Exam JN0-351 Question & Latest JN0-351 Dumps

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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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.
Topic 2	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.
Topic 3	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.
Topic 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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q183-Q188):

NEW QUESTION # 183
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 " event link-adjacency-loss " option must be set.
B. LLDP needs to be removed from the gr-1/1/10.1 interface.
C. The hold-time value must be two times the keepalive-time value
D. For GRE tunnels, the OAM protocol requires that the BFD protocols also be used.

Answer: C

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 down 1 .
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 down 2 .
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel 2 . 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 keepalives 3 . 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 down 4 . 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 tunnels 5 .
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 # 184
Which two statements are correct about generated routes? (Choose two.)

A. Generated routes require a contributing route.
B. Generated routes show a next hop in the routing table.
C. Generated routes cannot be redistributed into dynamic routing protocols.
D. Generated routes appear in the routing table as static routes

Answer: A,B

Explanation:
A is correct because generated routes require a contributing route. A contributing route is a route that matches the destination prefix of the generated route and has a valid next hop1. A generated route is only installed in the routing table if there is at least one contributing route available2. This ensures that the generated route is reachable and useful. If there is no contributing route, the generated route is not added to the routing table2.
B is correct because generated routes show a next hop in the routing table. A generated route inherits the next hop of its primary contributing route, which is the most preferred route among all the contributing routes2. The next hop of the generated route can be either an IP address or an interface name, depending on the type of the contributing route2. The next hop of the generated route can also be modified by a routing policy3.

NEW QUESTION # 185
Which statement correctly describes the difference between a BA classifier and a multifield (MF) classifier in Junos OS CoS?

A. BA classifiers and MF classifiers cannot be used together.
B. MF classifiers are applied only on egress interfaces.
C. An MF classifier can match on multiple fields, such as source/destination address and port, in addition to CoS markings, providing more granular classification than a BA classifier.
D. A BA classifier examines multiple packet header fields, while an MF classifier examines only one field.

Answer: C

Explanation:
While a behavior aggregate (BA) classifier assigns forwarding class and loss priority based on a single field such as DSCP or 802.1p bits, a multifield (MF) classifier, implemented using firewall filter match conditions, can classify traffic based on multiple packet attributes, including source/destination IP address, port numbers, and protocol, in addition to any existing CoS markings, providing much finer-grained classification control.

NEW QUESTION # 186
Which statement concerning Bidirectional Forwarding Detection (BFD) is true for the configuration shown in the exhibit?

A. The minimum-interval must match on both ends.
B. The link to neighbor 192.168.100.2 is not using BFD.
C. The effective interval for neighbor 192.168.100.2 is 500 ms.
D. The effective interval for neighbor 172.30.1.2 is 500 ms.

Answer: C

NEW QUESTION # 187
Which two statements describe NSR? (Choose two.)

A. NSR provides routing loop protection.
B. NSR rapidly detects link failures.
C. NSR requires GRES to function properly.
D. NSR provides high availability with multiple Routing Engines.

Answer: C,D

NEW QUESTION # 188
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