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Question 590
A tenant switch advertises a superior BPDU toward the building root. Which boundary protection is relevant?
- Verify convergence and topology-change counters
- Restore intended STP root priority
- Apply root guard at proper boundary
- Configure edge BPDU protection
Explanation
Correct Answer
C:Root guard defends the chosen STP root across a controlled interface. Protect the intended STP root from unauthorized superior bridge claims.
Incorrect Answers
A:After repair check STP roles, blocked ports, broadcasts and event rates. But this does not address the case requirement to prevent unintended root takeover.
B:An intentional low-priority root at aggregation guides stable redundant path decisions. But this does not address the case requirement to prevent unintended root takeover.
D:Use supported edge safeguards so unexpected switches cannot extend user-facing topology. But this does not address the case requirement to prevent unintended root takeover.
Question 591
After replacing a looped cable the network stabilizes, but topology change counters continue rising. What validation is needed?
- Apply root guard at proper boundary
- Verify convergence and topology-change counters
- Configure edge BPDU protection
- Restore intended STP root priority
Explanation
Correct Answer
B:Check STP roles and change-event rate after remediation. After repair check STP roles, blocked ports, broadcasts and event rates.
Incorrect Answers
A:Protect the intended STP root from unauthorized superior bridge claims. But this does not address the case requirement to prove stable spanning-tree convergence.
C:Use supported edge safeguards so unexpected switches cannot extend user-facing topology. But this does not address the case requirement to prove stable spanning-tree convergence.
D:An intentional low-priority root at aggregation guides stable redundant path decisions. But this does not address the case requirement to prove stable spanning-tree convergence.
Question 592
A classroom bridge patch causes a campus broadcast storm. What safe first isolation action fits?
- Verify convergence and topology-change counters
- Apply root guard at proper boundary
- Align MSTP region mapping
- Investigate and isolate accidental L2 loop
Explanation
Correct Answer
D:Disconnect the unintended Layer 2 path. Disconnect or shut the unintended bridging connection and restore a loop-free physical topology.
Incorrect Answers
A:After repair check STP roles, blocked ports, broadcasts and event rates. But this does not address the case requirement to remove a source of self-replicating frames.
B:Protect the intended STP root from unauthorized superior bridge claims. But this does not address the case requirement to remove a source of self-replicating frames.
C:Matching name, revision and VLAN-instance mappings establish desired region relationships. But this does not address the case requirement to remove a source of self-replicating frames.
Question 593
Two distribution switches share region name but different instance revisions. What should be reconciled?
- Align MSTP region mapping
- Verify convergence and topology-change counters
- Restore intended STP root priority
- Configure edge BPDU protection
Explanation
Correct Answer
A:MSTP region revision and mapping must match. Matching name, revision and VLAN-instance mappings establish desired region relationships.
Incorrect Answers
B:After repair check STP roles, blocked ports, broadcasts and event rates. But this does not address the case requirement to fix the region digest inconsistency.
C:An intentional low-priority root at aggregation guides stable redundant path decisions. But this does not address the case requirement to fix the region digest inconsistency.
D:Use supported edge safeguards so unexpected switches cannot extend user-facing topology. But this does not address the case requirement to fix the region digest inconsistency.
Question 594
An access-port loop was removed, yet the NOC still sees thousands of topology changes per minute. What follow-up is needed?
- Apply root guard at proper boundary
- Restore intended STP root priority
- Verify convergence and topology-change counters
- Configure edge BPDU protection
Explanation
Correct Answer
C:Operational counters should return to expected low levels. After repair check STP roles, blocked ports, broadcasts and event rates.
Incorrect Answers
A:Protect the intended STP root from unauthorized superior bridge claims. But this does not address the case requirement to confirm no remaining unstable bridge path.
B:An intentional low-priority root at aggregation guides stable redundant path decisions. But this does not address the case requirement to confirm no remaining unstable bridge path.
D:Use supported edge safeguards so unexpected switches cannot extend user-facing topology. But this does not address the case requirement to confirm no remaining unstable bridge path.
Question 595
A nurse's 802.1X login succeeds but receives the guest policy. What targeted change should be made?
- Correct identity-to-role mapping
- Verify access with allowed and denied test clients
- Repair DHCP snooping trusted server path
- Align ACL rule scope and ordering
Explanation
Correct Answer
A:Fix the RADIUS role mapping for the authenticated identity. Fix backend RADIUS policy or role attributes while preserving intended least privilege.
Incorrect Answers
B:Controlled policy tests prove restoration without opening protected resources. But this does not address the case requirement to return the intended clinical access profile.
