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Juniper JN0-351 Prüfungsplan:

Thema	Einzelheiten
Thema 1	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.
Thema 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.
Thema 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.
Thema 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.
Thema 5	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Thema 6	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.
Thema 7	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 8	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Prüfungsfragen mit Lösungen (Q149-Q154):

149. Frage
Exhibit.

Why is this OSPF adjacency remaining in this state?

A. An MTU mismatch exists between the OSPF neighbors.
B. An area ID mismatch exists between the OSPF neighbors
C. A hello interval mismatch exists between the OSPF neighbors.
D. A subnet mask mismatch exists between the OSPF neighbors.

Antwort: A

Begründung:
The exhibit shows the output of the command , which displays information about the OSPF neighbors on a router1.
The output shows that the OSPF neighbor with the address 172.26.1.1 and the interface ge-0/0/3.0 is in the Exstart state1.
The Exstart state is the fourth state in the OSPF neighbor formation process, after Down, Init, and
2-Way states2. In this state, the OSPF neighbors establish a master-slave relationship and exchange database description (DBD) packets, which contain summaries of their link-state databases2.
The most common reason for OSPF neighbors to be stuck in the Exstart state is an MTU mismatch between the interfaces3. MTU stands for maximum transmission unit, which is the largest size of a packet that can be transmitted on a network segment4. If the MTU values of two OSPF neighbors are different, theymay not be able to exchange DBD packets successfully, as some packets may be dropped or fragmented due to their size exceeding the MTU limit3.
To solve this problem, you need to ensure that the MTU values of both OSPF neighbors are the same or compatible. You can use the command show interfaces to display the MTU value of an interface5. You can also use the command ping with the do-not-fragment option to test the MTU size between two routers. You can change the MTU value of an interface by using the command set interfaces interface-name mtu mtu-value in configuration mode5.

150. Frage
Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)

A. On R1, enable Level 1 on the ge-0/0/1 interface.
B. On R3 disable Level 2 on the ge-0/0/4 interface.
C. On R1, disable Level 2 on the ge-0/0/1 interface.
D. On R3 enable Level 1 on the ge-0/0/4 interface

Antwort: A,D

Begründung:
A) On R1, enable Level 1 on the ge-0/0/1 interface. In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1. Level 1 systems route within an area.
If the destination is outside an area, Level 1 systems route toward a Level 2 system. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.
D) On R3 enable Level 1 on the ge-0/0/4 interface Similarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3. These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1 and Cisco.

151. Frage
What are two purposes of an aggregate route? (Choose two.)

A. to hide internal routes from external peers
B. to decrease the number of route advertisements
C. to increase the number of route advertisements
D. to allow external peers to see internal routes

Antwort: A,B

Begründung:
An aggregate route is a route that summarizes multiple more specific routes into a single route advertisement.
For example, an aggregate route to 10.0.0.0/8 can represent many routes to 10.x.x.x/24 subnets. An aggregate route has several purposes, such as:
To decrease the number of route advertisements: By consolidating multiple routes into one, an aggregate route reduces the size of the routing table and the amount of routing updates that need to be exchanged between routers. This can improve the scalability and efficiency of the network12.
To hide internal routes from external peers: By advertising only the aggregate route and not the more specific routes, an aggregate route can provide a level of abstraction and security for the internal network topology. This can prevent external peers from knowing the details of the internal routes and avoid potential attacks or misconfigurations13.
The other options are not correct because:
C). To allow external peers to see internal routes: This is the opposite of what an aggregate route does. An aggregate route hides the internal routes from external peers, not exposes them13.
D). To increase the number of route advertisements: This is also the opposite of what an aggregate route does. An aggregate route decreases the number of route advertisements, not increases them12.
References: Configuring Route Aggregation | Junos OS, JunOS Aggregate and Generate Routes - Network Direction, Aggregate Routes vs Generated Routes. | Junos OS - Juniper Networks

152. Frage
Referring to the exhibit, the local router should have an IS-IS adjacency with a neighboring router, but the adjacency never establishes correctly.

What should you do to solve the problem?

A. Disable level 2 for the interfaces.
B. Change the local IS-IS area ID to 49.0002.
C. Disable level 1 for the interfaces.
D. Disable wide metrics.

Antwort: B

153. Frage
Which statement correctly describes the purpose of a routing policy's "then" clause in Junos OS?

A. It applies only to OSPF external routes.
B. It defines the match conditions for the policy.
C. It defines the actions taken when a route matches the specified conditions, such as accept, reject, or attribute modification.
D. It is only used for firewall filters, not routing policies.

Antwort: C

Begründung:
In a Junos OS routing policy, the "then" clause specifies the action to take when a route matches the conditions defined in the "from" clause. Actions can include accepting or rejecting the route, or modifying route attributes such as metric, preference, or community values before the route is accepted or rejected.

154. Frage
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