What is the purpose of MAC Authentication Bypass (MAB) in an 802.1X deployment?

To encrypt traffic using MAC addresses

To bypass authentication for all devices on a port

To provide a secure tunnel for MAC addresses

To authenticate devices that do not support 802.1X by using their MAC address

When does MAB typically trigger in the authentication flow?

Only when the RADIUS server is unreachable

Only when the port is configured with a guest VLAN

After the 802.1X authentication times out or fails

What is the purpose of a guest VLAN in an 802.1X deployment?

To bypass authentication for trusted devices

To provide full network access to authenticated users

To isolate all traffic on a port

To provide limited network access to unauthenticated devices

What is the purpose of periodic reauthentication in 802.1X?

To refresh the client's IP address

To update the switch's MAC address table

To ensure the client is still authorized to access the network

To encrypt the data traffic on the port

A network administrator is troubleshooting an 802.1X deployment where users are able to authenticate but are not receiving the correct VLAN assignment. The RADIUS server is configured to return a Tunnel-Private-Group-ID attribute. What is the most likely reason the VLAN is not being applied?

The VLAN is not defined on the switch.

The supplicant is not sending the correct identity.

The RADIUS server is sending the attribute in the wrong format.

The switch is not configured to accept RADIUS-supplied VLAN assignment.

Juniper NetworksCertified Professional, Enterprise Routing and Switching (JNCIP-ENT)

Domain 5Objective 2

802.1x Concepts and Functionality JN0-650 Practice Questions (Page 1)

Part of the Layer 2 Authentication and Access Control domain, which makes up ~19% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~7–11 in this domain), expect 1–2 from this objective — we provide 28 practice questions to prepare you well beyond it. (estimate)

28questions here

6free pages

8concepts

Questions 1–5

1foundation · easy
What is the purpose of MAC Authentication Bypass (MAB) in an 802.1X deployment?
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2foundation · easy
When does MAB typically trigger in the authentication flow?
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3foundation · easy
What is the purpose of a guest VLAN in an 802.1X deployment?
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4foundation · easy
What is the purpose of periodic reauthentication in 802.1X?
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5expert · medium
A network administrator is troubleshooting an 802.1X deployment where users are able to authenticate but are not receiving the correct VLAN assignment. The RADIUS server is configured to return a Tunnel-Private-Group-ID attribute. What is the most likely reason the VLAN is not being applied?
Select an answer first

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