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Exam Code: JN0-452

Exam Name: Mist AI Wireless, Specialist (JNCIS-MistAI-Wireless)

Certification Provider: Juniper

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Juniper JN0-452 Practice Test 77

Question 760

At a metropolitan office, an issue has been corrected: The WLAN administrator assumes every 802.11v transition suggestion automatically disassociates a reluctant client. Which repeatable control should the team add to prevent it from returning?

  1. Baseline low-rate client dependencies before modifying basic-rate policies.
  2. Test 802.11v behavior across actual client firmware before depending on steering.
  3. Validate roaming thresholds with representative scanning devices during walk tests.
  4. Distinguish 802.11k neighbor assistance from client roaming policy in technical training.

Explanation

Correct Answer

B:

Test 802.11v behavior across actual client firmware before depending on steering. This repeatable safeguard addresses the mechanism—802.11v BSS transition mechanisms provide guidance that clients may not follow—and reduces the chance that the specific fault recurs.

Incorrect Answers

A:

Baseline low-rate client dependencies before modifying basic-rate policies. This protects against another issue—a retail WLAN design uses one shared 802.11b basic-rate setting everywhere and then reports excessive airtime usage by low-rate devices—but is not the most direct prevention for the WLAN administrator assumes every 802.11v transition suggestion automatically disassociates a reluctant client.

C:

Validate roaming thresholds with representative scanning devices during walk tests. This protects against another issue—a warehouse scanner clings to a weak distant AP while a nearby AP has better SNR—but is not the most direct prevention for the WLAN administrator assumes every 802.11v transition suggestion automatically disassociates a reluctant client.

D:

Distinguish 802.11k neighbor assistance from client roaming policy in technical training. This protects against another issue—an engineer expects 802.11k neighbor reports to forcibly move a station to the closest AP—but is not the most direct prevention for the WLAN administrator assumes every 802.11v transition suggestion automatically disassociates a reluctant client.

Question 761

At a regional research campus, a specialist is investigating the following condition during a security policy review: After an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding. What should the team do FIRST to resolve this issue?

  1. Correct the site and template binding before allowing the replacement to serve production clients.
  2. Design supported Edge cluster redundancy, throughput capacity and recovery behavior for the critical WLANs.
  3. Enable and test the appropriate WLAN-disable behavior when the required Mist tunnel fails.
  4. Review per-WLAN and per-VLAN tunnel or local breakout mappings and correct traffic separation.

Explanation

Correct Answer

C:

Enable and test the appropriate WLAN-disable behavior when the required Mist tunnel fails. It addresses the specific failure, after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding, by correcting the mechanism: tunneled WLAN availability and local SSID broadcast behavior can be separately configured. The expected verification is: the protected SSID becomes unavailable during the tunnel outage and resumes after approved recovery.

Incorrect Answers

A:

Correct the site and template binding before allowing the replacement to serve production clients. This change is suitable for another situation: an AP replacement inherits yesterday's unrelated template after a technician moves it without updating its site assignment. It does not directly address this case, where after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

B:

Design supported Edge cluster redundancy, throughput capacity and recovery behavior for the critical WLANs. This change is suitable for another situation: a single Mist Edge appliance is deployed without capacity headroom or failover for a campus that requires continued tunneled WLAN service. It does not directly address this case, where after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

D:

Review per-WLAN and per-VLAN tunnel or local breakout mappings and correct traffic separation. This change is suitable for another situation: a campus chooses Mist Edge for guest access but accidentally tunnels the production IoT VLAN to the guest DMZ. It does not directly address this case, where after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

Question 762

During follow-up testing at a regional research campus, engineers review a previously reported fault: After an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding. Which observation confirms resolution rather than an unrelated improvement?

  1. The protected SSID becomes unavailable during the tunnel outage and resumes after approved recovery.
  2. The AP resolves required management service names and reports online.
  3. A controlled member outage preserves intended client forwarding within accepted service limits.
  4. The AP builds its approved tunnel and central VLAN packets arrive while local breakout continues separately.

Explanation

Correct Answer

A:

The protected SSID becomes unavailable during the tunnel outage and resumes after approved recovery. This directly checks the outcome of the chosen remediation and confirms the problem was not merely hidden. The diagnostic issue was: tunneled WLAN availability and local SSID broadcast behavior can be separately configured.

