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Juniper JN0-351 Exam Syllabus Topics:

Topic
Details

Topic 1

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 2

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 3

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 4

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 5

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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q74-Q79):

NEW QUESTION # 74
Referring to the output shown in the exhibit, which statement is correct?

A. The state is normal for a DR neighbor.
B. An area ID mismatch exists between the OSPF neighbors
C. The state is normal for a DRother neighbor
D. An MTU mismatch exists between the OSPF neighbors.

Answer: C

Explanation:
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers. The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers. This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network. These neighbors are often referred to as "DRothers". Therefore, option B is correct.

NEW QUESTION # 75
What is the default MAC age-out timer on an EX Series switch?

A. 300 seconds
B. 30 seconds
C. 30 minutes
D. 300 minutes

Answer: A

Explanation:
Explanation
The default MAC age-out timer on an EX Series switch is 300 seconds12. The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed31. This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces1. When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces1.

NEW QUESTION # 76
What is a purpose of using a spanning tree protocol?

A. to tunnel Ethernet frames
B. to look up MAC addresses
C. to eliminate broadcast storms
D. to route IP packets

Answer: C

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 # 77
You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

A. The routes displayed have traversed one or more autonomous systems.
B. The routes displayed are being learned from an I BGP peer.
C. The output shows routes that are active and rejected by an import policy.
D. The output shows routes that were received prior to the application of any BGP import policies.

Answer: A,D

Explanation:
The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route's traversal through one or various autonomous systems.
The output displays the selected routes and the attributes with which they were received, but does not show the effects of import policy on the routing attributes.
Nothing indicates that the routes have been received from an IBGP peer. The asterisks only indicates whether the routes have been imported into the routing table (RIB) after the application of the import policies.
https://www.juniper.net/documentation/us/en/software/junos/cli-
reference/topics/ref/command/show-route-receive-protocol.html

NEW QUESTION # 78
Which two statements are correct about VRRP? (Choose two.)

A. The VRRP group number must be unique on all participating devices
B. The virtual IP address must be unique on all participating devices
C. The VRRP group number must match on all participating devices
D. The virtual IP address must match on all participating devices

Answer: C,D

Explanation:
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.

NEW QUESTION # 79
......

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