JN0-351 Questions Answers | JN0-351 Exam Review

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Before starting the Juniper JN0-351 preparation, plan the amount of time you will allot to each topic, determine the topics that demand more effort and prioritize the components that possess more weightage in the Juniper JN0-351 Exam. This kind of polished approach is beneficial for a commendable grade in the Juniper JN0-351 Exam.

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	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 3	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 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.

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JN0-351 Exam Review | New JN0-351 Study Notes

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q39-Q44):

NEW QUESTION # 39
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)

A. You can deploy both stateless and stateful firewall filters on an EX Series switch.
B. You can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.
C. You can only apply firewall filters to Layer 2 traffic on an EX Series switch.
D. You can deploy only stateless firewall filters on an EX Series switch.

Answer: B,D

Explanation:
A is correct because you can deploy only stateless firewall filters on an EX Series switch. A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers1. A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or sessioninformation1. EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters2.
C is correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch. Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks3. EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters4. You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.

NEW QUESTION # 40
Referring to the exhibit, why is the route for 10.5.5.5 hidden?

A. It is a martian route.
B. The next hop cannot be resolved.
C. It is an L3VPN route.
D. It has an invalid community.

Answer: B

NEW QUESTION # 41
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

A. static route using qualified next hops
B. aggregate route
C. static route using the resolve feature
D. generate route

Answer: D

Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
One key difference:
With aggregated routes any prefix in the routing table counts as a contributing route.
With generated routes only prefix with a valid next-hop qualifies.

NEW QUESTION # 42
Which two statements are correct about Rapid Spanning Tree Protocol (RSTP)? (Choose two.)

A. RSTP cannot interoperate with legacy 802.1D STP switches.
B. RSTP uses the same port states as 802.1D STP without modification.
C. RSTP provides faster convergence than traditional 802.1D STP.
D. RSTP introduces new port roles such as alternate and backup ports.

Answer: C,D

Explanation:
Rapid Spanning Tree Protocol (RSTP), defined in IEEE 802.1w, significantly improves convergence time over traditional 802.1D STP by introducing new port roles, including alternate ports (providing an alternate path to the root) and backup ports (providing a backup path to a segment). RSTP is also backward compatible and can interoperate with legacy 802.1D STP switches.

NEW QUESTION # 43
What are two characteristics of RSTP alternate ports? (Choose two.)

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

Answer: A,B

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 port. However, an alternate port does not forward any traffic, as it is in a discarding state. 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 port.
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 ID.
However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.

NEW QUESTION # 44
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