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Question 640
An access port remains up while FCS errors grow by thousands per minute and file transfers retry. Which evidence points to the cause?
- Unsupported transceiver mode
- Late collisions or duplex mismatch
- Increasing CRC or FCS errors
- Optical receive power too low
Explanation
Correct Answer
C:CRC/FCS corruption indicates frame-level integrity loss. Corrupt frame counters reveal a physical or signal integrity problem even if carrier stays up.
Incorrect Answers
A:A module operating outside the supported platform/media/speed combination can destabilize a physical channel. But this does not address the case requirement to identify signal or media errors.
B:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to identify signal or media errors.
D:Receiver light below specification indicates excessive attenuation, damaged fiber or incompatible optics. But this does not address the case requirement to identify signal or media errors.
Question 641
A new 25G optical link has -20dBm receive power below supported threshold. What explains the intermittent throughput?
- Intermittent link flap
- Optical receive power too low
- Increasing CRC or FCS errors
- Exhausted physical interface bandwidth
Explanation
Correct Answer
B:The receiver lacks adequate optical power for a stable signal. Receiver light below specification indicates excessive attenuation, damaged fiber or incompatible optics.
Incorrect Answers
A:Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence. But this does not address the case requirement to identify an optical power budget shortfall.
C:Corrupt frame counters reveal a physical or signal integrity problem even if carrier stays up. But this does not address the case requirement to identify an optical power budget shortfall.
D:A sustained rate at port line speed with egress drops implies oversubscription. But this does not address the case requirement to identify an optical power budget shortfall.
Question 642
A legacy copper device runs forced full duplex against a half-duplex peer; collision counters grow. What mismatch fits?
- Late collisions or duplex mismatch
- Unsupported transceiver mode
- Intermittent link flap
- Exhausted physical interface bandwidth
Explanation
Correct Answer
A:The endpoints disagree on duplex behavior. Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput.
Incorrect Answers
B:A module operating outside the supported platform/media/speed combination can destabilize a physical channel. But this does not address the case requirement to identify Ethernet duplex incompatibility.
C:Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence. But this does not address the case requirement to identify Ethernet duplex incompatibility.
D:A sustained rate at port line speed with egress drops implies oversubscription. But this does not address the case requirement to identify Ethernet duplex incompatibility.
Question 643
A clean 10G interface carries 10Gbps continuously and output discards rise. Which capacity issue dominates?
- Exhausted physical interface bandwidth
- Late collisions or duplex mismatch
- Intermittent link flap
- Unsupported transceiver mode
Explanation
Correct Answer
A:The link has reached its egress bandwidth ceiling. A sustained rate at port line speed with egress drops implies oversubscription.
Incorrect Answers
B:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to identify congestion rather than CRC errors.
C:Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence. But this does not address the case requirement to identify congestion rather than CRC errors.
D:A module operating outside the supported platform/media/speed combination can destabilize a physical channel. But this does not address the case requirement to identify congestion rather than CRC errors.
Question 644
BGP resets happen every few minutes when the physical uplink drops and recovers. What underlying instability is important?
- Exhausted physical interface bandwidth
- Intermittent link flap
- Optical receive power too low
- Late collisions or duplex mismatch
Explanation
Correct Answer
B:Carrier flapping interrupts sessions and peer stability. Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence.
Incorrect Answers
A:A sustained rate at port line speed with egress drops implies oversubscription. But this does not address the case requirement to diagnose repeated physical link transitions.
C:Receiver light below specification indicates excessive attenuation, damaged fiber or incompatible optics. But this does not address the case requirement to diagnose repeated physical link transitions.
D:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to diagnose repeated physical link transitions.
Question 645
An unsupported optic works after boot but resets with firmware updates. What compatibility issue might account for the behavior?
- Late collisions or duplex mismatch
- Increasing CRC or FCS errors
- Unsupported transceiver mode
- Intermittent link flap
Explanation
Correct Answer
C:The transceiver lacks a supported operating mode for the release and slot. A module operating outside the supported platform/media/speed combination can destabilize a physical channel.
Incorrect Answers
A:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to identify optical module support risk.
