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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 59

Question 580

An enterprise network designer recommends: Correct the approved RADIUS VLAN authorization attributes and switch support for them. Which situation most clearly calls for this action?

  1. Visitors use a web browser on the guest network and must accept terms or authenticate through a login page before unrestricted use.
  2. A RADIUS-authenticated switch user is authorized but lands in the wrong VLAN because the returned assignment attributes are misconfigured.
  3. An endpoint supports 802.1X but the access switch processes only MAC RADIUS, contrary to the planned primary method.
  4. A headless network printer cannot run an 802.1X supplicant but the access policy still requires server-mediated admission.

Explanation

Correct Answer

B:

This case requires the RADIUS attributes action. The successful authentication can apply the intended dynamic VLAN authorization.

Incorrect Answers

A:

This other case would be better matched to Use a supported captive portal authentication workflow for the guest access design. Browser users can complete the web-based admission process before receiving wider access.

C:

This other case would be better matched to Configure an appropriate order among dot1x, MAC RADIUS and captive-portal methods. The preferred authentication method is attempted according to the intended policy sequence.

D:

This other case would be better matched to Use MAC RADIUS authentication for the approved printer MAC on its switch interface. The server can evaluate the device identity using MAC-based authentication rather than EAP credentials.

Question 581

An operator proposes treating MAC-only admission as equivalent to strong certificate-based user authentication. Which Junos networking action or protocol decision best addresses this requirement?

  1. Correct the authorized MAC RADIUS identity record after verifying the endpoint's true address.
  2. Recognize the spoofing limitations of MAC identity and use stronger 802.1X when possible.
  3. Use a supported authentication-order design that tries 802.1X and then permitted MAC authentication where appropriate.
  4. Inspect captive portal redirection, DNS reachability and HTTP/HTTPS interception policy.

Explanation

Correct Answer

B:

This action addresses MAC spoofing limitation. The security design does not mistake a changeable hardware address for a cryptographic credential.

Incorrect Answers

A:

That action targets MAC RADIUS entry mismatch: The switch's MAC-based request can match the expected authorized device record. It does not directly resolve the stated MAC spoofing limitation requirement.

C:

That action targets 802.1X to MAC fallback: Legacy devices can follow a controlled alternative rather than bypassing all network admission checks. It does not directly resolve the stated MAC spoofing limitation requirement.

D:

That action targets Captive portal redirect failure: The portal can become reachable for an unauthenticated browser session. It does not directly resolve the stated MAC spoofing limitation requirement.

Question 582

A Junos network engineer takes this step: Recognize the spoofing limitations of MAC identity and use stronger 802.1X when possible. Which outcome most directly follows?

  1. The portal can become reachable for an unauthenticated browser session.
  2. Legacy devices can follow a controlled alternative rather than bypassing all network admission checks.
  3. The security design does not mistake a changeable hardware address for a cryptographic credential.
  4. The switch's MAC-based request can match the expected authorized device record.

Explanation

Correct Answer

C:

This is the direct result of the MAC spoofing limitation decision: The security design does not mistake a changeable hardware address for a cryptographic credential.

Incorrect Answers

A:

This outcome is associated with Captive portal redirect failure (Inspect captive portal redirection, DNS reachability and HTTP/HTTPS interception policy.), not the specified action.

B:

This outcome is associated with 802.1X to MAC fallback (Use a supported authentication-order design that tries 802.1X and then permitted MAC authentication where appropriate.), not the specified action.

D:

This outcome is associated with MAC RADIUS entry mismatch (Correct the authorized MAC RADIUS identity record after verifying the endpoint's true address.), not the specified action.

Question 583

An operator proposes treating MAC-only admission as equivalent to strong certificate-based user authentication. A colleague instead suggests: Correct the authorized MAC RADIUS identity record after verifying the endpoint's true address. Which corrective approach most directly addresses the original issue?

  1. Inspect captive portal redirection, DNS reachability and HTTP/HTTPS interception policy.
  2. Use a supported authentication-order design that tries 802.1X and then permitted MAC authentication where appropriate.
  3. Correct the authorized MAC RADIUS identity record after verifying the endpoint's true address.
  4. Recognize the spoofing limitations of MAC identity and use stronger 802.1X when possible.

