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Question 310
An area border router sends dozens of consecutive /24 routes to its upstream peer. Which route-design function can reduce scale?
- Adjacency health and reachability
- OSPF passive interface planning
- Route summarization at correct boundary
- OSPF lowest-cost path selection
Explanation
Correct Answer
C:Supported route aggregation reduces exposed prefix count. Supported summaries reduce unnecessary routes without hiding required distinct prefixes.
Incorrect Answers
A:A lost adjacency removes learned routes until alternate topology converges. But this does not address the case requirement to summarize contiguous routing information.
B:Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to summarize contiguous routing information.
D:OSPF prefers eligible paths with the lowest calculated total cost to a destination. But this does not address the case requirement to summarize contiguous routing information.
Question 311
An expected route is absent although the physical uplink is up. Which pair of operational data helps localize the fault?
- ECMP for equal total costs
- Adjacency health and reachability
- OSPF passive interface planning
- LSDB and route comparison
Explanation
Correct Answer
D:Compare advertised OSPF LSAs with the forwarding route table. OSPF link-state database and installed route state should be compared to troubleshoot missing prefixes.
Incorrect Answers
A:Multiple equal-cost paths can be installed if supported and enabled. But this does not address the case requirement to verify control-plane learning and installed routes.
B:A lost adjacency removes learned routes until alternate topology converges. But this does not address the case requirement to verify control-plane learning and installed routes.
C:Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to verify control-plane learning and installed routes.
Question 312
A campus loses one OSPF neighbor and traffic switches to a secondary route after convergence. Which dependency caused the change?
- ECMP for equal total costs
- Adjacency health and reachability
- OSPF passive interface planning
- LSDB and route comparison
Explanation
Correct Answer
B:Neighbor state determines which learned routes remain reachable. A lost adjacency removes learned routes until alternate topology converges.
Incorrect Answers
A:Multiple equal-cost paths can be installed if supported and enabled. But this does not address the case requirement to reconverge after an adjacency failure.
C:Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to reconverge after an adjacency failure.
D:OSPF link-state database and installed route state should be compared to troubleshoot missing prefixes. But this does not address the case requirement to reconverge after an adjacency failure.
Question 313
A path with cost 80 is chosen instead of a path with cost 10, despite both being allowed and up. What metric should be investigated?
- OSPF passive interface planning
- ECMP for equal total costs
- LSDB and route comparison
- OSPF lowest-cost path selection
Explanation
Correct Answer
D:OSPF normally selects the lower total path cost. OSPF prefers eligible paths with the lowest calculated total cost to a destination.
Incorrect Answers
A:Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to validate configured interface costs.
B:Multiple equal-cost paths can be installed if supported and enabled. But this does not address the case requirement to validate configured interface costs.
C:OSPF link-state database and installed route state should be compared to troubleshoot missing prefixes. But this does not address the case requirement to validate configured interface costs.
Question 314
Two OSPF paths of cost 30 each both appear in forwarding. What routing capability explains this?
- ECMP for equal total costs
- OSPF passive interface planning
- LSDB and route comparison
- Route summarization at correct boundary
Explanation
Correct Answer
A:ECMP can install matching-cost eligible alternatives. Multiple equal-cost paths can be installed if supported and enabled.
Incorrect Answers
B:Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to interpret parallel OSPF next hops.
C:OSPF link-state database and installed route state should be compared to troubleshoot missing prefixes. But this does not address the case requirement to interpret parallel OSPF next hops.
D:Supported summaries reduce unnecessary routes without hiding required distinct prefixes. But this does not address the case requirement to interpret parallel OSPF next hops.
Question 315
The LSDB contains a prefix, but it is missing from the routing table. What check is useful?
- Adjacency health and reachability
- Route summarization at correct boundary
- ECMP for equal total costs
- LSDB and route comparison
Explanation
Correct Answer
D:Routing installation policy and preferences may differ from learned LSAs. OSPF link-state database and installed route state should be compared to troubleshoot missing prefixes.
Incorrect Answers
A:A lost adjacency removes learned routes until alternate topology converges. But this does not address the case requirement to compare OSPF control and forwarding decisions.
B:Supported summaries reduce unnecessary routes without hiding required distinct prefixes. But this does not address the case requirement to compare OSPF control and forwarding decisions.