C:Mark the legitimate server-facing interface trusted while retaining untrusted endpoint protection. But this does not address the case requirement to return the intended clinical access profile.
D:Place precise allow and deny entries according to the effective policy evaluation behavior. But this does not address the case requirement to return the intended clinical access profile.
Question 596
New clients cannot authenticate because the switch management VRF lost routes to RADIUS. Which prerequisite should be restored?
- Repair DHCP snooping trusted server path
- Restore RADIUS server reachability
- Bind ACL in correct direction and interface
- Align ACL rule scope and ordering
Explanation
Correct Answer
B:Repair backend network reachability. Repair transport, VRF route or backend availability before disabling endpoint authentication.
Incorrect Answers
A:Mark the legitimate server-facing interface trusted while retaining untrusted endpoint protection. But this does not address the case requirement to reestablish the authentication service path.
C:A valid filter should attach to the actual ingress or egress traffic path. But this does not address the case requirement to reestablish the authentication service path.
D:Place precise allow and deny entries according to the effective policy evaluation behavior. But this does not address the case requirement to reestablish the authentication service path.
Question 597
An overly broad deny ACE shadows the next rule that permits one approved HTTPS server. What correction fits?
- Restore RADIUS server reachability
- Verify access with allowed and denied test clients
- Correct identity-to-role mapping
- Align ACL rule scope and ordering
Explanation
Correct Answer
D:Reorder or narrow the ACL to the intended specific traffic. Place precise allow and deny entries according to the effective policy evaluation behavior.
Incorrect Answers
A:Repair transport, VRF route or backend availability before disabling endpoint authentication. But this does not address the case requirement to allow authorized HTTPS without opening all services.
B:Controlled policy tests prove restoration without opening protected resources. But this does not address the case requirement to allow authorized HTTPS without opening all services.
C:Fix backend RADIUS policy or role attributes while preserving intended least privilege. But this does not address the case requirement to allow authorized HTTPS without opening all services.
Question 598
The correct guest ACL exists but is bound to a VLAN never crossed by guest traffic. What should be changed?
- Repair DHCP snooping trusted server path
- Restore RADIUS server reachability
- Align ACL rule scope and ordering
- Bind ACL in correct direction and interface
Explanation
Correct Answer
D:Apply the ACL at the actual appropriate direction and interface. A valid filter should attach to the actual ingress or egress traffic path.
Incorrect Answers
A:Mark the legitimate server-facing interface trusted while retaining untrusted endpoint protection. But this does not address the case requirement to enforce policy on the real packet path.
B:Repair transport, VRF route or backend availability before disabling endpoint authentication. But this does not address the case requirement to enforce policy on the real packet path.
C:Place precise allow and deny entries according to the effective policy evaluation behavior. But this does not address the case requirement to enforce policy on the real packet path.
Question 599
DHCP clients stop receiving offers after snooping activation because the core server-facing link is untrusted. What should be fixed?
- Align ACL rule scope and ordering
- Repair DHCP snooping trusted server path
- Restore RADIUS server reachability
- Verify access with allowed and denied test clients
Explanation
Correct Answer
B:Trust the legitimate DHCP server port, not all user ports. Mark the legitimate server-facing interface trusted while retaining untrusted endpoint protection.
Incorrect Answers
A:Place precise allow and deny entries according to the effective policy evaluation behavior. But this does not address the case requirement to permit genuine server replies while blocking rogue sources.
C:Repair transport, VRF route or backend availability before disabling endpoint authentication. But this does not address the case requirement to permit genuine server replies while blocking rogue sources.
D:Controlled policy tests prove restoration without opening protected resources. But this does not address the case requirement to permit genuine server replies while blocking rogue sources.
Question 600
The network works for administrators after a role change; guests still can reach finance. What test remains mandatory?
- Correct identity-to-role mapping
- Verify access with allowed and denied test clients
- Restore RADIUS server reachability
- Bind ACL in correct direction and interface
Explanation
Correct Answer
B:Test representative permitted and denied identities. Controlled policy tests prove restoration without opening protected resources.
Incorrect Answers
A:Fix backend RADIUS policy or role attributes while preserving intended least privilege. But this does not address the case requirement to prove least-privilege enforcement after correction.
C:Repair transport, VRF route or backend availability before disabling endpoint authentication. But this does not address the case requirement to prove least-privilege enforcement after correction.
D:A valid filter should attach to the actual ingress or egress traffic path. But this does not address the case requirement to prove least-privilege enforcement after correction.
HPE Network Switching Professional (HPE7-A08) Practice Tests