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Question 220
A 170m copper run is expected to carry standard gigabit Ethernet without repeaters. What should be investigated?
- Port and cable documentation
- Copper speed and channel validation
- Rack and airflow verification
- Installation validation checklist
Explanation
Correct Answer
B:Copper physical standards limit reliable channel distance. Copper cabling category, distance and negotiated speed must suit the intended Ethernet service.
Incorrect Answers
A:Labeling and as-built records identify exact switch and neighbor interfaces for serviceability. But this does not address the case requirement to respect rated copper link characteristics.
C:Supported rack spacing, air direction and ambient limits are required for reliable hardware operation. But this does not address the case requirement to respect rated copper link characteristics.
D:Link, alarms, power and environmental checks provide evidence before handover. But this does not address the case requirement to respect rated copper link characteristics.
Question 221
During a failure nobody knows whether interface 1/1/48 lands on core-A or core-B. What artifact was omitted?
- Independent power and grounding
- Fiber optic compatibility
- Port and cable documentation
- Copper speed and channel validation
Explanation
Correct Answer
C:Port and cable maps identify endpoints and physical diversity. Labeling and as-built records identify exact switch and neighbor interfaces for serviceability.
Incorrect Answers
A:Correct supplies and independent power feeds mitigate environmental failures where supported. But this does not address the case requirement to trace installed links accurately.
B:Transceiver speed, wavelength and cable type must match peer and distance specifications. But this does not address the case requirement to trace installed links accurately.
D:Copper cabling category, distance and negotiated speed must suit the intended Ethernet service. But this does not address the case requirement to trace installed links accurately.
Question 222
A contractor declares a switch live without checking supply alarms or link counters. What acceptance process is required?
- Independent power and grounding
- Port and cable documentation
- Installation validation checklist
- Fiber optic compatibility
Explanation
Correct Answer
C:Installation validation records prove physical readiness. Link, alarms, power and environmental checks provide evidence before handover.
Incorrect Answers
A:Correct supplies and independent power feeds mitigate environmental failures where supported. But this does not address the case requirement to complete physical post-install checks.
B:Labeling and as-built records identify exact switch and neighbor interfaces for serviceability. But this does not address the case requirement to complete physical post-install checks.
D:Transceiver speed, wavelength and cable type must match peer and distance specifications. But this does not address the case requirement to complete physical post-install checks.
Question 223
An optic reports low receive power after the fiber path was extended. What should be verified?
- Fiber optic compatibility
- Installation validation checklist
- Rack and airflow verification
- Port and cable documentation
Explanation
Correct Answer
A:Optical attenuation must meet the receiver budget. Transceiver speed, wavelength and cable type must match peer and distance specifications.
Incorrect Answers
B:Link, alarms, power and environmental checks provide evidence before handover. But this does not address the case requirement to match optics to measured path losses.
C:Supported rack spacing, air direction and ambient limits are required for reliable hardware operation. But this does not address the case requirement to match optics to measured path losses.
D:Labeling and as-built records identify exact switch and neighbor interfaces for serviceability. But this does not address the case requirement to match optics to measured path losses.
Question 224
A cabinet exceeds rated temperature during summer but has plenty of rack slots. Which requirement is violated?
- Installation validation checklist
- Independent power and grounding
- Rack and airflow verification
- Fiber optic compatibility
Explanation
Correct Answer
C:Thermal limits are independent of mechanical space. Supported rack spacing, air direction and ambient limits are required for reliable hardware operation.
Incorrect Answers
A:Link, alarms, power and environmental checks provide evidence before handover. But this does not address the case requirement to meet rated ambient cooling limits.
B:Correct supplies and independent power feeds mitigate environmental failures where supported. But this does not address the case requirement to meet rated ambient cooling limits.
D:Transceiver speed, wavelength and cable type must match peer and distance specifications. But this does not address the case requirement to meet rated ambient cooling limits.
Question 225
Two aggregate uplinks are documented with identical labels despite connecting to different devices. What should be improved?
- Port and cable documentation
- Fiber optic compatibility
- Independent power and grounding
- Installation validation checklist
Explanation
Correct Answer
A:Unique port identifiers are fundamental to troubleshooting. Labeling and as-built records identify exact switch and neighbor interfaces for serviceability.
Incorrect Answers
B:Transceiver speed, wavelength and cable type must match peer and distance specifications. But this does not address the case requirement to keep accurate link inventory and cabling labels.
