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Question 240
Two redundant core fibers share a duct vulnerable to one excavation. What design improvement reduces risk?
- Cabling path diversity
- Wavelength and transceiver reach
- Approved optic part and form factor
- Link aggregation member consistency
Explanation
Correct Answer
A:Physical path diversity avoids one cut taking both links down. Redundant links should avoid a shared failure point where feasible.
Incorrect Answers
B:Two ends must agree on optical standard and rated distance. But this does not address the case requirement to make uplink failure domains independent.
C:Switch and cable ports need supported module form factors and compatible software. But this does not address the case requirement to make uplink failure domains independent.
D:LAG members must agree on speed and Layer 2 parameters to participate correctly. But this does not address the case requirement to make uplink failure domains independent.
Question 241
A fiber span is 10km but the deployed optics are rated only for short reach. What design check was missed?
- Approved optic part and form factor
- Breakout interface compatibility
- Optical receive-power diagnostics
- Wavelength and transceiver reach
Explanation
Correct Answer
D:Link distance must remain within transceiver specifications. Two ends must agree on optical standard and rated distance.
Incorrect Answers
A:Switch and cable ports need supported module form factors and compatible software. But this does not address the case requirement to select optics for installed fiber length.
B:High-speed port breakout requires supported hardware, firmware and cable type. But this does not address the case requirement to select optics for installed fiber length.
C:Low receive power or errors indicate the need for physical loss assessment. But this does not address the case requirement to select optics for installed fiber length.
Question 242
Four transceivers are cabled to a single breakout port that lacks the needed mode. What preflight is needed?
- Approved optic part and form factor
- Wavelength and transceiver reach
- Breakout interface compatibility
- Cabling path diversity
Explanation
Correct Answer
C:Breakout must be explicitly supported on the exact hardware. High-speed port breakout requires supported hardware, firmware and cable type.
Incorrect Answers
A:Switch and cable ports need supported module form factors and compatible software. But this does not address the case requirement to avoid unsupported port splitting.
B:Two ends must agree on optical standard and rated distance. But this does not address the case requirement to avoid unsupported port splitting.
D:Redundant links should avoid a shared failure point where feasible. But this does not address the case requirement to avoid unsupported port splitting.
Question 243
A repaired fiber runs with high CRC despite matching VLANs. Which evidence should be checked first?
- Breakout interface compatibility
- Wavelength and transceiver reach
- Link aggregation member consistency
- Optical receive-power diagnostics
Explanation
Correct Answer
D:Physical optical signal quality is a foundational dependency. Low receive power or errors indicate the need for physical loss assessment.
Incorrect Answers
A:High-speed port breakout requires supported hardware, firmware and cable type. But this does not address the case requirement to measure receive power and fiber errors.
B:Two ends must agree on optical standard and rated distance. But this does not address the case requirement to measure receive power and fiber errors.
C:LAG members must agree on speed and Layer 2 parameters to participate correctly. But this does not address the case requirement to measure receive power and fiber errors.
Question 244
A badge reader sends untagged Ethernet frames and should belong to VLAN 120. Which port setting is appropriate?
- Native or untagged VLAN alignment
- Allowed VLAN list on trunk
- MAC table learning verification
- Access VLAN assignment
Explanation
Correct Answer
D:Assign its access VLAN to the expected broadcast segment. An untagged endpoint access port normally places traffic into its configured VLAN.
Incorrect Answers
A:Mismatched untagged settings can send frames to an unexpected VLAN. But this does not address the case requirement to place untagged edge traffic into the correct VLAN.
B:A trunk transports only intended tagged VLANs permitted on that link. But this does not address the case requirement to place untagged edge traffic into the correct VLAN.
C:Learned MAC entries reveal which VLAN and interface the switch associates with endpoints. But this does not address the case requirement to place untagged edge traffic into the correct VLAN.
Question 245
VLAN 31 works locally but frames are dropped at a trunk configured to allow only VLANs 10 and 20. What needs changing?
- Allowed VLAN list on trunk
- VLAN existence across transit
- Inter-VLAN routing SVI
- Native or untagged VLAN alignment
Explanation
Correct Answer
A:Trunk VLAN membership must include the intended service. A trunk transports only intended tagged VLANs permitted on that link.
Incorrect Answers
B:The VLAN must exist and be active wherever it is required along the Layer 2 path. But this does not address the case requirement to transport VLAN 31 between switches.
C:An SVI/gateway provides Layer 3 forwarding between correctly segmented VLAN subnets. But this does not address the case requirement to transport VLAN 31 between switches.
