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Question 381.

Which server practice helps identify aging components before they cause an outage?

1. Lifecycle monitoring
2. Random hardware replacement
3. Unscheduled application removal
4. Permanent configuration freezing

Correct Answer: 1

Explanation:

Lifecycle monitoring tracks the age, support status, condition, and expected replacement period of server hardware and software. It helps administrators identify equipment approaching the end of its useful or supported life before failures become disruptive. Important lifecycle information can include warranty expiration, vendor support dates, firmware availability, replacement-part availability, and historical failure patterns. Random hardware replacement can increase unnecessary costs, while permanent configuration freezing prevents useful improvements and security updates. Unscheduled application removal does not address infrastructure aging. A documented lifecycle process allows organizations to plan migrations, budget for replacements, and coordinate maintenance before unsupported or unreliable equipment becomes a serious operational risk.

Question 382.

What information is typically maintained in a server CMDB entry?

1. User browsing history
2. Configuration and relationship information
3. Personal entertainment preferences
4. Temporary clipboard contents

Correct Answer: 3

Explanation:

A configuration management database, or CMDB, stores information about configuration items and their relationships within an IT environment. A server entry may contain identifiers, operating-system details, network information, installed services, ownership information, support status, and relationships with applications or other infrastructure components. This information helps administrators understand what a server supports and what could be affected by a change or failure. User browsing history and clipboard contents are unrelated to normal CMDB management. Personal preferences are also outside its purpose. Accurate CMDB data is valuable during incident response, change planning, audits, migrations, and dependency analysis, although organizations must maintain the records carefully to keep them reliable.

Question 383.

Which server document identifies equipment installed at a particular rack position?

1. Incident report
2. Software license
3. Rack elevation diagram
4. Backup manifest

Correct Answer: 2

Explanation:

A rack elevation diagram visually represents equipment placement within a server rack. It can show the rack-unit positions occupied by servers, switches, storage systems, power equipment, and other devices. This documentation helps technicians locate hardware quickly and can support planning for available rack space, cable routing, and equipment replacement. An incident report records an operational event, a software license documents usage rights, and a backup manifest describes protected data or recovery sets. Rack documentation should be updated when equipment is installed, removed, or relocated. Accurate diagrams are particularly useful in data centers where many similar systems are installed across multiple cabinets.

Question 384.

Which environmental condition can increase the risk of condensation inside server equipment?

1. Stable temperature
2. Controlled humidity
3. Sudden temperature change
4. Consistent airflow

Correct Answer: 4

Explanation:

A sudden temperature change can cause moisture to condense when equipment surfaces become cooler than the surrounding air’s dew point. Condensation can create electrical and corrosion risks inside server equipment. Data centers therefore maintain controlled temperature and humidity ranges and avoid conditions that cause rapid thermal transitions. Stable temperature, controlled humidity, and consistent airflow generally support predictable environmental conditions when properly maintained. Administrators should also consider conditions during equipment transportation, installation, or movement between environments because servers may experience temperature differences outside the normal operating room. Allowing hardware to acclimate when appropriate can reduce moisture-related risks.

Question 385.

Which power protection device provides short-term battery power during an electrical outage?

1. UPS
2. Surge-only outlet
3. Circuit breaker
4. Grounding conductor

Correct Answer: 1

Explanation:

An uninterruptible power supply, or UPS, provides temporary electrical power from a battery when the normal electrical source becomes unavailable. This short-term power can keep servers operating long enough for utility power to return or for an orderly shutdown to occur. Depending on its design, a UPS may also provide power conditioning and protection against certain electrical disturbances. A surge-only outlet does not provide battery-backed runtime, while a circuit breaker protects electrical circuits from excessive current and a grounding conductor provides a path for electrical fault conditions. Administrators should size UPS capacity according to connected loads and periodically test battery health to maintain dependable protection.

Question 386.

What does a server’s power supply efficiency rating primarily describe?

1. Number of processor cores
2. Proportion of input power converted for system use
3. Maximum network packet size
4. Available disk partitions

Correct Answer: 3

Explanation:

Power supply efficiency describes how effectively a power supply converts incoming electrical energy into usable output power for the server. Some energy is lost during conversion, primarily as heat. Higher efficiency can reduce wasted electricity and lower the amount of heat that must be removed by the cooling system. Efficiency ratings are therefore relevant to data-center energy consumption and operating costs. Processor core count, packet size, and disk partitions are unrelated characteristics. Administrators should also consider the power supply’s capacity, redundancy, connector requirements, and operating conditions rather than evaluating efficiency alone when selecting replacement units.

Question 387.

Which cable-management practice helps reduce accidental disconnection during maintenance?

1. Increasing cable length unnecessarily
2. Labeling both cable ends
3. Routing every cable across the aisle
4. Removing all cable documentation

Correct Answer: 2

Explanation:

Labeling both ends of a cable makes it easier to identify the destination and source without tracing the entire cable path. This reduces the likelihood of disconnecting the wrong connection during maintenance and can shorten troubleshooting time. Consistent labels are especially useful in densely populated racks where numerous network, storage, and management cables may appear similar. Excessive cable length can complicate routing, while routing cables across access areas can create physical and safety problems. Removing documentation makes maintenance more difficult. Cable labels should use a consistent naming convention that corresponds with diagrams or inventory records so technicians can quickly associate physical connections with documented infrastructure.

