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[General] Real Juniper JN0-351 PDF Questions [2026]-The Greatest Shortcut Towards Success

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【General】 Real Juniper JN0-351 PDF Questions [2026]-The Greatest Shortcut Towards Success

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Juniper JN0-351 Exam Syllabus Topics:
TopicDetails
Topic 1
  • 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 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
  • BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 4
  • 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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q31-Q36):NEW QUESTION # 31
What is a purpose of using a spanning tree protocol?
  • A. to route IP packets
  • B. to look up MAC addresses
  • C. to tunnel Ethernet frames
  • D. to eliminate broadcast storms
Answer: D
Explanation:
A broadcast storm is a network condition where a large number of broadcast packets are sent and received by multiple devices, causing congestion and performance degradation. A broadcast storm can occur when there are loops in the network topology, meaning that there are multiple paths between two devices.
A spanning tree protocol is a network protocol that prevents loops from being formed when switches or bridges are interconnected via multiple paths. It does this by creating a logical tree structure that spans all the devices in the network, and disabling or blocking the links that are not part of the tree, leaving a single active path between any two devices.
By eliminating loops, a spanning tree protocol also eliminates broadcast storms, as broadcast packets will not be forwarded endlessly along the looped paths. Instead, broadcast packets will be sent only along the tree structure, reaching each device once and avoiding congestion.

NEW QUESTION # 32
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. generate route
  • B. static route using the resolve feature
  • C. static route using qualified next hops
  • D. aggregate route
Answer: A
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 # 33
Exhibit

You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?
  • A. The hold-time value must be two times the keepalive-time value
  • B. LLDP needs to be removed from the gr-1/1/10.1 interface.
  • C. The "event link-adjacency-loss" option must be set.
  • D. For GRE tunnels, the OAM protocol requires that the BFD protocols also be used.
Answer: A
Explanation:
Explanation
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down1.
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive-time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down2.
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel2. This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives3. Option B is incorrect, because the "event link-adjacency-loss" option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down4. Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels5.
References:
1: Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2: keepalive | Junos OS | Juniper Networks 3: Configuring Bidirectional Forwarding Detection 4: event link-adjacency-loss | Junos OS | Juniper Networks 5: Understanding Link Layer Discovery Protocol

NEW QUESTION # 34
Which statement is correct about controlling the routes installed by a RIB group?
  • A. A firewall filter must be configured to install routes in the RIB groups.
  • B. Only routes in the last table are installed.
  • C. An import policy is applied to the RIB group.
  • D. An export policy is applied to the RIB group.
Answer: C
Explanation:
Explanation
A RIB group is a configuration that allows a routing protocol to install routes into multiple routing tables in Junos OS. 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 or group. A RIB group can also include an import-policy statement, which specifies one or more policies to control which routes are imported into the destination routing table or group1.
An import policy is a policy statement that defines the criteria for accepting or rejecting routes from the source routing table. An import policy can also modify the attributes of the imported routes, such as preference, metric, or community. An import policy can be applied to a RIB group by using the import-policy statement under the [edit routing-options rib-groups] hierarchy level1.
Therefore, option A is correct, because an import policy is applied to the RIB group to control which routes are installed in the destination routing table or group. Option B is incorrect, because all routes in the source routing table are imported into the destination routing table or group, unless filtered by an import policy.
Option C is incorrect, because a firewall filter is not used to install routes in the RIB groups; a firewall filter is used to filter packets based on various criteria. Option D is incorrect, because an export policy is not applied to the RIB group; an export policy is applied to a routing protocol to control which routes are advertised to other devices.
References:
1: rib-groups | Junos OS | Juniper Networks

NEW QUESTION # 35
What are two reasons for creating multiple areas in OSPF? (Choose two.)
  • A. to increase the number of adjacencies in the backbone
  • B. to reduce LSA flooding across the network
  • C. to increase the size of the LSDB
  • D. to reduce the convergence time
Answer: B,D
Explanation:
Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time .
This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.
Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.

NEW QUESTION # 36
......
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