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Juniper JN0-351 Exam Overview:

Certification Vendor:	Juniper Networks
Exam Name:	Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam
Exam Number:	JN0-351
Real Exam Qty:	65
Exam Duration:	90 minutes
Available Languages:	English
Passing Score:	Not publicly disclosed (approx. 65%-70%)
Related Certifications:	JNCIE-ENT JNCIA-Junos JNCIP-ENT
Certificate Validity Period:	3 years
Exam Format:	Multiple Choice
Exam Price:	$200 USD
Recommended Training:	Juniper Learning Portal
Exam Registration:	Pearson VUE Registration
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Online proctored or onsite testing center (Pearson VUE)
Pre Condition:	Valid JNCIA-Junos certification
Official Syllabus URL:	https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html

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JN0-351 Training Questions | JN0-351 Training Pdf

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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	OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
Topic 3	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 4	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 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	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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q136-Q141):

NEW QUESTION # 136
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

A. static route using qualified next hops
B. generate route
C. static route using the resolve feature
D. aggregate route

Answer: D

Explanation:
Explanation
In this scenario, you should create an 1. Aggregate routes are used for advertising summarized network prefixes1. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.
Therefore, option A is correct. Options B, C, and D are not correct because:
Static route using the resolve feature: This type of route uses the resolve feature to install a static route in the routing table only if a specific condition is met1. However, it does not provide the capability to summarize multiple routes into a single prefix.
Generate route: This type of route generates a route that is always present in the routing table and can be used to summarize routes. However, it does not have the capability to only advertise the route when specific BGP routes are being received from a neighbor1.
Static route using qualified next hops: This type of route allows for the specification of multiple next-hop addresses for a static route1. However, it does not provide the capability to summarize multiple routes into a single prefix.

NEW QUESTION # 137
Referring to the exhibit, which statement is correct?

A. The root bridge has not been elected for this RSTP topology.
B. The local device is the root bridge for this RSTP topology.
C. The root bridge is using a bridge priority of 4k.
D. The local device is using a bridge priority of 4k.

Answer: C

Explanation:
The "Root ID" shows 4096.00:19:e2:55:36:1e. The first part of this ID, 4096, is the bridge priority of the root bridge.
The local bridge ID is shown as 32768.00:19:e2:55:1d:30, indicating that the local device has a default bridge priority of 32768, which is higher (and thus less preferred) than 4096.
Thus, the root bridge has a priority of 4096, and the local device is not the root bridge. The local device is participating in the RSTP topology and has identified another bridge as the root.

NEW QUESTION # 138
Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?

A. The switch will shut down the offending port for five minutes.
B. The switch will shut down MAC learning on the offending port for five minutes.
C. The switch stops learning MAC addresses on the offending port, and any traffic to or from the offending MAC address will be dropped.
D. The switch stops learning MAC addresses on the offending port, but floods traffic out of all ports for the offending MAC address.

Answer: C

Explanation:
According to the Juniper documentation 1 , MAC limiting is a feature that enhances port security by limiting the number of MAC addresses that can be learned within a VLAN. When the MAC limit is exceeded, the switch can perform different actions, such as ignoring, dropping, logging, shutting down, or disabling the offending port. The default action is to drop the packets with new MAC addresses and log a message 2 .
Therefore, the correct answer is B.
The other options are not correct because:
* A. The switch will not shut down the offending port for five minutes by default. This is a configurable action, but not the default one 2 .
* C. The switch will not flood traffic out of all ports for the offending MAC address by default. This is a possible consequence of ignoring the packets with new MAC addresses, but not the default action 2 .
* D. The switch will not shut down MAC learning on the offending port for five minutes by default. This is another configurable action, but not the default one 2 .
References: Understanding MAC Limiting and MAC Move Limiting | Junos OS , Configuring MAC Limiting | Junos OS

NEW QUESTION # 139
Which statement is correct about IP-IP tunnels?

A. IP-IP tunnels only support encapsulating non-IP traffic.
B. There are 24 bytes of overhead with IP-IP encapsulation.
C. IP-IP tunnels only support encapsulating IP traffic.
D. The TTL in the inner packet is decremented during transit to the tunnel endpoint.

Answer: D

Explanation:
IP-IP tunnels encapsulate IP packets within other IP packets, allowing them to traverse networks that wouldn ' t normally support the original IP packets. This encapsulation involves the TTL (Time-to-Live) of the inner packet being decremented as it traverses through the tunnel towards its endpoint.

NEW QUESTION # 140
You deployed a new EX Series switch with DHCP snooping enabled and you do not see any entries in the snooping databases for an interface. Which two Juniper configurations for that interface caused this issue? (Choose two.)

A. The interface is configured as a trunk port.
B. MAC limiting is enabled on the interface.
C. Dynamic ARP inspection is enabled on the interface.
D. The interface is configured as a disabled port.

Answer: A,D

Explanation:
A is correct because the interface is configured as a disabled port. A disabled port does not forward any traffic, including DHCP packets. Therefore, DHCP snooping cannot learn any MAC addresses or lease information from a disabled port.
C is correct because the interface is configured as a trunk port. By default, all trunk ports on the switch are trusted for DHCP snooping. This means that DHCP snooping does not inspect or filter any DHCP packets received on a trunk port. Therefore, DHCP snooping does not add any entries to the snooping database for a trunk port.

NEW QUESTION # 141
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