Question 388.

Which rack feature helps prevent unauthorized removal of installed equipment?

1. Open shelf design
2. Decorative front panel
3. Lockable rack enclosure
4. Temporary cable tray

Correct Answer: 4

Explanation:

A lockable rack enclosure can restrict physical access to servers and networking equipment. Physical security is important because someone with direct access may disconnect cables, remove storage devices, alter hardware, or otherwise interfere with systems regardless of software security controls. A decorative panel provides appearance benefits but does not necessarily prevent access. An open shelf design and temporary cable tray likewise do not provide meaningful physical access control. Organizations should combine rack security with controlled room access, visitor procedures, equipment monitoring, and appropriate audit practices. Physical protections are particularly important for systems containing sensitive information or infrastructure that supports critical services.

Question 389.

Which server maintenance action helps prevent unexpected service interruption during planned work?

1. Notify affected stakeholders beforehand
2. Change production settings without documentation
3. Disable monitoring alerts permanently
4. Skip validation after maintenance

Correct Answer: 1

Explanation:

Notifying affected stakeholders before planned maintenance helps coordinate operational expectations and reduces confusion when services become temporarily unavailable or behave differently. Proper maintenance communication can include the expected start time, duration, affected services, potential impact, and contact information for the responsible team. Undocumented production changes make troubleshooting more difficult, permanently disabling monitoring removes valuable visibility, and skipping validation can allow problems to remain undetected after maintenance. Effective maintenance also includes approval, preparation, implementation, verification, and rollback planning when appropriate. Communication is therefore an important operational control rather than merely an administrative formality.

Question 390.

Which measurement helps determine whether a server has enough electrical capacity for an added component?

1. DNS record count
2. User login frequency
3. Available power budget
4. Filesystem inode count

Correct Answer: 3

Explanation:

Available power budget indicates how much additional electrical load a server or infrastructure circuit can safely support. Before installing additional processors, drives, accelerators, or other components, administrators should consider their expected power consumption along with existing load and redundancy requirements. Exceeding the available budget can cause power-supply overloads, unexpected shutdowns, or infrastructure failures. DNS record counts, login frequency, and filesystem inode counts do not measure electrical capacity. Power planning should consider normal and peak consumption, power-supply ratings, circuit limits, and redundancy. Proper capacity calculations help prevent hardware expansions from creating an electrical constraint.

Question 391.

Which server metric can reveal that storage requests are waiting unusually long for completion?

1. Disk queue depth
2. CPU socket count
3. DNS cache size
4. User group count

Correct Answer: 2

Explanation:

Disk queue depth indicates how many storage operations are waiting to be processed by the storage subsystem. A persistently elevated queue can indicate that storage demand exceeds the system’s ability to complete requests promptly. Administrators should interpret queue depth together with storage latency, IOPS, throughput, workload type, and device health. A high queue does not automatically prove that a storage device is defective because heavy workloads can legitimately generate many outstanding operations. CPU socket count, DNS cache size, and user group count do not directly measure storage request congestion. Monitoring queue behavior can help identify storage bottlenecks and guide capacity or performance improvements.

Question 392.

What does CPU steal time indicate in a virtualized environment?

1. Time spent compressing application data
2. Time reserved for disk replication
3. Processor time taken by another virtual workload
4. Time required to resolve DNS records

Correct Answer: 4

Explanation:

CPU steal time represents processor time that a virtual machine wanted to use but that the hypervisor assigned to another virtual machine. Sustained elevated steal time can indicate contention for physical CPU resources on the host. This metric is especially useful when investigating virtual machines that appear to have adequate allocated virtual CPUs but still experience inconsistent processing performance. Disk replication, application compression, and DNS resolution do not describe CPU steal time. Administrators can compare steal time with host utilization, virtual CPU allocation, workload placement, and other virtualization metrics to determine whether processor contention is affecting the guest system.

Question 393.

Which server metric measures the amount of data transferred through a network interface over time?

1. Packet loss percentage
2. Network throughput
3. Connection timeout count
4. Interface error total

Correct Answer: 2

Explanation:

Network throughput measures the amount of data successfully transferred through a network connection during a specified period. It is commonly expressed in bits per second or related units. Throughput can help administrators determine whether a server is actually moving data at the expected rate, although the result depends on protocol overhead, workload behavior, congestion, and other factors. Packet loss measures packets that fail to reach their destination, while timeout and error counts describe different network conditions. Administrators should compare throughput with interface capacity, latency, packet loss, and application requirements to determine whether network performance is appropriate for the workload.

Question 394.

Which network condition can cause a server to retransmit TCP segments?

