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Juniper JN0-351 Exam Overview:

Certification Vendor:	Juniper Networks
Exam Name:	Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Exam Number:	JN0-351
Real Exam Qty:	65
Certificate Validity Period:	3 years
Related Certifications:	JNCIS-ENT
Exam Price:	$300 USD
Available Languages:	English
Exam Duration:	90 minutes
Passing Score:	Not specified (Pass/Fail status available immediately)
Exam Format:	Multiple-choice questions
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Pearson VUE testing centers (In-person)
Pre Condition:	Recommended: 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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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	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 3	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 4	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 5	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 6	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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q180-Q185):

NEW QUESTION # 180
You are deploying a trunk port with multiple VLANs. In this scenario, which statement is true about the native VLAN?

A. The native VLAN must be the default VLAN on the port.
B. The native VLAN is an untagged VLAN ID on the port.
C. The native VLAN is automatically configured through DHCP.
D. The native VLAN is the highest tagged VLAN ID on the port.

Answer: B

NEW QUESTION # 181
Which two statements are correct about Q-in-Q tunneling on Juniper EX Series switches?
(Choose two.)

A. Q-in-Q adds an additional 802.1Q VLAN tag to already-tagged customer traffic.
B. Q-in-Q can only be used with untagged traffic.
C. Q-in-Q removes the customer VLAN tag entirely before forwarding.
D. Q-in-Q is used to extend Layer 2 VLANs transparently across a service provider network.

Answer: A,D

Explanation:
Q-in-Q (IEEE 802.1ad-style tunneling) works by adding a second, outer 802.1Q VLAN tag to already VLAN-tagged customer traffic, allowing a service provider to transparently transport multiple customer VLANs across their network using a single outer VLAN tag per customer, without needing visibility into or interference with the customer's inner VLAN tags.

NEW QUESTION # 182
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)

A. Dynamic ARP inspection is enabled on the interface.
B. MAC limiting is enabled on the interface.
C. The device that is connected to the interface has performed a DHCPRELEASE.
D. The device that is connected to the interface has a static IP address.

Answer: B,D

Explanation:
The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information 1
. This database is used to filter and validate DHCP messages from untrusted sources 1 .
However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:
* MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping. MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks 1 . This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.
* Static IP address : If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database
1 . The DHCP snooping feature relies on monitoring DHCP messages to build its database 1 , so devices with static IP addresses that do not send DHCP messages will not have their information added.
Therefore, options B and C are correct. Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database 1 , and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created 1 .

NEW QUESTION # 183
Which two statements are true about an EX2300 device? (Choose two.)

A. By default, all switch ports are trunk ports.
B. By default, all switch ports are associated with the default VLAN.
C. By default, all switch ports are access ports.
D. By default, trunk ports can carry untagged traffic.

Answer: B,C

NEW QUESTION # 184
You are asked to create a default route that will be advertised to your internal OSPF neighbors.
You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available. Which solution should you implement in this scenario?

A. Create a default static route with each neighbor address as the next hop.
B. Create a default static route with ISP1's address as the next hop while specifying the addresses for ISP2 and ISP3 as qualified next hops with a preference value of six or higher.
C. Create a default aggregated route.
D. Create a default generate route that includes an import policy to match BGP routes from ISP1 and assign a preference value of four or less.

Answer: B

NEW QUESTION # 185
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