Explanation

Correct Answer

D:

This corrective choice addresses MAC spoofing limitation. The security design does not mistake a changeable hardware address for a cryptographic credential.

Incorrect Answers

A:

That alternative applies to Captive portal redirect failure instead. The portal can become reachable for an unauthenticated browser session.

B:

That alternative applies to 802.1X to MAC fallback instead. Legacy devices can follow a controlled alternative rather than bypassing all network admission checks.

C:

That alternative applies to MAC RADIUS entry mismatch instead. The switch's MAC-based request can match the expected authorized device record.

Question 584

An enterprise network designer recommends: Recognize the spoofing limitations of MAC identity and use stronger 802.1X when possible. Which situation most clearly calls for this action?

  1. An operator proposes treating MAC-only admission as equivalent to strong certificate-based user authentication.
  2. A guest client has limited DHCP access but never sees the required authentication web page.
  3. An Ethernet port serves a mix of domain computers and legacy devices that cannot respond to EAPOL.
  4. A non-802.1X endpoint is denied access because the registered MAC identifier differs from the address presented to RADIUS.

Explanation

Correct Answer

A:

This case requires the MAC spoofing limitation action. The security design does not mistake a changeable hardware address for a cryptographic credential.

Incorrect Answers

B:

This other case would be better matched to Inspect captive portal redirection, DNS reachability and HTTP/HTTPS interception policy. The portal can become reachable for an unauthenticated browser session.

C:

This other case would be better matched to Use a supported authentication-order design that tries 802.1X and then permitted MAC authentication where appropriate. Legacy devices can follow a controlled alternative rather than bypassing all network admission checks.

D:

This other case would be better matched to Correct the authorized MAC RADIUS identity record after verifying the endpoint's true address. The switch's MAC-based request can match the expected authorized device record.

Question 585

A visitor's device sends no 802.1X EAP responses, no MAC RADIUS path is configured, and policy allows only isolated internet access. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use the supported server-reject VLAN policy for failed responsive authentications.
  2. Choose an explicit deny action for the supported server-fail fallback behavior.
  3. Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported.
  4. Assign the nonresponsive eligible client to a restricted guest VLAN under the supported access policy.

Explanation

Correct Answer

D:

This action addresses Guest VLAN nonresponse. A non-supplicant can receive limited network service without full corporate access.

Incorrect Answers

A:

That action targets Rejected-user VLAN: Rejected credentials can cause restricted access distinct from silent guest VLAN behavior. It does not directly resolve the stated Guest VLAN nonresponse requirement.

B:

That action targets Server failure deny: A backend outage does not automatically grant sensitive network access. It does not directly resolve the stated Guest VLAN nonresponse requirement.

C:

That action targets RADIUS server unreachable: Authentication-server outages produce a defined access decision rather than unpredictable open access. It does not directly resolve the stated Guest VLAN nonresponse requirement.

Question 586

A Junos network engineer takes this step: Assign the nonresponsive eligible client to a restricted guest VLAN under the supported access policy. Which outcome most directly follows?

  1. A non-supplicant can receive limited network service without full corporate access.
  2. A backend outage does not automatically grant sensitive network access.
  3. Rejected credentials can cause restricted access distinct from silent guest VLAN behavior.
  4. Authentication-server outages produce a defined access decision rather than unpredictable open access.

Explanation

Correct Answer

A:

This is the direct result of the Guest VLAN nonresponse decision: A non-supplicant can receive limited network service without full corporate access.

Incorrect Answers

B:

This outcome is associated with Server failure deny (Choose an explicit deny action for the supported server-fail fallback behavior.), not the specified action.

C:

This outcome is associated with Rejected-user VLAN (Use the supported server-reject VLAN policy for failed responsive authentications.), not the specified action.

D:

This outcome is associated with RADIUS server unreachable (Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported.), not the specified action.

Question 587

A visitor's device sends no 802.1X EAP responses, no MAC RADIUS path is configured, and policy allows only isolated internet access. A colleague instead suggests: Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported. Which corrective approach most directly addresses the original issue?