Incorrect Answers

B:

The AP resolves required management service names and reports online. This would demonstrate a different scenario was fixed—an AP receives DHCP but cannot contact Mist due to a stale DNS resolver returned to its management interface—but does not validate recovery from after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

C:

A controlled member outage preserves intended client forwarding within accepted service limits. This would demonstrate a different scenario was fixed—a single Mist Edge appliance is deployed without capacity headroom or failover for a campus that requires continued tunneled WLAN service—but does not validate recovery from after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

D:

The AP builds its approved tunnel and central VLAN packets arrive while local breakout continues separately. This would demonstrate a different scenario was fixed—a remote AP cannot establish a Mist Edge tunnel even though its normal local bridged guest WLAN works—but does not validate recovery from after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

Question 763

At a regional research campus, the wireless team observes: After an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding. Which underlying mechanism BEST explains the reported condition?

  1. Successful local forwarding does not prove that a centralized L2TPv3 path is reachable.
  2. Tunneled WLAN availability and local SSID broadcast behavior can be separately configured.
  3. IP connectivity alone does not ensure that cloud service FQDNs can be resolved.
  4. Mist Edge forwarding selection must match each WLAN and VLAN's security policy.

Explanation

Correct Answer

B:

Tunneled WLAN availability and local SSID broadcast behavior can be separately configured. This mechanism links the observed condition—after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding—to the corrective step: enable and test the appropriate WLAN-disable behavior when the required Mist tunnel fails.

Incorrect Answers

A:

Successful local forwarding does not prove that a centralized L2TPv3 path is reachable. This explains a different WLAN problem: a remote AP cannot establish a Mist Edge tunnel even though its normal local bridged guest WLAN works. The stated incident requires a different causal mechanism.

C:

IP connectivity alone does not ensure that cloud service FQDNs can be resolved. This explains a different WLAN problem: an AP receives DHCP but cannot contact Mist due to a stale DNS resolver returned to its management interface. The stated incident requires a different causal mechanism.

D:

Mist Edge forwarding selection must match each WLAN and VLAN's security policy. This explains a different WLAN problem: a campus chooses Mist Edge for guest access but accidentally tunnels the production IoT VLAN to the guest DMZ. The stated incident requires a different causal mechanism.

Question 764

At a regional research campus, an issue has been corrected: After an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding. Which repeatable control should the team add to prevent it from returning?

  1. Include operational AP state checks after every high-impact template change.
  2. Document client tunnel termination and central security controls in Mist WLAN designs.
  3. Maintain an approved WLAN-to-VLAN-to-tunnel routing matrix.
  4. Include Mist tunnel-loss fail-closed tests in security acceptance.

Explanation

Correct Answer

D:

Include Mist tunnel-loss fail-closed tests in security acceptance. This repeatable safeguard addresses the mechanism—tunneled WLAN availability and local SSID broadcast behavior can be separately configured—and reduces the chance that the specific fault recurs.

Incorrect Answers

A:

Include operational AP state checks after every high-impact template change. This protects against another issue—an organization change is approved but the affected AP has been offline for days and still uses an old WLAN policy—but is not the most direct prevention for after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

B:

Document client tunnel termination and central security controls in Mist WLAN designs. This protects against another issue—a corporate WLAN must carry client VLANs to a central data center, but the design expects Mist cloud analytics to terminate the data tunnel—but is not the most direct prevention for after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

C:

Maintain an approved WLAN-to-VLAN-to-tunnel routing matrix. This protects against another issue—a campus chooses Mist Edge for guest access but accidentally tunnels the production IoT VLAN to the guest DMZ—but is not the most direct prevention for after an Edge tunnel failure, a sensitive corporate WLAN remains active even though policy requires fail-closed tunneled forwarding.

Question 765

At an industrial warehouse, a specialist is investigating the following condition during a wireless troubleshooting call: A warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet. What should the team do FIRST to resolve this issue?

  1. Verify the selected PSK lookup mode and make the authorized RADIUS service accessible or restore the approved local design.
  2. Use supported MPSK roles or mappings to assign approved group-specific VLANs.
  3. Create properly scoped WxLAN role-to-VLAN overrides with per-site VLAN labels and required AP support.
  4. Use supported unique or grouped MPSKs and revoke the compromised key with minimal impact.

