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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 79

Question 780

The team at a university campus has corrected this condition: A campus chooses Mist Edge for guest access but accidentally tunnels the production IoT VLAN to the guest DMZ. Which preventive practice BEST addresses the identified mechanism?

  1. Include management outage and local traffic tests in campus business-continuity exercises.
  2. Maintain an approved WLAN-to-VLAN-to-tunnel routing matrix.
  3. Include Mist tunnel-loss fail-closed tests in security acceptance.
  4. Test Edge failover and scale thresholds before onboarding additional tunneled sites.

Explanation

Correct Answer

B:

Maintain an approved WLAN-to-VLAN-to-tunnel routing matrix. This repeatable safeguard addresses the mechanism—mist Edge forwarding selection must match each WLAN and VLAN's security policy—and reduces the chance that the specific fault recurs.

Incorrect Answers

A:

Include management outage and local traffic tests in campus business-continuity exercises. This protects against another issue—a WAN outage makes the Mist portal unreachable and a technician assumes every locally bridged WLAN should immediately stop forwarding traffic—but is not the most direct prevention for a campus chooses Mist Edge for guest access but accidentally tunnels the production IoT VLAN to the guest DMZ.

C:

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

D:

Test Edge failover and scale thresholds before onboarding additional tunneled sites. This protects against another issue—a single Mist Edge appliance is deployed without capacity headroom or failover for a campus that requires continued tunneled WLAN service—but is not the most direct prevention for a campus chooses Mist Edge for guest access but accidentally tunnels the production IoT VLAN to the guest DMZ.

Question 781

During a preproduction change assessment at a financial institution branch, an administrator reports: Two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication. Which configuration or investigation step MOST directly corrects the problem?

  1. Use supported unique or grouped MPSKs and revoke the compromised key with minimal impact.
  2. Verify the selected PSK lookup mode and make the authorized RADIUS service accessible or restore the approved local design.
  3. Use supported MPSK roles or mappings to assign approved group-specific VLANs.
  4. Distinguish WIDS observation from authorized WIPS prevention capability and configure only supported permitted responses.

Explanation

Correct Answer

C:

Use supported MPSK roles or mappings to assign approved group-specific VLANs. It addresses the specific failure, two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication, by correcting the mechanism: key identity can support segmentation independently of SSID naming. The expected verification is: each sensor class uses its intended key and receives the correct isolated subnet.

Incorrect Answers

A:

Use supported unique or grouped MPSKs and revoke the compromised key with minimal impact. This change is suitable for another situation: a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet. It does not directly address this case, where two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

B:

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 two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

D:

Distinguish WIDS observation from authorized WIPS prevention capability and configure only supported permitted responses. This change is suitable for another situation: a campus enables wireless intrusion detection but expects it to automatically block every rogue transmitter without separate policy review. It does not directly address this case, where two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

Question 782

After a change at a financial institution branch, the original incident was: Two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication. Which evidence BEST verifies that the specific failure has been corrected?

  1. The intended client group matches the rule and receives the permitted resource list.
  2. The supported AP accepts the configured WPA3 MPSK mode and test stations authenticate.
  3. The retired key fails while active authorized keys remain effective on the site.
  4. Each sensor class uses its intended key and receives the correct isolated subnet.

Explanation

Correct Answer

D:

Each sensor class uses its intended key and receives the correct isolated subnet. This directly checks the outcome of the chosen remediation and confirms the problem was not merely hidden. The diagnostic issue was: key identity can support segmentation independently of SSID naming.

Incorrect Answers

A:

The intended client group matches the rule and receives the permitted resource list. This would demonstrate a different scenario was fixed—a WxLAN role policy names the correct employee group but none of the clients match because the corresponding label has the wrong RADIUS attribute—but does not validate recovery from two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

B:

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 two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

C:

The retired key fails while active authorized keys remain effective on the site. This would demonstrate a different scenario was fixed—a terminated contractor's MPSK still grants WLAN access months after their authorized visit ended—but does not validate recovery from two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

Question 783

A specialist reviewing a preproduction change assessment at a financial institution branch finds: Two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication. Which root cause is MOST consistent with the evidence?