B:Corrupt frame counters reveal a physical or signal integrity problem even if carrier stays up. But this does not address the case requirement to identify optical module support risk.
D:Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence. But this does not address the case requirement to identify optical module support risk.
Question 646
Users report poor file transfer performance, but utilization is modest and the uplink CRC count steadily increases. What is the likely layer?
- Unsupported transceiver mode
- Intermittent link flap
- Late collisions or duplex mismatch
- Increasing CRC or FCS errors
Explanation
Correct Answer
D:Corrupt Ethernet frames point to physical-medium problems. Corrupt frame counters reveal a physical or signal integrity problem even if carrier stays up.
Incorrect Answers
A:A module operating outside the supported platform/media/speed combination can destabilize a physical channel. But this does not address the case requirement to explain low throughput from L1 corruption.
B:Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence. But this does not address the case requirement to explain low throughput from L1 corruption.
C:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to explain low throughput from L1 corruption.
Question 647
A long fiber span reads far below normal receiver light levels, and errors are worst at peak heat. Which input should guide root cause?
- Late collisions or duplex mismatch
- Intermittent link flap
- Optical receive power too low
- Increasing CRC or FCS errors
Explanation
Correct Answer
C:Inspect attenuation and optical receive threshold against specification. Receiver light below specification indicates excessive attenuation, damaged fiber or incompatible optics.
Incorrect Answers
A:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to identify poor optical budget.
B:Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence. But this does not address the case requirement to identify poor optical budget.
D:Corrupt frame counters reveal a physical or signal integrity problem even if carrier stays up. But this does not address the case requirement to identify poor optical budget.
Question 648
A switch uptime is weeks but the affected interface transitions down/up 200 times. Which symptom explains session disruptions?
- Optical receive power too low
- Exhausted physical interface bandwidth
- Intermittent link flap
- Late collisions or duplex mismatch
Explanation
Correct Answer
C:Interface flaps can reset ongoing conversations independently of device uptime. Repeated carrier transitions break long-lived sessions and force routing or neighbor reconvergence.
Incorrect Answers
A:Receiver light below specification indicates excessive attenuation, damaged fiber or incompatible optics. But this does not address the case requirement to identify per-port instability.
B:A sustained rate at port line speed with egress drops implies oversubscription. But this does not address the case requirement to identify per-port instability.
D:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to identify per-port instability.
Question 649
A newly connected unmanaged switch creates two cable paths, broadcast traffic spikes and latency becomes unusable. What cause best fits?
- Unknown unicast flooding
- Broadcast storm from accidental loop
- Repeated spanning-tree topology changes
- Unnecessary wide VLAN extension
Explanation
Correct Answer
B:An unintended Ethernet loop amplifies flooded traffic. A Layer 2 loop can amplify flooded frames and consume capacity and switch processing.
Incorrect Answers
A:Absent learned MAC destinations cause frames to be flooded over eligible VLAN ports. But this does not address the case requirement to identify a broadcast storm triggered by a loop.
C:Frequent MSTP topology changes may flush forwarding state and cause transient flooding. But this does not address the case requirement to identify a broadcast storm triggered by a loop.
D:A VLAN extended over too many links increases the blast radius of broadcast and topology events. But this does not address the case requirement to identify a broadcast storm triggered by a loop.
Question 650
After a spanning-tree root change every few seconds, hosts see brief gaps and MAC tables churn. Which mechanism is implicated?
- Repeated spanning-tree topology changes
- Unnecessary wide VLAN extension
- MAC address flapping between ports
- Unknown unicast flooding
Explanation
Correct Answer
A:Frequent topology changes cause forwarding relearning and temporary disruption. Frequent MSTP topology changes may flush forwarding state and cause transient flooding.
Incorrect Answers
B:A VLAN extended over too many links increases the blast radius of broadcast and topology events. But this does not address the case requirement to identify MSTP topology instability.
C:The same source MAC learned alternately on multiple ports suggests a loop or unstable topology. But this does not address the case requirement to identify MSTP topology instability.
D:Absent learned MAC destinations cause frames to be flooded over eligible VLAN ports. But this does not address the case requirement to identify MSTP topology instability.
HPE Network Switching Professional (HPE7-A08) Practice Tests