Explanation

Correct Answer

D:

Use supported unique or grouped MPSKs and revoke the compromised key with minimal impact. It addresses the specific failure, a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet, by correcting the mechanism: a global PSK creates an unnecessary shared credential and broad revocation impact. The expected verification is: the exposed device key fails while unaffected device keys continue to work on the same SSID.

Incorrect Answers

A:

Verify the selected PSK lookup mode and make the authorized RADIUS service accessible or restore the approved local design. This change is suitable for another situation: a WLAN moves from a small local MPSK inventory to external RADIUS-backed PSK lookup, but the RADIUS service is unreachable. It does not directly address this case, where a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

B:

Use supported MPSK roles or mappings to assign approved group-specific VLANs. This change is suitable for another situation: two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication. It does not directly address this case, where a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

C:

Create properly scoped WxLAN role-to-VLAN overrides with per-site VLAN labels and required AP support. This change is suitable for another situation: a company uses an MPSK user role for different VLANs at two sites, but the central policy pins both sites to the same VLAN. It does not directly address this case, where a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

Question 766

During follow-up testing at an industrial warehouse, engineers review a previously reported fault: A warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet. Which observation confirms resolution rather than an unrelated improvement?

  1. The supported AP accepts the configured WPA3 MPSK mode and test stations authenticate.
  2. Devices authenticate using the intended lookup source and corresponding policy without fallback confusion.
  3. The exposed device key fails while unaffected device keys continue to work on the same SSID.
  4. Compliant managed clients authenticate successfully and reject an untrusted test server.

Explanation

Correct Answer

C:

The exposed device key fails while unaffected device keys continue to work on the same SSID. This directly checks the outcome of the chosen remediation and confirms the problem was not merely hidden. The diagnostic issue was: a global PSK creates an unnecessary shared credential and broad revocation impact.

Incorrect Answers

A:

The supported AP accepts the configured WPA3 MPSK mode and test stations authenticate. This would demonstrate a different scenario was fixed—a site configures multiple passphrases with WPA3 on AP firmware that lacks the required support—but does not validate recovery from a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

B:

Devices authenticate using the intended lookup source and corresponding policy without fallback confusion. This would demonstrate a different scenario was fixed—a WLAN moves from a small local MPSK inventory to external RADIUS-backed PSK lookup, but the RADIUS service is unreachable—but does not validate recovery from a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

D:

Compliant managed clients authenticate successfully and reject an untrusted test server. This would demonstrate a different scenario was fixed—a site advertises WPA3-Enterprise but its RADIUS backend certificate cannot be validated by managed clients—but does not validate recovery from a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

Question 767

At an industrial warehouse, the wireless team observes: A warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet. Which underlying mechanism BEST explains the reported condition?

  1. MPSK functionality can vary by WPA security mode and AP software version.
  2. A global PSK creates an unnecessary shared credential and broad revocation impact.
  3. SSID similarity alone does not establish that a detected radio is an attacker-controlled rogue.
  4. Local key lookup and RADIUS-backed PSK lookup have different runtime service dependencies.

Explanation

Correct Answer

B:

A global PSK creates an unnecessary shared credential and broad revocation impact. This mechanism links the observed condition—a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet—to the corrective step: use supported unique or grouped MPSKs and revoke the compromised key with minimal impact.

Incorrect Answers

A:

MPSK functionality can vary by WPA security mode and AP software version. This explains a different WLAN problem: a site configures multiple passphrases with WPA3 on AP firmware that lacks the required support. The stated incident requires a different causal mechanism.

C:

SSID similarity alone does not establish that a detected radio is an attacker-controlled rogue. This explains a different WLAN problem: a security administrator sees an unknown AP broadcasting the corporate SSID and immediately disables every legitimate AP in the site. The stated incident requires a different causal mechanism.

D:

Local key lookup and RADIUS-backed PSK lookup have different runtime service dependencies. This explains a different WLAN problem: a WLAN moves from a small local MPSK inventory to external RADIUS-backed PSK lookup, but the RADIUS service is unreachable. The stated incident requires a different causal mechanism.

Question 768

At an industrial warehouse, an issue has been corrected: A warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet. Which repeatable control should the team add to prevent it from returning?

