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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
Exam Duration:	90 minutes
Real Exam Qty:	65
Exam Price:	USD varies by region (typically around $200–$300 USD)
Passing Score:	~60-70%
Certificate Validity Period:	3 years
Available Languages:	English
Related Certifications:	JNCIP-ENT JNCIA-Junos JNCIE-ENT
Exam Format:	Multiple choice, Single-answer multiple choice, Multiple-answer multiple choice
Recommended Training:	Juniper Enterprise Routing & Switching Training Juniper Learning Portal
Exam Registration:	Juniper Certification Registration Pearson VUE Juniper Exams
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Pearson VUE proctored exam (online or test center)
Pre Condition:	JNCIA-Junos (JN0-105) recommended as prerequisite knowledge
Official Syllabus URL:	https://www.juniper.net/us/en/training/certification/certification-tracks/enterprise-routing-switching/jncis-ent.html

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Juniper JN0-351 Prüfungsplan:

Thema	Einzelheiten
Thema 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.
Thema 2	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.
Thema 3	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.
Thema 4	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Thema 5	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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Prüfungsfragen mit Lösungen (Q54-Q59):

54. Frage
You are asked to explore adding BGP route reflectors to allow for increased scale in your core network. Which statement is correct in this scenario?

A. The cluster ID is not required to use route reflectors.
B. The cluster ID is required to prevent routing loops.
C. Route reflectors require that the network is connected in a physical full mesh.
D. Route reflectors are required whenever internal BGP (IBGP) sessions are needed.

Antwort: B

55. Frage
Which statement is correct about the IS-IS ISO NET address?

A. An ISO NET address defined with a system ID of 0000.0000.0000 must be selected as the DIS.
B. You can only define a single ISO NET address per device.
C. An ISO NET address must be unique for each device in the network.
D. The Area ID must match on all devices within a L2 area.

Antwort: C

Begründung:
An ISO NET address is a type of network address used by the IS-IS routing protocol. It identifies a point of connection to the network, such as a router interface, and is also called a Network Service Access Point (NSAP)1.
An ISO NET address consists of three parts: an area ID, a system ID, and a selector2. The area ID identifies the IS-IS area to which the device belongs. The system ID uniquely identifies the device within the area. The selector identifies a specific service or function on the device, such as routing or management2.
An ISO NET address must be unique for each device in the network, because it is used by IS-IS to establish adjacencies, exchange routing information, and compute shortest paths2. If two devices have the same ISO NET address, they will not be able to communicate with each other or with other devices in the network. Therefore, it is important to assign different ISO NET addresses to each device in the network.

56. Frage
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

A. designated
B. disabled
C. alternate
D. backup
E. root

Antwort: B,C,D

Begründung:
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree 1 2 3 . The roles include root, designated, alternate, backup, and disabled 1 2 3 .
The discarding state is associated with the backup, alternate, and disabled roles 1 2 3 . In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state 2 . Disabled ports are also in the discarding state 3 .
Therefore, options B, C, and D are correct.

57. Frage
Exhibit

You are receiving the BGP route shown in the exhibit from four different upstream ISPs.
Referring to the exhibit, which ISP will be selected as the active path?

A. ISP 2
B. ISP 4
C. ISP 3
D. ISP1

Antwort: B

Begründung:
Explanation
In BGP, the path selection process is based on a set of attributes1. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on1. If all these attributes are the same, then it prefers the path with the shortest AS path1.
Referring to the exhibit, all four ISPs have the same weight, local preference, and origin1. However, ISP 4 has the shortest AS path1. Therefore, ISP 4 will be selected as the active path. So, option C is correct.

58. Frage
Which statement is correct about the storm control feature?

A. The storm control feature requires a special license on EX Series switches.
B. The storm control configuration only applies to traffic being sent between the forwarding and control plane.
C. The storm control feature is enabled in the factory-default configuration on EX Series switches.
D. The storm control feature is not supported on aggregate Ethernet interfaces.

Antwort: C

Begründung:
The storm control feature is enabled in the factory-default configuration on EX Series switches.
On EX2200, EX3200, EX3300, EX4200, and EX6200 switches, the factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces. On EX4300 switches, the factory default configuration enables storm control on all Layer 2 switch interfaces.

59. Frage
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