Enterprise Routing and Switching, Professional (JNCIP-ENT)

Here you have the best Juniper JN0-648 practice exam questions

  • You have 65 total questions across 13 pages (5 per page)
  • These questions were last updated on February 18, 2026
  • This site is not affiliated with or endorsed by Juniper.
Question 1 of 65
Which BGP message type contains NLRI information?
Answer

Suggested Answer

The suggested answer is C.

BGP (Border Gateway Protocol) uses the update message type to carry Network Layer Reachability Information (NLRI). This information includes data about the network addresses that the router can reach and the associated path attributes.

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Question 2 of 65
Click the Exhibit button.
Exam JN0-648: Question 2 - Image 1
Referring to the exhibit, which two statements are true regarding Q-in-Q tunneling? (Choose two.)
Answer

Suggested Answer

The suggested answer is B, D.

Q-in-Q tunneling, or VLAN stacking, allows multiple VLANs to be encapsulated within an outer VLAN tag to pass through a provider network. From the exhibit, the customer port (ge-0/0/1) shows that VLAN IDs 100-200 are to be processed with encapsulation extended-vlan-bridge, allowing these VLANs to be mapped and tagged appropriately. The VLAN map push and pop commands indicate that the inner VLAN tags (customer VLANs) will be encapsulated inside an outer VLAN tag when passing through the network. The uplink port (xe-0/0/48) uses VLAN ID 10, which will serve as the outer VLAN tag. Therefore, the correct statements are: C-VLANs 100-200 will be sent as the inner VLAN tag and the C-VLAN traffic will be encapsulated with an outer VLAN tag of 10.

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Question 3 of 65
What is the correct authentication processing order on EX Series switches when multiple Layer 2 authentication methods are enabled?
Answer

Suggested Answer

The suggested answer is B.

On EX Series switches, the correct authentication processing order when multiple Layer 2 authentication methods are enabled is 802.1X first, followed by MAC RADIUS, and finally captive portal. The process starts with 802.1X authentication, which provides the highest security. If 802.1X fails or times out, the switch then attempts MAC RADIUS authentication. If both 802.1X and MAC RADIUS authentication methods are not successful, the captive portal is used as the final method.

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Question 4 of 65
You are implementing a single spanning tree instance in your network and want to use the protocol that will give you the best convergence time in the event of a physical network failure of the root bridge.
Which spanning tree protocol will satisfy this requirement?
Answer

Suggested Answer

The suggested answer is A.

Rapid Spanning Tree Protocol (RSTP) is designed to provide faster convergence compared to the original Spanning Tree Protocol (STP) in the event of a topology change such as the failure of the root bridge. RSTP achieves this by introducing new port roles and states, allowing for quicker reconfiguration. Given the requirement of the best convergence time in case of a physical network failure, RSTP is the most suitable protocol.

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Question 5 of 65
What are three well-known mandatory BGP attributes? (Choose three.)
Answer

Suggested Answer

The suggested answer is B, C, D.

The three well-known mandatory BGP attributes are AS-path, origin, and next-hop. These attributes must be included in every BGP update message. AS-path is a list of Autonomous Systems that routing information has traversed, origin indicates the origin of the path information, and next-hop provides the next hop IP address to reach a network. MED and community are not mandatory attributes; MED is optional non-transitive, and community is optional transitive.

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About the Juniper JN0-648 Certification Exam

About the Exam

The Juniper JN0-648 (Enterprise Routing and Switching, Professional (JNCIP-ENT)) validates your knowledge and skills. Passing demonstrates proficiency and can boost your career prospects in the field.

How to Prepare

Work through all 65 practice questions across 13 pages. Focus on understanding the reasoning behind each answer rather than memorizing responses to be ready for any variation on the real exam.

Why Practice Exams?

Practice exams help you familiarize yourself with the question format, manage your time, and reduce anxiety on the test day. Our JN0-648 questions are regularly updated to reflect the latest exam objectives.