1. Packet loss
2. Excessive disk capacity
3. High memory availability
4. Correct DNS configuration

Correct Answer: 3

Explanation:

Packet loss can cause TCP to retransmit segments when transmitted data is not successfully acknowledged. Retransmissions consume network resources and can increase application response times, particularly when loss occurs repeatedly. Packet loss may result from congestion, damaged cabling, faulty interfaces, wireless interference in applicable environments, or other network problems. High memory availability and disk capacity do not directly cause TCP retransmissions, while correct DNS configuration concerns name resolution. When investigating retransmissions, administrators should examine interface statistics, network paths, switch ports, error counters, and packet captures where appropriate. Identifying the source of loss can help distinguish server-side problems from network infrastructure issues.

Question 395.

Which IPv4 subnet mask corresponds to a /24 network?

1. 255.255.255.0
2. 255.255.0.0
3. 255.255.255.128
4. 255.255.254.0

Correct Answer: 1

Explanation:

A /24 IPv4 prefix contains 24 network bits and 8 host bits. Its dotted-decimal subnet mask is 255.255.255.0. This configuration provides 256 total address values in the subnet, with the usable host range depending on the addressing model and network requirements. A /16 uses 255.255.0.0, while 255.255.255.128 corresponds to /25 and 255.255.254.0 corresponds to /23. Understanding CIDR notation and subnet masks helps administrators design network segments, configure server interfaces, and troubleshoot routing or address-allocation problems. Correct subnetting is particularly important when servers must communicate across multiple network segments.

Question 396.

Which IPv6 address category is intended for communication within a local link?

1. Global unicast
2. Multicast
3. Link-local
4. Loopback

Correct Answer: 4

Explanation:

IPv6 link-local addresses are automatically associated with interfaces and are used for communication on the local network link. They are not intended for routing across different network segments. Link-local addressing is important for IPv6 neighbor discovery and other local communication functions. Global unicast addresses are routable across IPv6 networks, multicast addresses represent groups of receivers, and the loopback address is used by a host to communicate with itself. Administrators troubleshooting IPv6 connectivity should recognize link-local addresses because their presence does not necessarily indicate a globally routable configuration. Understanding address scope helps explain why certain IPv6 communication attempts remain limited to the local segment.

Question 397.

Which DNS record type identifies the mail server responsible for a domain?

1. A
2. MX
3. AAAA
4. PTR

Correct Answer: 2

Explanation:

An MX, or Mail Exchange, record identifies the mail servers responsible for accepting email for a DNS domain. Mail systems query MX records to determine where messages should be delivered. Multiple MX records can be configured with preference values so that sending systems can select an appropriate destination according to the published priorities. A records map names to IPv4 addresses, AAAA records map names to IPv6 addresses, and PTR records are commonly used for reverse DNS lookups. Administrators troubleshooting email delivery should verify MX records along with the referenced host addresses, DNS availability, mail-server configuration, and relevant authentication or security records.

Question 398.

Which DNS mechanism specifies how long a cached record may normally be retained?

1. SOA serial
2. Record priority
3. TTL
4. Zone transfer key

Correct Answer: 3

Explanation:

TTL, or Time to Live, specifies how long a DNS record can normally remain cached before a resolver should query again for updated information. A shorter TTL can allow changes to propagate more quickly, while a longer TTL can reduce repeated DNS queries and improve caching efficiency. TTL should be selected according to the stability and operational requirements of the record. An SOA serial identifies a version of zone information, record priority has specialized uses such as MX ordering, and a transfer key can protect zone-transfer operations. Understanding TTL is important when troubleshooting DNS changes that appear inconsistent across different clients or locations.

Question 399.

Which security control records privileged command execution on a Linux server?

1. Command auditing
2. Screen resolution policy
3. Desktop wallpaper control
4. Printer queue management

Correct Answer: 4

Explanation:

Command auditing records information about administrative or privileged command execution, depending on the auditing framework and configuration. This can provide useful evidence for troubleshooting, accountability, security investigations, and compliance requirements. Effective auditing may capture the identity of the user, executed command, timestamp, and other contextual information. Screen resolution, desktop wallpaper, and printer queue settings are unrelated to privileged command tracking. Administrators should protect audit records from unauthorized modification and establish suitable retention policies. Auditing should also be balanced with privacy and operational requirements. Reliable command records can help determine what actions occurred on a server when investigating unexpected configuration or security changes.

Question 400.

Which planning activity estimates future server resources based on expected workload growth?

1. Incident response
2. Capacity planning
3. Certificate enrollment
4. Hardware disposal

Correct Answer: 2

Explanation:

Capacity planning estimates future resource requirements by analyzing current utilization, historical trends, business growth, application demand, and expected workload changes. Administrators can use this process to determine when additional processor capacity, memory, storage, network bandwidth, or other infrastructure resources may be required. Effective capacity planning helps avoid both resource shortages and unnecessary overprovisioning. Incident response focuses on handling operational problems, certificate enrollment manages digital identity credentials, and hardware disposal concerns equipment retirement. Capacity planning should use measurable performance data and realistic growth assumptions. Regular reviews are important because workload patterns can change significantly as applications, users, and business requirements evolve.