  1. Key identity can support segmentation independently of SSID naming.
  2. Local key lookup and RADIUS-backed PSK lookup have different runtime service dependencies.
  3. A global PSK creates an unnecessary shared credential and broad revocation impact.
  4. The WLAN's default direct-access option does not enforce a required guest admission workflow.

Explanation

Correct Answer

A:

Key identity can support segmentation independently of SSID naming. This mechanism links the observed condition—two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication—to the corrective step: use supported MPSK roles or mappings to assign approved group-specific VLANs.

Incorrect Answers

B:

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.

C:

A global PSK creates an unnecessary shared credential and broad revocation impact. This explains a different WLAN problem: a warehouse shares one WPA2 password across all robots and cannot revoke one compromised unit without disrupting the fleet. The stated incident requires a different causal mechanism.

D:

The WLAN's default direct-access option does not enforce a required guest admission workflow. This explains a different WLAN problem: a public guest SSID uses direct access with no portal even though the business requires time-limited guest authorization. The stated incident requires a different causal mechanism.

Question 784

The team at a financial institution branch has corrected this condition: Two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication. Which preventive practice BEST addresses the identified mechanism?

  1. Validate WPA3 MPSK firmware requirements before policy rollout.
  2. Test different MPSK identities and their final VLAN assignments at acceptance.
  3. Prohibit weak wireless modes in production security baselines with managed exception handling.
  4. Schedule expiry and rotation checks for temporary MPSK assignments.

Explanation

Correct Answer

B:

Test different MPSK identities and their final VLAN assignments at acceptance. This repeatable safeguard addresses the mechanism—key identity can support segmentation independently of SSID naming—and reduces the chance that the specific fault recurs.

Incorrect Answers

A:

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 two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

C:

Prohibit weak wireless modes in production security baselines with managed exception handling. This protects against another issue—a technician downgrades a secure WLAN to WEP because one obsolete scanner fails modern authentication—but is not the most direct prevention for two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

D:

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 two classes of IoT sensors connect to one SSID but require separate VLANs even though they both use PSK authentication.

Question 785

During a service restoration exercise at a coastal resort, an administrator reports: Wireless users can receive an IP address but experience long delays resolving internal applications by hostname. Which configuration or investigation step MOST directly corrects the problem?

  1. Explain the experience-oriented SLE metric and compare compliant user minutes with infrastructure uptime separately.
  2. Trace post-connect DNS responses and authorized resolver reachability for the affected SSID.
  3. Filter site/AP firmware groups and matched time windows before attributing the problem to software.
  4. Check missing/deauthenticated devices and compare cohort sizes so the score cannot hide excluded clients.

Explanation

Correct Answer

B:

Trace post-connect DNS responses and authorized resolver reachability for the affected SSID. It addresses the specific failure, wireless users can receive an IP address but experience long delays resolving internal applications by hostname, by correcting the mechanism: dNS service degradation can make a healthy radio connection seem unusable. The expected verification is: name resolution succeeds at expected latency while association and DHCP remain healthy.

Incorrect Answers

A:

Explain the experience-oriented SLE metric and compare compliant user minutes with infrastructure uptime separately. This change is suitable for another situation: an SLE report says 95 percent of user minutes are good, but support interprets that as 95 percent of all APs working. It does not directly address this case, where wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

C:

Filter site/AP firmware groups and matched time windows before attributing the problem to software. This change is suitable for another situation: a new firmware is deployed to only a portion of the AP fleet, and service desk aggregates all WLAN users into one apparent failure pattern. It does not directly address this case, where wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

D:

Check missing/deauthenticated devices and compare cohort sizes so the score cannot hide excluded clients. This change is suitable for another situation: a site-level SLE improves after a WLAN change but a key group of older scanners fails entirely and disappears from the measured population. It does not directly address this case, where wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

Question 786

After a change at a coastal resort, the original incident was: Wireless users can receive an IP address but experience long delays resolving internal applications by hostname. Which evidence BEST verifies that the specific failure has been corrected?

