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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 53

Question 520

An enterprise network designer recommends: Inspect that VLAN's VSTP port state and topology information on the relevant switches. Which situation most clearly calls for this action?

  1. A redundant trunk is activated after a failure and only one VLAN remains unable to forward across the new path.
  2. An access VLAN has two redundant uplinks forming a physical ring and requires a VLAN-specific loop-free topology.
  3. An inter-switch trunk carries multiple VLANs but one VLAN does not participate in the expected VSTP instance.
  4. An operator believes a VSTP-discarding interface indicates a defective cable despite healthy link status.

Explanation

Correct Answer

A:

This case requires the VSTP convergence verification action. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

Incorrect Answers

B:

This other case would be better matched to Use supported VSTP to calculate forwarding and discarding roles for that VLAN. The VLAN avoids persistent bridging loops while keeping a backup path available.

C:

This other case would be better matched to Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links. The VLAN can have its intended spanning-tree state on the shared trunk.

D:

This other case would be better matched to Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault. The team can distinguish deliberate loop prevention from physical failure.

Question 521

A corporate laptop must present credentials before a switch allows regular data access on its Ethernet port. Which Junos networking action or protocol decision best addresses this requirement?

  1. Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant.
  2. Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch.
  3. Use a supported multi-domain 802.1X access configuration for voice and data devices.
  4. Inspect EAPOL exchange between the supplicant and the switch authenticator.

Explanation

Correct Answer

B:

This action addresses 802.1X supplicant. The laptop can exchange EAP authentication information before ordinary network access is granted.

Incorrect Answers

A:

That action targets RADIUS Access-Reject: The failing client can follow the configured rejection behavior instead of the nonresponse guest path. It does not directly resolve the stated 802.1X supplicant requirement.

C:

That action targets 802.1X multi-domain: The port can authorize the separate device roles according to the intended policy. It does not directly resolve the stated 802.1X supplicant requirement.

D:

That action targets EAPOL start: The operator can determine whether endpoint authentication signaling starts at Layer 2. It does not directly resolve the stated 802.1X supplicant requirement.

Question 522

A Junos network engineer takes this step: Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch. Which outcome most directly follows?

  1. The failing client can follow the configured rejection behavior instead of the nonresponse guest path.
  2. The operator can determine whether endpoint authentication signaling starts at Layer 2.
  3. The laptop can exchange EAP authentication information before ordinary network access is granted.
  4. The port can authorize the separate device roles according to the intended policy.

Explanation

Correct Answer

C:

This is the direct result of the 802.1X supplicant decision: The laptop can exchange EAP authentication information before ordinary network access is granted.

Incorrect Answers

A:

This outcome is associated with RADIUS Access-Reject (Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant.), not the specified action.

B:

This outcome is associated with EAPOL start (Inspect EAPOL exchange between the supplicant and the switch authenticator.), not the specified action.

D:

This outcome is associated with 802.1X multi-domain (Use a supported multi-domain 802.1X access configuration for voice and data devices.), not the specified action.

Question 523

A corporate laptop must present credentials before a switch allows regular data access on its Ethernet port. A colleague instead suggests: Inspect EAPOL exchange between the supplicant and the switch authenticator. Which corrective approach most directly addresses the original issue?

  1. Inspect EAPOL exchange between the supplicant and the switch authenticator.
  2. Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant.
  3. Use a supported multi-domain 802.1X access configuration for voice and data devices.
  4. Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch.

Explanation

Correct Answer

D:

This corrective choice addresses 802.1X supplicant. The laptop can exchange EAP authentication information before ordinary network access is granted.

Incorrect Answers

A:

That alternative applies to EAPOL start instead. The operator can determine whether endpoint authentication signaling starts at Layer 2.

B:

That alternative applies to RADIUS Access-Reject instead. The failing client can follow the configured rejection behavior instead of the nonresponse guest path.

C:

That alternative applies to 802.1X multi-domain instead. The port can authorize the separate device roles according to the intended policy.

Question 524

An enterprise network designer recommends: Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch. Which situation most clearly calls for this action?

  1. A corporate laptop must present credentials before a switch allows regular data access on its Ethernet port.
  2. An IP phone and a downstream computer share one access port but require distinct voice and data session policy.
  3. A client submits invalid credentials and a security administrator wants to distinguish denial from a silent nonresponsive guest.
  4. A client connects to an 802.1X-enabled port but no EAP session begins even though the link is up.

Explanation

Correct Answer

A:

This case requires the 802.1X supplicant action. The laptop can exchange EAP authentication information before ordinary network access is granted.

Incorrect Answers

B:

This other case would be better matched to Use a supported multi-domain 802.1X access configuration for voice and data devices. The port can authorize the separate device roles according to the intended policy.

C:

This other case would be better matched to Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant. The failing client can follow the configured rejection behavior instead of the nonresponse guest path.

D:

This other case would be better matched to Inspect EAPOL exchange between the supplicant and the switch authenticator. The operator can determine whether endpoint authentication signaling starts at Layer 2.

Question 525

A network architect mistakenly expects the access switch to validate employee passwords locally instead of relaying requests to RADIUS. Which Junos networking action or protocol decision best addresses this requirement?

  1. Apply the appropriate RADIUS Access-Accept authorization information at the switch.
  2. Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server.
  3. Configure a supported periodic authentication check or reauthentication policy as appropriate.
  4. Inspect Junos 802.1X session status and authorization details for that interface.

Explanation

Correct Answer

B:

This action addresses 802.1X authenticator role. The switch mediates EAP exchanges and enforces the authentication result on the port.

