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Juniper JN0-351 Prüfungsplan:

ThemaEinzelheiten
Thema 1
  • Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Thema 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.
Thema 3
  • 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 4
  • 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 5
  • 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 6
  • 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 7
  • 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 8
  • BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Prüfungsfragen mit Lösungen (Q85-Q90):

85. Frage
Which statement is true about Layer 2 firewall filters on EX Series switches?

Antwort: B


86. Frage
Exhibit

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

Antwort: A,D

Begründung:
Explanation
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 area2. If the destination is outside an area, Level 1 systems route toward a Level 2 system2. 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 Cisco34.


87. Frage
You are deploying an EX Series switch with a Wi-Fi access point. The access point needs all untagged traffic to use a specific VLAN.
In this scenario, which feature should you enable on the switch port?

Antwort: B

Begründung:
According to the Juniper documentation1, a native VLAN is a VLAN that carries untagged traffic on a trunk port. A Wi-Fi access point may need a native VLAN to associate untagged traffic with a specific VLAN, such as the management VLAN. On Juniper EX Series switches, you can enable a native VLAN on a switch port by setting the interface-mode to trunk and specifying a native-vlan-id. For example, the following configuration enables a native VLAN with ID 1 on the switch port ge-0/0/12:
set interfaces ge-0/0/1 unit 0 family ethernet-switching interface-mode trunk set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members all set interfaces ge-0/0/1 unit 0 family ethernet-switching native-vlan-id 1 The other options are not correct because they do not address the requirement of untagged traffic. VLAN tagging is the process of adding a VLAN identifier to a frame, which is not needed for untagged traffic.
Flexible VLAN tagging is a feature that allows multiple VLAN tags on a single interface, which is not relevant for this scenario. Voice VLAN is a feature that allows voice traffic to be separated from data traffic on a switch port, which is not related to untagged traffic or Wi-Fi access points. References: Understanding Native VLANs on Trunks | Junos OS, Configuring a Native VLAN on a Trunk Port | Junos OS


88. Frage
Exhibit.

You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?

Antwort: D

Begründung:
* The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp
. This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP 1 . This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence 2 .
* The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches 3 . Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning: STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor 1 .
* To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode 1 .


89. Frage
The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?

Antwort: C

Begründung:
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table.
This means that the routes from inet.0 will be imported into ispi.inet.0.


90. Frage
......

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