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HP HPE7-A08 Practice Test 47

Question 460

A CX fiber port remains down after VLAN changes; one end uses an SR multi-mode module and the other a long-reach single-mode optic. What is the likely failure?

  1. Intermittent physical link flap
  2. Copper pair or distance defect
  3. Unsupported transceiver or fiber standard
  4. Speed or autonegotiation incompatibility

Explanation

Correct Answer

C:

The physical optical standards are incompatible. An optic/fiber speed or media mismatch prevents a valid physical link even with correct Layer 2 configuration.

Incorrect Answers

A:

A bad cable, module or hardware problem can cause recurring link-up/link-down events. But this does not address the case requirement to find the transceiver or fiber mismatch.

B:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to find the transceiver or fiber mismatch.

D:

Two endpoints with incompatible port speeds or negotiation behavior may fail to establish stable Ethernet. But this does not address the case requirement to find the transceiver or fiber mismatch.

Question 461

A distribution uplink shows -19 dBm receive power below the receiver minimum, with packet errors. Which cause best fits?

  1. Speed or autonegotiation incompatibility
  2. Copper pair or distance defect
  3. Optical receive power below threshold
  4. Unsupported transceiver or fiber standard

Explanation

Correct Answer

C:

Attenuation or a damaged optical plant explains low receive signal. Excess attenuation or damaged cabling can yield weak light and errors on an optical interface.

Incorrect Answers

A:

Two endpoints with incompatible port speeds or negotiation behavior may fail to establish stable Ethernet. But this does not address the case requirement to identify inadequate optical signal level.

B:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to identify inadequate optical signal level.

D:

An optic/fiber speed or media mismatch prevents a valid physical link even with correct Layer 2 configuration. But this does not address the case requirement to identify inadequate optical signal level.

Question 462

A copper link runs through an old 170m cable segment and repeatedly drops to 100M with CRC errors. What root cause should be evaluated?

  1. Speed or autonegotiation incompatibility
  2. Administratively disabled interface
  3. Intermittent physical link flap
  4. Copper pair or distance defect

Explanation

Correct Answer

D:

An out-of-spec copper channel can corrupt signaling. Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors.

Incorrect Answers

A:

Two endpoints with incompatible port speeds or negotiation behavior may fail to establish stable Ethernet. But this does not address the case requirement to find a defective or overlength twisted-pair link.

B:

A shutdown interface stays disabled regardless of healthy peer optics and VLAN configuration. But this does not address the case requirement to find a defective or overlength twisted-pair link.

C:

A bad cable, module or hardware problem can cause recurring link-up/link-down events. But this does not address the case requirement to find a defective or overlength twisted-pair link.

Question 463

Interface 1/1/28 shows administratively down while the transceiver inventory is healthy. What most directly explains no carrier?

  1. Intermittent physical link flap
  2. Administratively disabled interface
  3. Optical receive power below threshold
  4. Copper pair or distance defect

Explanation

Correct Answer

B:

The switch has explicitly disabled the port. A shutdown interface stays disabled regardless of healthy peer optics and VLAN configuration.

Incorrect Answers

A:

A bad cable, module or hardware problem can cause recurring link-up/link-down events. But this does not address the case requirement to identify an administratively shut interface.

C:

Excess attenuation or damaged cabling can yield weak light and errors on an optical interface. But this does not address the case requirement to identify an administratively shut interface.

D:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to identify an administratively shut interface.

Question 464

A core side supports 25G and a remote port supports only 10G with no compatible operating mode. What prevents link-up?

  1. Speed or autonegotiation incompatibility
  2. Administratively disabled interface
  3. Copper pair or distance defect
  4. Optical receive power below threshold

Explanation

Correct Answer

A:

The PHYs cannot negotiate a common supported speed. Two endpoints with incompatible port speeds or negotiation behavior may fail to establish stable Ethernet.

Incorrect Answers

B:

A shutdown interface stays disabled regardless of healthy peer optics and VLAN configuration. But this does not address the case requirement to identify link-speed incompatibility.

C:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to identify link-speed incompatibility.

D:

Excess attenuation or damaged cabling can yield weak light and errors on an optical interface. But this does not address the case requirement to identify link-speed incompatibility.

Question 465

A campus fiber pair goes up and down at random intervals after rain, while no routing configuration changed. What problem type is most likely?

  1. Copper pair or distance defect
  2. Intermittent physical link flap
  3. Speed or autonegotiation incompatibility
  4. Administratively disabled interface

Explanation

Correct Answer

B:

Intermittent physical connection or optics can flap links. A bad cable, module or hardware problem can cause recurring link-up/link-down events.

Incorrect Answers

A:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to attribute repeated carrier transitions to physical instability.