  1. The relevant authentication latency and client success rate recover without RF hardware changes.
  2. The affected handheld cohort roams without repeated full-security delays or failed sessions.
  3. Name resolution succeeds at expected latency while association and DHCP remain healthy.
  4. Sensors remain associated across clinical wings while RF capacity policy respects documented exceptions.

Explanation

Correct Answer

C:

Name resolution succeeds at expected latency while association and DHCP remain healthy. This directly checks the outcome of the chosen remediation and confirms the problem was not merely hidden. The diagnostic issue was: dNS service degradation can make a healthy radio connection seem unusable.

Incorrect Answers

A:

The relevant authentication latency and client success rate recover without RF hardware changes. This would demonstrate a different scenario was fixed—a Wi-Fi Time to Connect degradation starts after RADIUS changes, but a technician replaces AP antennas—but does not validate recovery from wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

B:

The affected handheld cohort roams without repeated full-security delays or failed sessions. This would demonstrate a different scenario was fixed—a roaming SLE drops only for handhelds using one authentication method after a security policy edit—but does not validate recovery from wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

D:

Sensors remain associated across clinical wings while RF capacity policy respects documented exceptions. This would demonstrate a different scenario was fixed—a hospital with essential 2.4 GHz-only medical sensors enables automatic 2.4 GHz radio shutdown across sparsely covered wings—but does not validate recovery from wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

Question 787

A specialist reviewing a service restoration exercise at a coastal resort finds: Wireless users can receive an IP address but experience long delays resolving internal applications by hostname. Which root cause is MOST consistent with the evidence?

  1. A momentary RF snapshot may miss congestion represented in longer RRM history.
  2. AP availability recovery does not prove restoration of downstream address-assignment service.
  3. Identity processing delays can dominate onboarding despite healthy physical radio coverage.
  4. DNS service degradation can make a healthy radio connection seem unusable.

Explanation

Correct Answer

D:

DNS service degradation can make a healthy radio connection seem unusable. This mechanism links the observed condition—wireless users can receive an IP address but experience long delays resolving internal applications by hostname—to the corrective step: trace post-connect DNS responses and authorized resolver reachability for the affected SSID.

Incorrect Answers

A:

A momentary RF snapshot may miss congestion represented in longer RRM history. This explains a different WLAN problem: a team repeatedly forces a busy channel because its current interference screenshot is clean and ignores the same channel's repeated evening congestion. The stated incident requires a different causal mechanism.

B:

AP availability recovery does not prove restoration of downstream address-assignment service. This explains a different WLAN problem: an engineer closes a client connection incident after an AP returns online, though the users' DHCP failures continue. The stated incident requires a different causal mechanism.

C:

Identity processing delays can dominate onboarding despite healthy physical radio coverage. This explains a different WLAN problem: a Wi-Fi Time to Connect degradation starts after RADIUS changes, but a technician replaces AP antennas. The stated incident requires a different causal mechanism.

Question 788

The team at a coastal resort has corrected this condition: Wireless users can receive an IP address but experience long delays resolving internal applications by hostname. Which preventive practice BEST addresses the identified mechanism?

  1. Include DNS response tests in WLAN incident runbooks.
  2. Use post-remediation client-journey acceptance before closing incidents.
  3. Review radio-event history when retry trends change after deployment activity.
  4. Run busy-hour capacity checks before adding more APs or raising power.

Explanation

Correct Answer

A:

Include DNS response tests in WLAN incident runbooks. This repeatable safeguard addresses the mechanism—dNS service degradation can make a healthy radio connection seem unusable—and reduces the chance that the specific fault recurs.

