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Question 470
VLAN 200 works between two desks but fails beyond a distribution link allowing only 100 and 150. What is missing?
- SVI gateway addressing mismatch
- Trunk missing required VLAN
- Access VLAN assigned incorrectly
- 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.
Question 471
Two trunk peers use different native VLANs; only untagged service traffic reaches the wrong network. What configuration mismatch fits?
- Trunk missing required VLAN
- Native VLAN mismatch
- SVI gateway addressing mismatch
- VLAN absent on intermediate switch
Explanation
Correct Answer
B:Untagged frames are classified inconsistently across peers. Untagged frames can enter the wrong VLAN when trunk native assignments differ.
Incorrect Answers
A:An upstream trunk drops a tagged VLAN omitted from its allowed list. But this does not address the case requirement to identify native-VLAN disagreement.
C: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 native-VLAN disagreement.
D:Even a permitted tag cannot function where VLAN membership is not configured or active. But this does not address the case requirement to identify native-VLAN disagreement.
Question 472
All trunks allow VLAN 60, but a middle switch has no VLAN 60 record. What root cause blocks transit?
- VLAN absent on intermediate switch
- SVI gateway addressing mismatch
- Native VLAN mismatch
- Access VLAN assigned incorrectly
Explanation
Correct Answer
A:The intermediate switch lacks the necessary VLAN definition. Even a permitted tag cannot function where VLAN membership is not configured or active.
Incorrect Answers
B: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 a missing VLAN in the transit chain.
C:Untagged frames can enter the wrong VLAN when trunk native assignments differ. But this does not address the case requirement to identify a missing VLAN in the transit chain.
D:An endpoint connected to the wrong access VLAN lands in a different broadcast domain. But this does not address the case requirement to identify a missing VLAN in the transit chain.
Question 473
Hosts in VLAN 12 can ping each other but default gateway uses a different IP prefix. What mismatch explains L3 failure?
- STP forwarding block on path
- Trunk missing required VLAN
- SVI gateway addressing mismatch
- Native VLAN mismatch
Explanation
Correct Answer
C:The routed SVI address does not match the host subnet plan. Clients may have Layer 2 access but cannot route if gateway and subnet addressing disagree.
Incorrect Answers
A:A blocked or alternate spanning-tree port can prevent forwarding on a planned redundant path. But this does not address the case requirement to diagnose gateway/subnet inconsistency.
B:An upstream trunk drops a tagged VLAN omitted from its allowed list. But this does not address the case requirement to diagnose gateway/subnet inconsistency.
D:Untagged frames can enter the wrong VLAN when trunk native assignments differ. But this does not address the case requirement to diagnose gateway/subnet inconsistency.
Question 474
One redundant port is discarding under MSTP and users assume both paths must forward simultaneously. What mechanism explains the state?
- STP forwarding block on path
- Native VLAN mismatch
- SVI gateway addressing mismatch
- Access VLAN assigned incorrectly
Explanation
Correct Answer
A:STP intentionally blocks redundant bridged paths to prevent loops. A blocked or alternate spanning-tree port can prevent forwarding on a planned redundant path.
Incorrect Answers
B:Untagged frames can enter the wrong VLAN when trunk native assignments differ. But this does not address the case requirement to identify spanning-tree loop-prevention state.
C: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 spanning-tree loop-prevention state.
D:An endpoint connected to the wrong access VLAN lands in a different broadcast domain. But this does not address the case requirement to identify spanning-tree loop-prevention state.
Question 475
Users in VLAN 70 work in one building but not across a core trunk that excludes 70. What should be investigated?
- Native VLAN mismatch
- SVI gateway addressing mismatch
- Trunk missing required VLAN
- Access VLAN assigned incorrectly
Explanation
Correct Answer
C:Tagged membership must be allowed on the interbuilding trunk. An upstream trunk drops a tagged VLAN omitted from its allowed list.
Incorrect Answers
A:Untagged frames can enter the wrong VLAN when trunk native assignments differ. But this does not address the case requirement to find a missing allowed VLAN.
B:Clients may have Layer 2 access but cannot route if gateway and subnet addressing disagree. But this does not address the case requirement to find a missing allowed VLAN.