  1. Assign manageable PSK identities and rotation ownership per IoT device group.
  2. Schedule expiry and rotation checks for temporary MPSK assignments.
  3. Validate WPA3 MPSK firmware requirements before policy rollout.
  4. Test each SSID's VLAN end to end after wired-port changes.

Explanation

Correct Answer

A:

Assign manageable PSK identities and rotation ownership per IoT device group. This repeatable safeguard addresses the mechanism—a global PSK creates an unnecessary shared credential and broad revocation impact—and reduces the chance that the specific fault recurs.

Incorrect Answers

B:

Schedule expiry and rotation checks for temporary MPSK assignments. This protects against another issue—a terminated contractor's MPSK still grants WLAN access months after their authorized visit ended—but is not the most direct prevention for a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

C:

Validate WPA3 MPSK firmware requirements before policy rollout. This protects against another issue—a site configures multiple passphrases with WPA3 on AP firmware that lacks the required support—but is not the most direct prevention for a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

D:

Test each SSID's VLAN end to end after wired-port changes. This protects against another issue—an SSID authenticates clients but its local bridge VLAN is absent from the AP's switchport trunk—but is not the most direct prevention for a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet.

Question 769

At a regional research campus, a specialist is investigating the following condition during a security policy review: Clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration. What should the team do FIRST to resolve this issue?

  1. Investigate DHCP service reachability and relay settings using client-journey failure stages.
  2. Trace post-connect DNS responses and authorized resolver reachability for the affected SSID.
  3. Analyze roaming/client-security transitions for that class and repair the compatible authentication configuration.
  4. Inspect SLE compliance by actual affected client cohort, SSID and time period.

Explanation

Correct Answer

A:

Investigate DHCP service reachability and relay settings using client-journey failure stages. It addresses the specific failure, clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration, by correcting the mechanism: address assignment is a separate connection-stage dependency following successful authentication. The expected verification is: lease acquisition completes within the intended SLE after DHCP path correction.

Incorrect Answers

B:

Trace post-connect DNS responses and authorized resolver reachability for the affected SSID. This change is suitable for another situation: wireless users can receive an IP address but experience long delays resolving internal applications by hostname. It does not directly address this case, where clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration.

C:

Analyze roaming/client-security transitions for that class and repair the compatible authentication configuration. This change is suitable for another situation: a roaming SLE drops only for handhelds using one authentication method after a security policy edit. It does not directly address this case, where clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration.

D:

Inspect SLE compliance by actual affected client cohort, SSID and time period. This change is suitable for another situation: a Wi-Fi success report uses one healthy laptop as proof that all smartphones at the site meet the network experience goal. It does not directly address this case, where clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration.

Question 770

During follow-up testing at a regional research campus, engineers review a previously reported fault: Clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration. Which observation confirms resolution rather than an unrelated improvement?

  1. A sampled affected user connects end to end and the DHCP stage SLE recovers.
  2. Client-stage measurements fall within target after the identified association, authentication or DHCP issue is corrected.
  3. User experience improves when peak-channel contention falls at matched client load.
  4. Lease acquisition completes within the intended SLE after DHCP path correction.

Explanation

Correct Answer

D:

Lease acquisition completes within the intended SLE after DHCP path correction. This directly checks the outcome of the chosen remediation and confirms the problem was not merely hidden. The diagnostic issue was: address assignment is a separate connection-stage dependency following successful authentication.

Incorrect Answers

A:

A sampled affected user connects end to end and the DHCP stage SLE recovers. This would demonstrate a different scenario was fixed—an engineer closes a client connection incident after an AP returns online, though the users' DHCP failures continue—but does not validate recovery from clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration.

B:

Client-stage measurements fall within target after the identified association, authentication or DHCP issue is corrected. This would demonstrate a different scenario was fixed—a campus operations team reports green AP uptime while many clients exceed the acceptable wireless Time to Connect target—but does not validate recovery from clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration.

C:

User experience improves when peak-channel contention falls at matched client load. This would demonstrate a different scenario was fixed—a high-density WLAN reports unacceptable throughput while per-client RSSI and AP cloud connections remain normal—but does not validate recovery from clients associate and authenticate promptly but require many seconds to acquire DHCP leases after a VLAN migration.

Mist AI Wireless, Specialist (JNCIS-MistAI-Wireless) (JN0-452) Practice Tests