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Question 540
A privileged engineer is placed in an onboarding role after a ClearPass policy change. Which decision should be traced?
- Missing DHCP snooping binding
- Expired or rejected 802.1X credentials
- Incorrect downloadable user role
- Unreachable RADIUS authentication service
Explanation
Correct Answer
C:Role mapping controls client access after successful authentication. An authenticated client may receive a role with the wrong enforcement permissions.
Incorrect Answers
A:First-hop protections can drop legitimate IP or ARP packets when binding state is absent or stale. But this does not address the case requirement to verify RADIUS enforcement result.
B:Identity failure prevents the port from entering the authorized access state. But this does not address the case requirement to verify RADIUS enforcement result.
D:New admission requests cannot complete if the backend is inaccessible without appropriate fallback. But this does not address the case requirement to verify RADIUS enforcement result.
Question 541
A 100G uplink reports low receiver power and many FCS errors after a fiber splice. What is the safest initial remediation?
- Reconcile supported link speed
- Retest link counters after correction
- Repair fiber patch and polarity
- Check physical signal and replace faulty medium
Explanation
Correct Answer
D:Measure and repair the optical path instead of editing VLANs. Inspect carrier, optic receive power and counters before replacing a damaged cable or transceiver.
Incorrect Answers
A:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to restore clean physical signaling.
B:Confirm stable carrier and no new CRC, FCS or optical errors after work. But this does not address the case requirement to restore clean physical signaling.
C:Correct mismatched Tx/Rx or mispatch at the optical distribution frame. But this does not address the case requirement to restore clean physical signaling.
Question 542
The intended aggregation port is configured shutdown following a maintenance task, although optics are healthy. What should the authorized operator do?
- Validate transceiver and platform matrix
- Reconcile supported link speed
- Repair fiber patch and polarity
- Correct disabled interface state
Explanation
Correct Answer
D:Validate intent and reenable the administratively disabled interface. Remove an unintended administrative shutdown only after verifying the approved port purpose.
Incorrect Answers
A:Use optics supported by the exact switch family, firmware, speed and fiber type. But this does not address the case requirement to restore a deliberately shut port when appropriate.
B:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to restore a deliberately shut port when appropriate.
C:Correct mismatched Tx/Rx or mispatch at the optical distribution frame. But this does not address the case requirement to restore a deliberately shut port when appropriate.
Question 543
One side of a link is fixed at 25G and the peer supports only 10G; no common mode exists. Which remediation fits?
- Reconcile supported link speed
- Check physical signal and replace faulty medium
- Correct disabled interface state
- Validate transceiver and platform matrix
Explanation
Correct Answer
A:Select compatible operating speeds and modules. Match both endpoints' capabilities and intended negotiated speed before upper-layer changes.
Incorrect Answers
B:Inspect carrier, optic receive power and counters before replacing a damaged cable or transceiver. But this does not address the case requirement to establish a mutually supported physical link.
C:Remove an unintended administrative shutdown only after verifying the approved port purpose. But this does not address the case requirement to establish a mutually supported physical link.
D:Use optics supported by the exact switch family, firmware, speed and fiber type. But this does not address the case requirement to establish a mutually supported physical link.
Question 544
Two fiber ends both report no receive light after patch-panel work, and TX fibers cross incorrectly. What corrective work is needed?
- Validate transceiver and platform matrix
- Retest link counters after correction
- Repair fiber patch and polarity
- Check physical signal and replace faulty medium
Explanation
Correct Answer
C:Fix polarity and patch alignment end to end. Correct mismatched Tx/Rx or mispatch at the optical distribution frame.
Incorrect Answers
A:Use optics supported by the exact switch family, firmware, speed and fiber type. But this does not address the case requirement to connect the intended fiber transmit and receive paths.
B:Confirm stable carrier and no new CRC, FCS or optical errors after work. But this does not address the case requirement to connect the intended fiber transmit and receive paths.
D:Inspect carrier, optic receive power and counters before replacing a damaged cable or transceiver. But this does not address the case requirement to connect the intended fiber transmit and receive paths.
Question 545
A third-party optic is rejected after firmware upgrade despite matching fiber wavelength. What compatibility check must be done?
- Reconcile supported link speed
- Validate transceiver and platform matrix
- Retest link counters after correction
- Repair fiber patch and polarity
Explanation
Correct Answer
B:Use the official supported optic matrix for the installed release. Use optics supported by the exact switch family, firmware, speed and fiber type.
Incorrect Answers
A:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to select a supported transceiver.
C:Confirm stable carrier and no new CRC, FCS or optical errors after work. But this does not address the case requirement to select a supported transceiver.
D:Correct mismatched Tx/Rx or mispatch at the optical distribution frame. But this does not address the case requirement to select a supported transceiver.
Question 546
A fiber replacement brings link carrier back but errors continue to increase. What validation must follow?
- Repair fiber patch and polarity
- Correct disabled interface state
- Reconcile supported link speed
- Retest link counters after correction
Explanation
Correct Answer
D:Monitor physical counters under load after repair. Confirm stable carrier and no new CRC, FCS or optical errors after work.
Incorrect Answers
A:Correct mismatched Tx/Rx or mispatch at the optical distribution frame. But this does not address the case requirement to prove the link is truly healthy.
B:Remove an unintended administrative shutdown only after verifying the approved port purpose. But this does not address the case requirement to prove the link is truly healthy.
C:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to prove the link is truly healthy.
Question 547
A core uplink fails with loss-of-signal alarms but route entries are unchanged. What should be repaired before touching routing?
- Check physical signal and replace faulty medium
- Retest link counters after correction
- Reconcile supported link speed
- Validate transceiver and platform matrix
Explanation
Correct Answer
A:Fix physical light level and cable path. Inspect carrier, optic receive power and counters before replacing a damaged cable or transceiver.
Incorrect Answers
B:Confirm stable carrier and no new CRC, FCS or optical errors after work. But this does not address the case requirement to restore physical link signal.
C:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to restore physical link signal.
D:Use optics supported by the exact switch family, firmware, speed and fiber type. But this does not address the case requirement to restore physical link signal.
Question 548
An engineer discovers transmit and receive strands landed on the same connector side. What should be corrected?
- Validate transceiver and platform matrix
- Check physical signal and replace faulty medium
- Reconcile supported link speed
- Repair fiber patch and polarity
Explanation
Correct Answer
D:Repair the patch cord polarity. Correct mismatched Tx/Rx or mispatch at the optical distribution frame.
Incorrect Answers
A:Use optics supported by the exact switch family, firmware, speed and fiber type. But this does not address the case requirement to connect Tx on one side to Rx on the other.
B:Inspect carrier, optic receive power and counters before replacing a damaged cable or transceiver. But this does not address the case requirement to connect Tx on one side to Rx on the other.
C:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to connect Tx on one side to Rx on the other.
Question 549
After an optic swap the link remains up but produces thousands of CRC per minute. What should the engineer do before closing?
- Correct disabled interface state
- Retest link counters after correction
- Validate transceiver and platform matrix
- Reconcile supported link speed
Explanation
Correct Answer
B:Validate ongoing error counters rather than trusting link-up alone. Confirm stable carrier and no new CRC, FCS or optical errors after work.
Incorrect Answers
A:Remove an unintended administrative shutdown only after verifying the approved port purpose. But this does not address the case requirement to verify stable error-free transmission.
C:Use optics supported by the exact switch family, firmware, speed and fiber type. But this does not address the case requirement to verify stable error-free transmission.
D:Match both endpoints' capabilities and intended negotiated speed before upper-layer changes. But this does not address the case requirement to verify stable error-free transmission.
Question 550
A door controller on port 1/1/3 receives staff VLAN DHCP rather than the required IoT network. What should be changed?
- Align native or untagged VLAN on peers
- Correct access VLAN on intended edge port
- Add missing allowed VLAN to transit trunk
- Verify postchange MAC and connectivity
Explanation
Correct Answer
B:Correct the assigned access VLAN while retaining access control. Move the endpoint into its approved VLAN while preserving other port security settings.
Incorrect Answers
A:Consistent untagged handling prevents traffic from entering the wrong broadcast domain. But this does not address the case requirement to restore proper endpoint VLAN membership.
C:Permit only the intended VLAN tag across required interswitch links. But this does not address the case requirement to restore proper endpoint VLAN membership.
D:Test intended VLAN paths and deny unwanted cross-segment access after correction. But this does not address the case requirement to restore proper endpoint VLAN membership.
HPE Network Switching Professional (HPE7-A08) Practice Tests