D:Mismatched untagged settings can send frames to an unexpected VLAN. But this does not address the case requirement to transport VLAN 31 between switches.
Question 246
An untagged packet enters a link where each peer uses a different native VLAN. What configuration must be reconciled?
- Inter-VLAN routing SVI
- Access VLAN assignment
- Native or untagged VLAN alignment
- VLAN existence across transit
Explanation
Correct Answer
C:Untagged VLAN interpretation must match on peers. Mismatched untagged settings can send frames to an unexpected VLAN.
Incorrect Answers
A:An SVI/gateway provides Layer 3 forwarding between correctly segmented VLAN subnets. But this does not address the case requirement to avoid unintended untagged VLAN mapping.
B:An untagged endpoint access port normally places traffic into its configured VLAN. But this does not address the case requirement to avoid unintended untagged VLAN mapping.
D:The VLAN must exist and be active wherever it is required along the Layer 2 path. But this does not address the case requirement to avoid unintended untagged VLAN mapping.
Question 247
Users in VLAN 20 cannot reach VLAN 30 even though both broadcast domains work locally. What routing function is needed?
- Allowed VLAN list on trunk
- Inter-VLAN routing SVI
- MAC table learning verification
- VLAN existence across transit
Explanation
Correct Answer
B:A routed SVI and authorized path connect IP subnets. An SVI/gateway provides Layer 3 forwarding between correctly segmented VLAN subnets.
Incorrect Answers
A:A trunk transports only intended tagged VLANs permitted on that link. But this does not address the case requirement to forward permitted traffic between VLAN networks.
C:Learned MAC entries reveal which VLAN and interface the switch associates with endpoints. But this does not address the case requirement to forward permitted traffic between VLAN networks.
D:The VLAN must exist and be active wherever it is required along the Layer 2 path. But this does not address the case requirement to forward permitted traffic between VLAN networks.
Question 248
A trunk allows VLAN 45 but the receiving switch has no active VLAN 45. What should be verified?
- VLAN existence across transit
- MAC table learning verification
- Native or untagged VLAN alignment
- Inter-VLAN routing SVI
Explanation
Correct Answer
A:VLAN presence and state matter at all required nodes. The VLAN must exist and be active wherever it is required along the Layer 2 path.
Incorrect Answers
B:Learned MAC entries reveal which VLAN and interface the switch associates with endpoints. But this does not address the case requirement to carry a VLAN on every hop.
C:Mismatched untagged settings can send frames to an unexpected VLAN. But this does not address the case requirement to carry a VLAN on every hop.
D:An SVI/gateway provides Layer 3 forwarding between correctly segmented VLAN subnets. But this does not address the case requirement to carry a VLAN on every hop.
Question 249
An operator suspects a host is learned on the wrong port of VLAN 16. What state table helps?
- MAC table learning verification
- Inter-VLAN routing SVI
- Access VLAN assignment
- Allowed VLAN list on trunk
Explanation
Correct Answer
A:MAC learning reveals VLAN and attachment interface. Learned MAC entries reveal which VLAN and interface the switch associates with endpoints.
Incorrect Answers
B:An SVI/gateway provides Layer 3 forwarding between correctly segmented VLAN subnets. But this does not address the case requirement to verify Layer 2 forwarding information.
C:An untagged endpoint access port normally places traffic into its configured VLAN. But this does not address the case requirement to verify Layer 2 forwarding information.
D:A trunk transports only intended tagged VLANs permitted on that link. But this does not address the case requirement to verify Layer 2 forwarding information.
Question 250
A new voice VLAN is absent from the distribution trunk despite correct edge tagging. What configuration should be checked?
- Native or untagged VLAN alignment
- Allowed VLAN list on trunk
- Inter-VLAN routing SVI
- VLAN existence across transit
Explanation
Correct Answer
B:Allowed VLAN lists determine transit reachability. A trunk transports only intended tagged VLANs permitted on that link.
Incorrect Answers
A:Mismatched untagged settings can send frames to an unexpected VLAN. But this does not address the case requirement to permit the intended tagged VLAN along the path.
C:An SVI/gateway provides Layer 3 forwarding between correctly segmented VLAN subnets. But this does not address the case requirement to permit the intended tagged VLAN along the path.
D:The VLAN must exist and be active wherever it is required along the Layer 2 path. But this does not address the case requirement to permit the intended tagged VLAN along the path.
HPE Network Switching Professional (HPE7-A08) Practice Tests