C:Correct supplies and independent power feeds mitigate environmental failures where supported. But this does not address the case requirement to keep accurate link inventory and cabling labels.
D:Link, alarms, power and environmental checks provide evidence before handover. But this does not address the case requirement to keep accurate link inventory and cabling labels.
Question 226
Twenty security cameras require 25W each but the selected switch has 370W total PoE. What constraint matters?
- Per-port power class negotiation
- Powered device cable qualification
- Redundant PSU power behavior
- Available PoE system budget
Explanation
Correct Answer
D:Concurrent planned draw exceeds available PoE budget. Total simultaneous draw must remain within the switch's supported deliverable power.
Incorrect Answers
A:An individual interface must support the endpoint's IEEE PoE classification. But this does not address the case requirement to provide enough system-level PoE wattage.
B:Copper quality and length affect Ethernet power and data delivery. But this does not address the case requirement to provide enough system-level PoE wattage.
C:Power supply failure can affect available PoE headroom unless redundancy is designed appropriately. But this does not address the case requirement to provide enough system-level PoE wattage.
Question 227
A high-power AP needs 802.3bt but an older edge port supports only a lower class. What should be checked?
- Powered device cable qualification
- Available PoE system budget
- Per-port power class negotiation
- Redundant PSU power behavior
Explanation
Correct Answer
C:Port-level class support is separate from total budget. An individual interface must support the endpoint's IEEE PoE classification.
Incorrect Answers
A:Copper quality and length affect Ethernet power and data delivery. But this does not address the case requirement to provide the correct per-interface PoE mode.
B:Total simultaneous draw must remain within the switch's supported deliverable power. But this does not address the case requirement to provide the correct per-interface PoE mode.
D:Power supply failure can affect available PoE headroom unless redundancy is designed appropriately. But this does not address the case requirement to provide the correct per-interface PoE mode.
Question 228
A PoE camera resets on an unusually long poor-quality cable while nearby units work. What physical test helps?
- Redundant PSU power behavior
- Powered device cable qualification
- Multi-gigabit transceiver or port choice
- Available PoE system budget
Explanation
Correct Answer
B:Cable condition can affect both power and Ethernet service. Copper quality and length affect Ethernet power and data delivery.
Incorrect Answers
A:Power supply failure can affect available PoE headroom unless redundancy is designed appropriately. But this does not address the case requirement to validate cable length and pair integrity.
C:AP or server links require supported negotiated Ethernet speed rather than just adequate PoE power. But this does not address the case requirement to validate cable length and pair integrity.
D:Total simultaneous draw must remain within the switch's supported deliverable power. But this does not address the case requirement to validate cable length and pair integrity.
Question 229
All phones power off after one PSU fails although chassis remains running. Which design element was insufficient?
- Multi-gigabit transceiver or port choice
- Redundant PSU power behavior
- Available PoE system budget
- PoE and link operational verification
Explanation
Correct Answer
B:Power redundancy must preserve the required powered-device capacity. Power supply failure can affect available PoE headroom unless redundancy is designed appropriately.
Incorrect Answers
A:AP or server links require supported negotiated Ethernet speed rather than just adequate PoE power. But this does not address the case requirement to retain adequate PoE under a single-supply fault.
C:Total simultaneous draw must remain within the switch's supported deliverable power. But this does not address the case requirement to retain adequate PoE under a single-supply fault.
D:Observed power status, LLDP information and port counters prove correct service. But this does not address the case requirement to retain adequate PoE under a single-supply fault.
Question 230
A high-density AP gets sufficient wattage but its upstream throughput is limited to 1G. What extra port feature matters?
- Powered device cable qualification
- Multi-gigabit transceiver or port choice
- Available PoE system budget
- Per-port power class negotiation
Explanation
Correct Answer
B:PoE power does not imply multi-gigabit data capability. AP or server links require supported negotiated Ethernet speed rather than just adequate PoE power.
Incorrect Answers
A:Copper quality and length affect Ethernet power and data delivery. But this does not address the case requirement to select the necessary wired link speed.
C:Total simultaneous draw must remain within the switch's supported deliverable power. But this does not address the case requirement to select the necessary wired link speed.
D:An individual interface must support the endpoint's IEEE PoE classification. But this does not address the case requirement to select the necessary wired link speed.
HPE Network Switching Professional (HPE7-A08) Practice Tests