Reliable JN0-351 Practice Questions | JN0-351 Exam Questions And Answers

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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
Passing Score:	Not publicly disclosed (approx. 65%-70%)
Exam Duration:	90 minutes
Related Certifications:	JNCIP-ENT JNCIE-ENT JNCIA-Junos
Exam Price:	$200 USD
Real Exam Qty:	65
Certificate Validity Period:	3 years
Exam Format:	Multiple Choice
Available Languages:	English
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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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	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.
Topic 3	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q185-Q190):

NEW QUESTION # 185
Which two statements are correct about the Junos OS "show configuration | compare rollback 1" command? (Choose two.)

A. It immediately applies the rollback configuration without requiring a commit.
B. It displays the differences between the current candidate configuration and a previously committed configuration.
C. Lines prefixed with a plus (+) indicate additions, while lines prefixed with a minus (-) indicate deletions.
D. It can only compare against the active configuration, not the candidate configuration.

Answer: B,C

Explanation:
The "show configuration | compare rollback 1" command displays a diff-style comparison between the current candidate configuration and a specified previous configuration (rollback 1 being the most recent prior committed configuration). In the output, lines prefixed with a plus sign (+) represent additions in the candidate configuration, while lines prefixed with a minus sign (-) represent deletions compared to the rollback version, helping administrators review changes before committing.

NEW QUESTION # 186
Exhibit.

You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

A. The routes displayed are being learned from an I BGP peer.
B. The routes displayed have traversed one or more autonomous systems.
C. The output shows routes that were received prior to the application of any BGP import policies.
D. The output shows routes that are active and rejected by an import policy.

Answer: A,B

Explanation:
A). The routes displayed have traversed one or more autonomous systems. True. The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route ' s traversal through various autonomous systems. D.
The routes displayed are being learned from an IBGP peer. True. The absence of the ' * > i ' marker before the prefixes indicates they are being learned from an IBGP peer. Therefore, the correct statements are A. The routes displayed have traversed one or more autonomous systems. and D. The routes displayed are being learned from an IBGP peer.

NEW QUESTION # 187
What are two characteristics of RSTP alternate ports? (Choose two.)

A. RSTP alternate ports are active ports used to forward frames toward the root bridge.
B. RSTP alternate ports provide an alternate lower cost path to the root bridge.
C. RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
D. RSTP alternate ports provide an alternate higher cost path to the root bridge.

Answer: C,D

Explanation:
A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port1. However, an alternate port does not forward any traffic, as it is in a discarding state2. It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port1.
C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID3. However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself1. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.

NEW QUESTION # 188
You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.
Referring to the exhibit, which two statements are correct? (Choose two.)

A. Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.
B. Create static routes on the switches using the local vMX router's loopback interface for the next hop.
C. Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.
D. Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type
5 LSAs.

Answer: A,C

Explanation:
The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets. This can be resolved by redistributing the connected subnets into OSPF.
Option C suggests to configure and apply a routing policy that redistributes the connected Dallas and Denver subnets. This is correct because redistribution allows routes from one routing protocol to be communicated to another, and in this case, it allows the connected subnets to be advertised through OSPF.
Option D suggests enabling the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets. This is also correct because in OSPF, a passive interface is an interface that belongs to the OSPF router, but does not send OSPF Hello packets. It's typically used on an interface that you don't want to use for OSPF adjacencies, but you still want to advertise its IP address. Therefore, enabling passive interface can help in advertising the Dallas and Denver subnets.

NEW QUESTION # 189
Which two statements are correct about Q-in-Q tunneling on Juniper EX Series switches?
(Choose two.)

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

Answer: A,C

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 # 190
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