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At a retail branch, an implementation partner needs short, high-throughput optical links inside a server room with supported transceivers. During review, someone proposes: "Install single twisted-pair telephone voice cable as a 40G link." Which technical explanation most directly shows why this proposal does not solve the requirement?
Telephone cable lacks the specified Ethernet physical interface. The effective remedy is to use compatible multimode fiber and short-reach optics for the measured run.
Transceivers must support a compatible optical standard. The statement addresses a different mechanism. Here the engineer specifically proposed install single twisted-pair telephone voice cable as a 40g link; the decisive limitation is that telephone cable lacks the specified Ethernet physical interface.
Fiber type and optical module specifications must match. It concerns a different proposed change, not the change being evaluated.
Multimode cabling is common for short high-capacity data-center links within optics limits. A true general network fact is not necessarily the direct diagnosis. The named change was install single twisted-pair telephone voice cable as a 40g link, whose relevant defect is that telephone cable lacks the specified Ethernet physical interface.
At a bank branch, the branch support lead has a new copper endpoint link with an Ethernet port and power provided by a PoE switch. During review, someone proposes: "Use bare single-mode fiber as a powered link." Which technical explanation most directly shows why this proposal does not solve the requirement?
Fiber alone cannot deliver copper PoE to the endpoint. The effective remedy is to use standards-compliant twisted-pair Ethernet within the specified channel distance.
A terminator is not an active twisted-pair Ethernet endpoint. It concerns a different proposed change, not the change being evaluated.
Copper pairs support the access Ethernet and PoE link when category and channel limits are met. A true general network fact is not necessarily the direct diagnosis. The named change was use bare single-mode fiber as a powered link, whose relevant defect is that fiber alone cannot deliver copper PoE to the endpoint.
Console rollover wiring is not a regular Ethernet data interface. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed use bare single-mode fiber as a powered link. The actual issue is that fiber alone cannot deliver copper PoE to the endpoint.
At a logistics provider, the migration lead must troubleshoot a fiber uplink with a vendor-specific optical module at each end. During review, someone proposes: "Change the VLAN native tag before examining physical light levels." Which technical explanation most directly shows why this proposal does not solve the requirement?
VLAN tagging does not address optical module compatibility. The effective remedy is to confirm both optics support the same speed, wavelength, fiber type and reach.
Optical interoperability depends on compatible transceiver parameters and loss budget. This observation would apply to another device or feature, not the proposed change the vlan native tag before examining physical light levels. For this scenario, vLAN tagging does not address optical module compatibility is the direct cause.
Duplex settings cannot make mismatched optics interoperable. It concerns a different proposed change, not the change being evaluated.
Replacing a long optic run with short copper is not a compatible physical plan. The statement addresses a different mechanism. Here the engineer specifically proposed change the vlan native tag before examining physical light levels; the decisive limitation is that vLAN tagging does not address optical module compatibility.
At a retail branch, a network operations engineer sees increasing FCS/CRC errors on a copper switchport after a cable was pinched during rack maintenance. Which choice best addresses the stated requirement?
Damaged pairs and signal integrity issues can corrupt frames and raise CRC/FCS counters.
Subnet masks cannot repair corrupted Ethernet frames.
Logging metadata does not repair the faulty copper path.
Lease timers do not affect electrical errors.
At a hotel, a network operations engineer has one side of a link forced to full duplex while the other uses half duplex, with collisions and poor throughput. Which choice best addresses the stated requirement?
A half/full duplex mismatch can create late collisions and inconsistent performance.
Layer 3 filtering does not solve the physical link negotiation mismatch.
CDP visibility does not determine negotiated link duplex; the mismatch causing errors persists.
A description is documentation, not a speed or duplex command; both link ends still require compatible settings.
At a supply depot, the migration lead finds a newly installed 1-Gbps uplink negotiated at 100 Mbps because the replacement patch cord has damaged pairs. Which choice best addresses the stated requirement?
Gigabit twisted pair requires functioning pairs and supported PHY negotiation.
802.1Q membership does not repair missing cable pairs.
A description does not change actual line rate.
For twisted-pair 1000BASE-T the usable pair count and cable integrity matter; changing a speed setting does not repair insufficient physical pairs.
At a biotech lab, the branch support lead observes an access port with interface status administratively down after a template change. Which choice best addresses the stated requirement?
An administratively disabled port cannot bring the line protocol up until enabled.
An administratively disabled port does not recover by changing the advertised or negotiated physical speed; the shutdown state must be cleared.
Time synchronization has no bearing on shutdown.
CAM aging does not turn an administratively shut port on.
At a design agency, the on-call technician sees high input errors and frequent link resets on an optical trunk following an optic replacement. Which choice best addresses the stated requirement?
Low optical power or incompatible optics can cause frame errors and link instability.
An 802.1Q native-VLAN setting does not repair failing optical receive power or physically mismatched transceivers.
VLAN authorization does not fix optical signal levels.
Default routing is independent of optic signal quality.
At a regional hospital, the infrastructure lead reports throughput collapse and late collisions only on one legacy manually configured Ethernet connection. Which choice best addresses the stated requirement?
Late collisions and asymmetric performance are characteristic evidence for inconsistent duplex.
Monitoring credentials cannot change collision timing.
Hiding counters does not cure link behavior.
ARP entries do not fix a half-duplex Ethernet collision domain.
At a stadium, a network administrator sees increasing FCS/CRC errors on a copper switchport after a cable was pinched during rack maintenance. During review, someone proposes: "Change the advertised subnet mask on the router." Which technical explanation most directly shows why this proposal does not solve the requirement?
Subnet masks cannot repair corrupted Ethernet frames. The effective remedy is to inspect/replace the copper cable and retest interface error counters.
Logging metadata does not repair the faulty copper path. It concerns a different proposed change, not the change being evaluated.
Damaged pairs and signal integrity issues can corrupt frames and raise CRC/FCS counters. This observation would apply to another device or feature, not the proposed change the advertised subnet mask on the router. For this scenario, subnet masks cannot repair corrupted Ethernet frames is the direct cause.
Lease timers do not affect electrical errors. A true general network fact is not necessarily the direct diagnosis. The named change was change the advertised subnet mask on the router, whose relevant defect is that subnet masks cannot repair corrupted Ethernet frames.
At a field-service firm, the campus network lead has one side of a link forced to full duplex while the other uses half duplex, with collisions and poor throughput. During review, someone proposes: "Change only the switch hostname." Which technical explanation most directly shows why this proposal does not solve the requirement?
The name is unrelated to duplex behavior. The effective remedy is to match supported speed and duplex settings at both link ends.
Layer 3 filtering does not solve the physical link negotiation mismatch. It concerns a different proposed change, not the change being evaluated.
Routing advertisements do not eliminate duplex collisions. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed change only the switch hostname. The actual issue is that the name is unrelated to duplex behavior.
A half/full duplex mismatch can create late collisions and inconsistent performance. The statement addresses a different mechanism. Here the engineer specifically proposed change only the switch hostname; the decisive limitation is that the name is unrelated to duplex behavior.
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