Incorrect Answers

A:

That action targets RADIUS Access-Accept: An authenticated session can enter its permitted forwarding state and assigned network policy. It does not directly resolve the stated 802.1X authenticator role requirement.

C:

That action targets 802.1X reauthentication: A connected session can be reevaluated instead of retaining its original authorization indefinitely. It does not directly resolve the stated 802.1X authenticator role requirement.

D:

That action targets 802.1X session visibility: The operator can determine whether the client is unauthorized, pending, or assigned a policy. It does not directly resolve the stated 802.1X authenticator role requirement.

Question 526

A Junos network engineer takes this step: Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server. Which outcome most directly follows?

  1. A connected session can be reevaluated instead of retaining its original authorization indefinitely.
  2. An authenticated session can enter its permitted forwarding state and assigned network policy.
  3. The switch mediates EAP exchanges and enforces the authentication result on the port.
  4. The operator can determine whether the client is unauthorized, pending, or assigned a policy.

Explanation

Correct Answer

C:

This is the direct result of the 802.1X authenticator role decision: The switch mediates EAP exchanges and enforces the authentication result on the port.

Incorrect Answers

A:

This outcome is associated with 802.1X reauthentication (Configure a supported periodic authentication check or reauthentication policy as appropriate.), not the specified action.

B:

This outcome is associated with RADIUS Access-Accept (Apply the appropriate RADIUS Access-Accept authorization information at the switch.), not the specified action.

D:

This outcome is associated with 802.1X session visibility (Inspect Junos 802.1X session status and authorization details for that interface.), not the specified action.

Question 527

A network architect mistakenly expects the access switch to validate employee passwords locally instead of relaying requests to RADIUS. A colleague instead suggests: Apply the appropriate RADIUS Access-Accept authorization information at the switch. Which corrective approach most directly addresses the original issue?

  1. Inspect Junos 802.1X session status and authorization details for that interface.
  2. Configure a supported periodic authentication check or reauthentication policy as appropriate.
  3. Apply the appropriate RADIUS Access-Accept authorization information at the switch.
  4. Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server.

Explanation

Correct Answer

D:

This corrective choice addresses 802.1X authenticator role. The switch mediates EAP exchanges and enforces the authentication result on the port.

Incorrect Answers

A:

That alternative applies to 802.1X session visibility instead. The operator can determine whether the client is unauthorized, pending, or assigned a policy.

B:

That alternative applies to 802.1X reauthentication instead. A connected session can be reevaluated instead of retaining its original authorization indefinitely.

C:

That alternative applies to RADIUS Access-Accept instead. An authenticated session can enter its permitted forwarding state and assigned network policy.

Question 528

An enterprise network designer recommends: Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server. Which situation most clearly calls for this action?

  1. A network architect mistakenly expects the access switch to validate employee passwords locally instead of relaying requests to RADIUS.
  2. A known employee successfully completes EAP authentication and the network must permit the authorized access profile.
  3. A computer cannot reach its enterprise VLAN after connecting to an authenticated switch port, though link LEDs are healthy.
  4. A previously authenticated workstation no longer meets the expected policy but remains connected for long periods.

Explanation

Correct Answer

A:

This case requires the 802.1X authenticator role action. The switch mediates EAP exchanges and enforces the authentication result on the port.

Incorrect Answers

B:

This other case would be better matched to Apply the appropriate RADIUS Access-Accept authorization information at the switch. An authenticated session can enter its permitted forwarding state and assigned network policy.

C:

This other case would be better matched to Inspect Junos 802.1X session status and authorization details for that interface. The operator can determine whether the client is unauthorized, pending, or assigned a policy.

D:

This other case would be better matched to Configure a supported periodic authentication check or reauthentication policy as appropriate. A connected session can be reevaluated instead of retaining its original authorization indefinitely.

Question 529

A client connects to an 802.1X-enabled port but no EAP session begins even though the link is up. Which Junos networking action or protocol decision best addresses this requirement?

  1. Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant.
  2. Use a supported multi-domain 802.1X access configuration for voice and data devices.
  3. Inspect EAPOL exchange between the supplicant and the switch authenticator.
  4. Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch.

Explanation

Correct Answer

C:

This action addresses EAPOL start. The operator can determine whether endpoint authentication signaling starts at Layer 2.

Incorrect Answers

A:

That action targets RADIUS Access-Reject: The failing client can follow the configured rejection behavior instead of the nonresponse guest path. It does not directly resolve the stated EAPOL start requirement.

B:

That action targets 802.1X multi-domain: The port can authorize the separate device roles according to the intended policy. It does not directly resolve the stated EAPOL start requirement.

D:

That action targets 802.1X supplicant: The laptop can exchange EAP authentication information before ordinary network access is granted. It does not directly resolve the stated EAPOL start requirement.

Question 530

A Junos network engineer takes this step: Inspect EAPOL exchange between the supplicant and the switch authenticator. Which outcome most directly follows?

  1. The port can authorize the separate device roles according to the intended policy.
  2. The laptop can exchange EAP authentication information before ordinary network access is granted.
  3. The failing client can follow the configured rejection behavior instead of the nonresponse guest path.
  4. The operator can determine whether endpoint authentication signaling starts at Layer 2.

Explanation

Correct Answer

D:

This is the direct result of the EAPOL start decision: The operator can determine whether endpoint authentication signaling starts at Layer 2.

Incorrect Answers

A:

This outcome is associated with 802.1X multi-domain (Use a supported multi-domain 802.1X access configuration for voice and data devices.), not the specified action.

B:

This outcome is associated with 802.1X supplicant (Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch.), not the specified action.

C:

This outcome is associated with RADIUS Access-Reject (Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant.), not the specified action.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests