context of disk health monitoring?
• What does a successful ping to 127.0.0.1 confirm?
• Which components are included in handling data-bearing devices (DBD)?
• What should be included when escalating a problem effectively?
• LC vs MPO connectors -- which statement is accurate?
• What is cable labeling & port mapping?
• What causes intermittent flaps on AOCs?
• What is a server chassis?
• What is a NIC?
• When should an optic be replaced?