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Juniper JN0-351 Exam Syllabus Topics:

TopicDetails
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
  • 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 3
  • 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 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
  • 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 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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q190-Q195):

NEW QUESTION # 190
You want to ensure traffic is routed through a GRE tunnel.
In this scenario, which two statements will satisfy this requirement? (Choose two.)

Answer: C,D

Explanation:
Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.
Option B is correct. All intermediary devices must have a route to the tunnel endpoints34. In real-world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.


NEW QUESTION # 191
Exhibit.

Why is this OSPF adjacency remaining in this state?

Answer: D

Explanation:
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.


NEW QUESTION # 192
Which statement is correct about GRE tunnels?

Answer: C


NEW QUESTION # 193
Which two statements are correct about Martian routes? {Choose two.)

Answer: B,D


NEW QUESTION # 194
Which two multicast IP addresses are used for link-state update packets? (Choose two.)

Answer: A,B

Explanation:
Link-state update packets are used to flood link-state advertisements (LSAs) among OSPF routers. The destination IP address of these packets depends on the network type and the state of the interface. On broadcast and point-to-point networks, OSPF uses two IP multicast addresses: 224.0.0.5 for all OSPF routers and 224.0.0.6 for all designated routers (DRs) and backup designated routers (BDRs)12. If the interface state is DR or BDR, the link-state update packets are sent to 224.0.0.5. Otherwise, they are sent to 224.0.0.63. On non-broadcast networks, such as Frame Relay or ATM, link-state update packets are sent as unicasts to each adjacent neighbor3. Therefore, the correct answer is A and D. References: Understanding OSPF Areas | Junos OS, How OSPF Works - IP Routing [Book] - O'Reilly Media, Link state packet - Wikipedia


NEW QUESTION # 195
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