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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 55

Question 540

An enterprise network designer recommends: Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the RADIUS Access-Reject action. The failing client can follow the configured rejection behavior instead of the nonresponse guest path.

Incorrect Answers

A:

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.

C:

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.

D:

This other case would be better matched to Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch. The laptop can exchange EAP authentication information before ordinary network access is granted.

Question 541

A previously authenticated workstation no longer meets the expected policy but remains connected for long periods. Which Junos networking action or protocol decision best addresses this requirement?

  1. Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server.
  2. Apply the appropriate RADIUS Access-Accept authorization information at the switch.
  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

C:

This action addresses 802.1X reauthentication. A connected session can be reevaluated instead of retaining its original authorization indefinitely.

Incorrect Answers

A:

That action targets 802.1X authenticator role: The switch mediates EAP exchanges and enforces the authentication result on the port. It does not directly resolve the stated 802.1X reauthentication requirement.

B:

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 reauthentication 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 reauthentication requirement.

Question 542

A Junos network engineer takes this step: Configure a supported periodic authentication check or reauthentication policy as appropriate. Which outcome most directly follows?

  1. The operator can determine whether the client is unauthorized, pending, or assigned a policy.
  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. A connected session can be reevaluated instead of retaining its original authorization indefinitely.

Explanation

Correct Answer

D:

This is the direct result of the 802.1X reauthentication decision: A connected session can be reevaluated instead of retaining its original authorization indefinitely.

Incorrect Answers

A:

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.

B:

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

C:

This outcome is associated with 802.1X authenticator role (Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server.), not the specified action.

Question 543

A previously authenticated workstation no longer meets the expected policy but remains connected for long periods. A colleague instead suggests: Inspect Junos 802.1X session status and authorization details for that interface. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses 802.1X reauthentication. A connected session can be reevaluated instead of retaining its original authorization indefinitely.

Incorrect Answers

B:

That alternative applies to 802.1X authenticator role instead. The switch mediates EAP exchanges and enforces the authentication result on the port.

C:

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

D:

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

Question 544

An enterprise network designer recommends: Configure a supported periodic authentication check or reauthentication policy as appropriate. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the 802.1X reauthentication action. A connected session can be reevaluated instead of retaining its original authorization indefinitely.

Incorrect Answers

A:

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.

C:

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.

D:

This other case would be better matched to Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server. The switch mediates EAP exchanges and enforces the authentication result on the port.

Question 545

An IP phone and a downstream computer share one access port but require distinct voice and data session policy. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect EAPOL exchange between the supplicant and the switch authenticator.
  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. Treat the RADIUS Access-Reject as an authentication failure rather than as a missing EAP supplicant.

Explanation

Correct Answer

C:

This action addresses 802.1X multi-domain. The port can authorize the separate device roles according to the intended policy.

Incorrect Answers

A:

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 multi-domain requirement.

B:

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 802.1X multi-domain requirement.

D:

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 multi-domain requirement.

Question 546

A Junos network engineer takes this step: Use a supported multi-domain 802.1X access configuration for voice and data devices. Which outcome most directly follows?

  1. The operator can determine whether endpoint authentication signaling starts at Layer 2.
  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 port can authorize the separate device roles according to the intended policy.

Explanation

Correct Answer

D:

This is the direct result of the 802.1X multi-domain decision: The port can authorize the separate device roles according to the intended policy.

Incorrect Answers

A:

This outcome is associated with EAPOL start (Inspect EAPOL exchange between the supplicant and the switch authenticator.), 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.

Question 547

An IP phone and a downstream computer share one access port but require distinct voice and data session policy. A colleague instead suggests: Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses 802.1X multi-domain. The port can authorize the separate device roles according to the intended policy.

Incorrect Answers

B:

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

C:

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

D:

That alternative applies to 802.1X supplicant instead. The laptop can exchange EAP authentication information before ordinary network access is granted.

Question 548

An enterprise network designer recommends: Use a supported multi-domain 802.1X access configuration for voice and data devices. Which situation most clearly calls for this action?

  1. A client connects to an 802.1X-enabled port but no EAP session begins even though the link is up.
  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 corporate laptop must present credentials before a switch allows regular data access on its Ethernet port.

Explanation

Correct Answer

B:

This case requires the 802.1X multi-domain action. The port can authorize the separate device roles according to the intended policy.

Incorrect Answers

A:

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.

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 Enable an 802.1X supplicant on the endpoint and a compatible authentication policy on the switch. The laptop can exchange EAP authentication information before ordinary network access is granted.

Question 549

A computer cannot reach its enterprise VLAN after connecting to an authenticated switch port, though link LEDs are healthy. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

A:

This action addresses 802.1X session visibility. The operator can determine whether the client is unauthorized, pending, or assigned a policy.

Incorrect Answers

B:

That action targets 802.1X authenticator role: The switch mediates EAP exchanges and enforces the authentication result on the port. It does not directly resolve the stated 802.1X session visibility requirement.

C:

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 session visibility requirement.

D:

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 session visibility requirement.

Question 550

A Junos network engineer takes this step: Inspect Junos 802.1X session status and authorization details for that interface. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the 802.1X session visibility decision: The operator can determine whether the client is unauthorized, pending, or assigned a policy.

Incorrect Answers

A:

This outcome is associated with 802.1X authenticator role (Configure the Junos switch as the 802.1X authenticator using an authorized backend RADIUS server.), not the specified action.

C:

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 reauthentication (Configure a supported periodic authentication check or reauthentication policy as appropriate.), not the specified action.

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