C:

Two endpoints with incompatible port speeds or negotiation behavior may fail to establish stable Ethernet. But this does not address the case requirement to attribute repeated carrier transitions to physical instability.

D:

A shutdown interface stays disabled regardless of healthy peer optics and VLAN configuration. But this does not address the case requirement to attribute repeated carrier transitions to physical instability.

Question 466

An interface counters report low Rx optical power and increasing FCS errors, although OSPF is healthy when up. Where is the likely fault?

  1. Optical receive power below threshold
  2. Administratively disabled interface
  3. Unsupported transceiver or fiber standard
  4. Copper pair or distance defect

Explanation

Correct Answer

A:

Low light and errors point to fiber attenuation. Excess attenuation or damaged cabling can yield weak light and errors on an optical interface.

Incorrect Answers

B:

A shutdown interface stays disabled regardless of healthy peer optics and VLAN configuration. But this does not address the case requirement to diagnose optical loss rather than routing policy.

C:

An optic/fiber speed or media mismatch prevents a valid physical link even with correct Layer 2 configuration. But this does not address the case requirement to diagnose optical loss rather than routing policy.

D:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to diagnose optical loss rather than routing policy.

Question 467

After a migration, the interface shows down because shutdown remains in running config. Which failure classification is supported?

  1. Administratively disabled interface
  2. Intermittent physical link flap
  3. Optical receive power below threshold
  4. Copper pair or distance defect

Explanation

Correct Answer

A:

Admin state overrides physical readiness. A shutdown interface stays disabled regardless of healthy peer optics and VLAN configuration.

Incorrect Answers

B:

A bad cable, module or hardware problem can cause recurring link-up/link-down events. But this does not address the case requirement to distinguish intentional shutdown from failed media.

C:

Excess attenuation or damaged cabling can yield weak light and errors on an optical interface. But this does not address the case requirement to distinguish intentional shutdown from failed media.

D:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to distinguish intentional shutdown from failed media.

Question 468

Two fixed-speed interfaces do not share a supported bitrate even after cable replacement. What should be checked?

  1. Copper pair or distance defect
  2. Optical receive power below threshold
  3. Speed or autonegotiation incompatibility
  4. Unsupported transceiver or fiber standard

Explanation

Correct Answer

C:

Compatible link-speed configuration is necessary. Two endpoints with incompatible port speeds or negotiation behavior may fail to establish stable Ethernet.

Incorrect Answers

A:

Damaged twisted pairs or channel-length violations create carrier problems and increasing physical errors. But this does not address the case requirement to negotiate a mutually supported Ethernet speed.

B:

Excess attenuation or damaged cabling can yield weak light and errors on an optical interface. But this does not address the case requirement to negotiate a mutually supported Ethernet speed.

D:

An optic/fiber speed or media mismatch prevents a valid physical link even with correct Layer 2 configuration. But this does not address the case requirement to negotiate a mutually supported Ethernet speed.

Question 469

A camera sends untagged frames on a port assigned to employee VLAN 10 instead of camera VLAN 40. What explains its wrong subnet?

  1. SVI gateway addressing mismatch
  2. Native VLAN mismatch
  3. STP forwarding block on path
  4. Access VLAN assigned incorrectly

Explanation

Correct Answer

D:

The access port assigns untagged traffic to the incorrect VLAN. An endpoint connected to the wrong access VLAN lands in a different broadcast domain.

Incorrect Answers

A:

Clients may have Layer 2 access but cannot route if gateway and subnet addressing disagree. But this does not address the case requirement to identify edge VLAN misassignment.

B:

Untagged frames can enter the wrong VLAN when trunk native assignments differ. But this does not address the case requirement to identify edge VLAN misassignment.

C:

A blocked or alternate spanning-tree port can prevent forwarding on a planned redundant path. But this does not address the case requirement to identify edge VLAN misassignment.

Question 470

VLAN 200 works between two desks but fails beyond a distribution link allowing only 100 and 150. What is missing?

  1. SVI gateway addressing mismatch
  2. Trunk missing required VLAN
  3. Access VLAN assigned incorrectly
  4. Native VLAN mismatch

Explanation

Correct Answer

B:

The trunk does not transport the required VLAN tag. An upstream trunk drops a tagged VLAN omitted from its allowed list.

Incorrect Answers

A:

Clients may have Layer 2 access but cannot route if gateway and subnet addressing disagree. But this does not address the case requirement to locate a disallowed VLAN on a trunk.

C:

An endpoint connected to the wrong access VLAN lands in a different broadcast domain. But this does not address the case requirement to locate a disallowed VLAN on a trunk.

D:

Untagged frames can enter the wrong VLAN when trunk native assignments differ. But this does not address the case requirement to locate a disallowed VLAN on a trunk.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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