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Our PDF version is a printable document of exam questions which are real and updated. We have included original Enterprise Routing and Switching, Specialist (JNCIS-ENT) questions in this format so that can you get ready for the exam quickly by just memorizing them. This format of Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) test questions is also usable on smart devices such as laptops, tablets, and smartphones.

Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 2	Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
Topic 3	High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Topic 4	Layer 2 Switching or VLANs: This topic deepens the understanding of Layer 2 switching operations within the Junos OS, including VLAN concepts and benefits. Experienced networking professionals gain insights into configuration, monitoring, and troubleshooting techniques essential for network segmentation and efficiency.
Topic 5	Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.
Topic 6	IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.
Topic 7	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Topic 8	Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 Exam.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q189-Q194):

NEW QUESTION # 189
Which two statements are correct about OSPF area types? (Choose two.)

A. A stub area does not allow external routes to be flooded into it.
B. A not-so-stubby area (NSSA) allows external routes to be imported and translated into the backbone.
C. A totally stubby area allows external routes but blocks summary LSAs.
D. The backbone area (area 0) must be a stub area.

Answer: A,B

Explanation:
A stub area blocks Type 5 external LSAs from being flooded into it, relying instead on a default route to reach external destinations. A not-so-stubby area (NSSA) is a variation that allows external routes to be imported locally as Type 7 LSAs, which the Area Border Router (ABR) then translates into Type 5 LSAs for propagation into the backbone.

NEW QUESTION # 190
Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device.
Which BGP attribute would you use?

A. local preference
B. origin
C. next-hop
D. MED

Answer: A

Explanation:
The BGP attribute that you would use to forward all Internet traffic through the R1 device is the local preference.
The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers. It is used to select an exit point from the AS. The path with the highest local preference is preferred. By setting a higher local preference for the routes received from R1, you can make R1 the preferred exit point for all Internet traffic.

NEW QUESTION # 191
You have configured OSPF routing as shown in the exhibit. You notice that all interfaces have formed full adjacencies, with the exception of the interfaces connecting R3 and R4 with a status of 2Way.

What is the reason for this status?

A. The interface-type is not configured as p2p.
B. The two routers must be configured in different areas.
C. DROther routers will not form a full adjacency with each other.
D. The two routers must both be configured as DR routers.

Answer: C

NEW QUESTION # 192
Which statement correctly describes the purpose of BPDU protection in Junos OS?

A. It prevents the local switch from processing configuration changes.
B. It disables a port that receives a BPDU when the port is configured as an edge port, preventing unauthorized switches from participating in the spanning tree.
C. It replaces the need for root protection.
D. It is used only on trunk ports carrying multiple VLANs.

Answer: B

Explanation:
BPDU protection is applied to edge ports (ports expected to connect only to end hosts) to guard against unauthorized or rogue switches being connected. If a BPDU is received on a protected edge port, the port is automatically disabled, preventing potential spanning tree topology changes caused by unauthorized devices.

NEW QUESTION # 193
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)

A. You should apply the firewall filter to the appropriate IRB interface.
B. You should create a family Ethernet-switching firewall filter with the appropriate match criteria and actions.
C. You should apply the firewall filter to the appropriate VLAN.
D. You should create a family inet firewall filter with the appropriate match criteria and actions.

Answer: A,D

Explanation:
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device 1 .
A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet-switching 2 . The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term 3 .
To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer 3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks 4 .
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface.
Option A is incorrect, because you should not create a family ethernet-switching firewall filter with the appropriate match criteria and actions. A family ethernet-switching firewall filter is used to evaluate Layer 2 traffic on a Juniper device. A family ethernet-switching firewall filter can only match on MAC addresses or VLAN IDs, not on IP addresses or protocols 5 .
Option B is incorrect, because you should not apply the firewall filter to the appropriate VLAN. A VLAN is a logical grouping of hosts that share the same broadcast domain on a Layer 2 network. A VLAN does not have an IP address or routing capability. A firewall filter cannot be applied directly to a VLAN; it must be applied to an interface that belongs to or connects to the VLAN 6 .
References:
1 : Firewall Filters Overview 2 : Configuring Firewall Filters 3 : Configuring Firewall Filter Match Conditions and Actions 4 : Understanding Integrated Routing and Bridging Interfaces 5 : Configuring Ethernet-Switching Firewall Filters 6 : Understanding VLANs
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/task/firewall-filter-qfx- series-cli.html

NEW QUESTION # 194
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