Incorrect Answers

B:

Use post-remediation client-journey acceptance before closing incidents. This protects against another issue—an engineer closes a client connection incident after an AP returns online, though the users' DHCP failures continue—but is not the most direct prevention for wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

C:

Review radio-event history when retry trends change after deployment activity. This protects against another issue—a WLAN's aggregate retry rate rises after AP density increases, but no one inspects spectrum and radio event history—but is not the most direct prevention for wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

D:

Run busy-hour capacity checks before adding more APs or raising power. This protects against another issue—a high-density WLAN reports unacceptable throughput while per-client RSSI and AP cloud connections remain normal—but is not the most direct prevention for wireless users can receive an IP address but experience long delays resolving internal applications by hostname.

Question 789

During an RF capacity test at a retail distribution center, the HPE Juniper WLAN team observes: A roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet. Which technical action BEST addresses the cause while maintaining approved security and service?

  1. Measure multi-user contention and assess OFDMA or MU-MIMO capacity with capable clients under realistic load.
  2. Pilot an 802.11r-compatible WLAN profile or separate supported legacy SSIDs as needed.
  3. Preserve appropriate Layer 2 mobility or design an authorized session-continuity solution across VLANs.
  4. Evaluate supported 802.11r fast transition with compatible clients and verified authentication policy.

Explanation

Correct Answer

C:

Preserve appropriate Layer 2 mobility or design an authorized session-continuity solution across VLANs. It addresses the specific failure, a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet, by correcting the mechanism: an RF handoff can succeed while a subnet change disrupts IP-based application state. The expected verification is: the moving client retains the intended service session during controlled cross-AP testing.

Incorrect Answers

A:

Measure multi-user contention and assess OFDMA or MU-MIMO capacity with capable clients under realistic load. This change is suitable for another situation: a large conference WLAN tests excellent single-client throughput but struggles when dozens of clients transmit at once. It does not directly address this case, where a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet.

B:

Pilot an 802.11r-compatible WLAN profile or separate supported legacy SSIDs as needed. This change is suitable for another situation: a WLAN redesign enables fast transition for every SSID without testing legacy barcode readers that reject the advertised negotiation. It does not directly address this case, where a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet.

D:

Evaluate supported 802.11r fast transition with compatible clients and verified authentication policy. This change is suitable for another situation: a mobile voice handset pauses during AP transitions because full authentication repeats at every roaming event. It does not directly address this case, where a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet.

Question 790

The WLAN team at a retail distribution center has addressed this issue: A roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet. Which measurable observation would MOST convincingly demonstrate successful remediation?

  1. New APs receive power, valid addressing and permitted cloud management reachability.
  2. Roam tests show faster candidate discovery without hiding required AP channels.
  3. Logs show the station accepting or declining steering recommendations according to client behavior.
  4. The moving client retains the intended service session during controlled cross-AP testing.

Explanation

Correct Answer

D:

The moving client retains the intended service session during controlled cross-AP testing. This directly checks the outcome of the chosen remediation and confirms the problem was not merely hidden. The diagnostic issue was: an RF handoff can succeed while a subnet change disrupts IP-based application state.

Incorrect Answers

A:

New APs receive power, valid addressing and permitted cloud management reachability. This would demonstrate a different scenario was fixed—a site turns on new access points before verifying switch ports, PoE budget and DHCP readiness—but does not validate recovery from a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet.

B:

Roam tests show faster candidate discovery without hiding required AP channels. This would demonstrate a different scenario was fixed—a guest smartphone delays joining a new AP because it must scan all channels before finding a candidate—but does not validate recovery from a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet.

C:

Logs show the station accepting or declining steering recommendations according to client behavior. This would demonstrate a different scenario was fixed—the WLAN administrator assumes every 802.11v transition suggestion automatically disassociates a reluctant client—but does not validate recovery from a roaming audit sees good signal after handoff but an application session still breaks because clients get a new IP subnet.

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