  1. Use the supported server-reject VLAN policy for failed responsive authentications.
  2. Assign the nonresponsive eligible client to a restricted guest VLAN under the supported access policy.
  3. Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported.
  4. Choose an explicit deny action for the supported server-fail fallback behavior.

Explanation

Correct Answer

B:

This corrective choice addresses Guest VLAN nonresponse. A non-supplicant can receive limited network service without full corporate access.

Incorrect Answers

A:

That alternative applies to Rejected-user VLAN instead. Rejected credentials can cause restricted access distinct from silent guest VLAN behavior.

C:

That alternative applies to RADIUS server unreachable instead. Authentication-server outages produce a defined access decision rather than unpredictable open access.

D:

That alternative applies to Server failure deny instead. A backend outage does not automatically grant sensitive network access.

Question 588

An enterprise network designer recommends: Assign the nonresponsive eligible client to a restricted guest VLAN under the supported access policy. Which situation most clearly calls for this action?

  1. A high-security port must deny all new sessions whenever RADIUS authorization cannot be obtained.
  2. An otherwise valid access user loses authentication when the only RADIUS server becomes unreachable during an outage.
  3. A visitor's device sends no 802.1X EAP responses, no MAC RADIUS path is configured, and policy allows only isolated internet access.
  4. An EAP-capable user responds but supplies incorrect credentials and should be quarantined rather than treated as a guest.

Explanation

Correct Answer

C:

This case requires the Guest VLAN nonresponse action. A non-supplicant can receive limited network service without full corporate access.

Incorrect Answers

A:

This other case would be better matched to Choose an explicit deny action for the supported server-fail fallback behavior. A backend outage does not automatically grant sensitive network access.

B:

This other case would be better matched to Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported. Authentication-server outages produce a defined access decision rather than unpredictable open access.

D:

This other case would be better matched to Use the supported server-reject VLAN policy for failed responsive authentications. Rejected credentials can cause restricted access distinct from silent guest VLAN behavior.

Question 589

An otherwise valid access user loses authentication when the only RADIUS server becomes unreachable during an outage. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use the supported server-reject VLAN policy for failed responsive authentications.
  2. Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported.
  3. Choose an explicit deny action for the supported server-fail fallback behavior.
  4. Assign the nonresponsive eligible client to a restricted guest VLAN under the supported access policy.

Explanation

Correct Answer

B:

This action addresses RADIUS server unreachable. Authentication-server outages produce a defined access decision rather than unpredictable open access.

Incorrect Answers

A:

That action targets Rejected-user VLAN: Rejected credentials can cause restricted access distinct from silent guest VLAN behavior. It does not directly resolve the stated RADIUS server unreachable requirement.

C:

That action targets Server failure deny: A backend outage does not automatically grant sensitive network access. It does not directly resolve the stated RADIUS server unreachable requirement.

D:

That action targets Guest VLAN nonresponse: A non-supplicant can receive limited network service without full corporate access. It does not directly resolve the stated RADIUS server unreachable requirement.

Question 590

A Junos network engineer takes this step: Set a deliberate server-fail fallback policy such as a restricted server-fail VLAN where supported. Which outcome most directly follows?

  1. A backend outage does not automatically grant sensitive network access.
  2. A non-supplicant can receive limited network service without full corporate access.
  3. Authentication-server outages produce a defined access decision rather than unpredictable open access.
  4. Rejected credentials can cause restricted access distinct from silent guest VLAN behavior.

Explanation

Correct Answer

C:

This is the direct result of the RADIUS server unreachable decision: Authentication-server outages produce a defined access decision rather than unpredictable open access.

Incorrect Answers

A:

This outcome is associated with Server failure deny (Choose an explicit deny action for the supported server-fail fallback behavior.), not the specified action.

B:

This outcome is associated with Guest VLAN nonresponse (Assign the nonresponsive eligible client to a restricted guest VLAN under the supported access policy.), not the specified action.

D:

This outcome is associated with Rejected-user VLAN (Use the supported server-reject VLAN policy for failed responsive authentications.), not the specified action.

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