C:Multiple equal-cost paths can be installed if supported and enabled. But this does not address the case requirement to compare OSPF control and forwarding decisions.
Question 316
Two distribution switches must present one default gateway IP to clients as either device fails. What first-hop service fits?
- VRRP role and advertisement verification
- Redundant physical access uplinks
- Tracking of uplink reachability
- Virtual IP gateway for clients
Explanation
Correct Answer
D:VRRP maintains a shared virtual address for the gateway. VRRP peers offer a common virtual gateway address that endpoints can keep across supported failovers.
Incorrect Answers
A:Operational output reveals master/backup state and advertisement health. But this does not address the case requirement to provide a stable client default gateway after failover.
B:Gateway redundancy is not useful if access switches lack a path to the surviving peer. But this does not address the case requirement to provide a stable client default gateway after failover.
C:Tracking upstream failure helps avoid retaining an active gateway with no usable exit. But this does not address the case requirement to provide a stable client default gateway after failover.
Question 317
An engineer wants switch A preferred while healthy and switch B standby. What attribute governs election?
- Priority and active-router election
- Redundant physical access uplinks
- Consistent virtual router ID
- Virtual IP gateway for clients
Explanation
Correct Answer
A:VRRP priority affects master selection. VRRP priority and tracking influence which eligible peer becomes primary.
Incorrect Answers
B:Gateway redundancy is not useful if access switches lack a path to the surviving peer. But this does not address the case requirement to choose which peer normally forwards as gateway.
C:Peers serving one virtual gateway must use compatible VRID and subnet settings. But this does not address the case requirement to choose which peer normally forwards as gateway.
D:VRRP peers offer a common virtual gateway address that endpoints can keep across supported failovers. But this does not address the case requirement to choose which peer normally forwards as gateway.
Question 318
Primary core's uplink fails while its local SVI remains up; clients should fail over. What feature should be planned?
- Consistent virtual router ID
- Redundant physical access uplinks
- Virtual IP gateway for clients
- Tracking of uplink reachability
Explanation
Correct Answer
D:Uplink tracking can influence gateway election. Tracking upstream failure helps avoid retaining an active gateway with no usable exit.
Incorrect Answers
A:Peers serving one virtual gateway must use compatible VRID and subnet settings. But this does not address the case requirement to avoid a master with no upstream path.
B:Gateway redundancy is not useful if access switches lack a path to the surviving peer. But this does not address the case requirement to avoid a master with no upstream path.
C:VRRP peers offer a common virtual gateway address that endpoints can keep across supported failovers. But this does not address the case requirement to avoid a master with no upstream path.
Question 319
Two switches use the same virtual IP but different virtual router identifiers. Which consistency parameter is wrong?
- Tracking of uplink reachability
- Consistent virtual router ID
- Priority and active-router election
- VRRP role and advertisement verification
Explanation
Correct Answer
B:VRRP peers serving one group need matching identification. Peers serving one virtual gateway must use compatible VRID and subnet settings.
Incorrect Answers
A:Tracking upstream failure helps avoid retaining an active gateway with no usable exit. But this does not address the case requirement to join the correct virtual gateway group.
C:VRRP priority and tracking influence which eligible peer becomes primary. But this does not address the case requirement to join the correct virtual gateway group.
D:Operational output reveals master/backup state and advertisement health. But this does not address the case requirement to join the correct virtual gateway group.
Question 320
Both peers unexpectedly report master for one VLAN. What should be examined?
- Consistent virtual router ID
- Redundant physical access uplinks
- VRRP role and advertisement verification
- Priority and active-router election
Explanation
Correct Answer
C:VRRP advertisements and interface state explain dual-master conditions. Operational output reveals master/backup state and advertisement health.
Incorrect Answers
A:Peers serving one virtual gateway must use compatible VRID and subnet settings. But this does not address the case requirement to validate active and standby gateway status.
B:Gateway redundancy is not useful if access switches lack a path to the surviving peer. But this does not address the case requirement to validate active and standby gateway status.
D:VRRP priority and tracking influence which eligible peer becomes primary. But this does not address the case requirement to validate active and standby gateway status.
HPE Network Switching Professional (HPE7-A08) Practice Tests