D:An endpoint connected to the wrong access VLAN lands in a different broadcast domain. But this does not address the case requirement to find a missing allowed VLAN.
Question 476
A workstation has 10.50.8.44/24 but its VLAN SVI is 10.50.9.1/24, causing off-subnet failure. Which type of defect?
- SVI gateway addressing mismatch
- VLAN absent on intermediate switch
- Access VLAN assigned incorrectly
- Trunk missing required VLAN
Explanation
Correct Answer
A:The gateway is not on the user's connected subnet. Clients may have Layer 2 access but cannot route if gateway and subnet addressing disagree.
Incorrect Answers
B:Even a permitted tag cannot function where VLAN membership is not configured or active. But this does not address the case requirement to classify Layer 3 addressing mismatch.
C:An endpoint connected to the wrong access VLAN lands in a different broadcast domain. But this does not address the case requirement to classify Layer 3 addressing mismatch.
D:An upstream trunk drops a tagged VLAN omitted from its allowed list. But this does not address the case requirement to classify Layer 3 addressing mismatch.
Question 477
A new phone gets data VLAN DHCP rather than voice VLAN DHCP after moving ports. Which edge config is likely wrong?
- VLAN absent on intermediate switch
- SVI gateway addressing mismatch
- Access VLAN assigned incorrectly
- Trunk missing required VLAN
Explanation
Correct Answer
C:The phone traffic entered the unintended port VLAN. An endpoint connected to the wrong access VLAN lands in a different broadcast domain.
Incorrect Answers
A:Even a permitted tag cannot function where VLAN membership is not configured or active. But this does not address the case requirement to identify incorrect access or voice VLAN classification.
B: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 incorrect access or voice VLAN classification.
D:An upstream trunk drops a tagged VLAN omitted from its allowed list. But this does not address the case requirement to identify incorrect access or voice VLAN classification.
Question 478
Two CX uplinks show physical carrier but both ends of the configured LACP group are passive. Why is the LAG missing?
- Partner system identity disagreement
- Inconsistent member configuration
- One physical member failure
- LACP passive versus passive
Explanation
Correct Answer
D:Neither peer initiates LACP negotiation. Two passive LACP endpoints do not initiate negotiation and may never create a bundle.
Incorrect Answers
A:Bundling requires compatible LACP system/port partner information and correct cabling. But this does not address the case requirement to diagnose passive/passive negotiation.
B:LAG members with mismatched VLAN, speed, or supported policy settings may be suspended. But this does not address the case requirement to diagnose passive/passive negotiation.
C:A LAG can remain up with reduced capacity when one member's carrier is lost. But this does not address the case requirement to diagnose passive/passive negotiation.
Question 479
One aggregate member has an extra native VLAN and is suspended while other members collect. What explains the exclusion?
- Inconsistent member configuration
- Partner system identity disagreement
- LACP partner not sending PDUs
- Minimum-links threshold not met
Explanation
Correct Answer
A:Member Layer 2 attributes must be consistent within the bundle. LAG members with mismatched VLAN, speed, or supported policy settings may be suspended.
Incorrect Answers
B:Bundling requires compatible LACP system/port partner information and correct cabling. But this does not address the case requirement to identify incompatible LAG member settings.
C:No expected LACP messages can indicate peer configuration or protocol path failure. But this does not address the case requirement to identify incompatible LAG member settings.
D:An aggregate may intentionally stay down if too few links satisfy its minimum. But this does not address the case requirement to identify incompatible LAG member settings.
Question 480
Two cable pairs connect to different remote switches without VSX, but the local LAG expects one partner. What state mismatch explains failure?
- One physical member failure
- Partner system identity disagreement
- Minimum-links threshold not met
- LACP passive versus passive
Explanation
Correct Answer
B:The local ports see inconsistent LACP partner identities. Bundling requires compatible LACP system/port partner information and correct cabling.
Incorrect Answers
A:A LAG can remain up with reduced capacity when one member's carrier is lost. But this does not address the case requirement to detect incorrect cabling or aggregation endpoints.
C:An aggregate may intentionally stay down if too few links satisfy its minimum. But this does not address the case requirement to detect incorrect cabling or aggregation endpoints.
D:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to detect incorrect cabling or aggregation endpoints.
HPE Network Switching Professional (HPE7-A08) Practice Tests