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Authorized JN0-351 Test Dumps - JN0-351 Latest Examprep

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Juniper JN0-351 Exam Syllabus Topics:

Topic
Details

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

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

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

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 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.

Topic 6

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 7

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 (Q87-Q92):

NEW QUESTION # 87
You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?

A. R2's route is not the best path due to a lower origin code.
B. R2's route is not the best path due to loop prevention.
C. R1's route is the best path due to a higher local preference
D. R1's route is the best path due to the shorter AS path.

Answer: C

Explanation:
The exhibit shows the output of the command show ip bgp, which displays information about the BGP routes in the routing table. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
The route from R1 has a local preference of 200, while the route from R2 has a local preference of 100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS). A higher local preference means a more preferred route.
BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router. If the weight is equal or not set, the next attribute that is compared is local preference.
In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers. Therefore, the next attribute that is compared is local preference.
Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table. The other attributes, such as origin code and AS path, are not considered in this case.

NEW QUESTION # 88
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

A. 1476 bytes
B. 1496 bytes
C. 1500 bytes
D. 1480 bytes

Answer: A

Explanation:
Explanation
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes1. This is because GRE packets are formed by the addition of the original packets and the required GRE headers1. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems1. The most common IP MTU is 1500-bytes in length (Ethernet)1. When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use1. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500)the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet -
24-bytes for the GRE encapsulation = 1476-Bytes1.

NEW QUESTION # 89
Referring to the exhibit, which three statements are correct? (Choose three.)

A. The IP source guard is enabled.
B. Dynamic ARP inspection is enabled.
C. DHCP snooping is enabled.
D. DHCP snooping is enabled for IPv6 traffic.
E. The DHCP snooping database is protected.

Answer: A,B,C

Explanation:
According to the Juniper documentation 1 , the output of the show vlans command displays the forwarding options for the VLAN, including the DHCP security features. In the exhibit, the output shows that DHCP security is enabled, and that ARP inspection and IP source guard are also enabled. These features work together to protect the switch from IP spoofing and ARP spoofing attacks. DHCP snooping builds a database of IP/MAC bindings by snooping DHCP messages. ARP inspection validates ARP packets against the DHCP snooping database and drops invalid packets. IP source guard checks the IP and MAC source addresses of packets against the DHCP snooping database and drops spoofed packets 2 3 . Therefore, the correct answer is A, B, and C.
The other options are not correct because:
* D. The DHCP snooping database is not protected by default. To protect the database from corruption or loss, you need to configure a file name and a location for storing the database, and enable periodic write operations to the file 4 . The exhibit does not show any such configuration.
* E. DHCP snooping is not enabled for IPv6 traffic by default. To enable DHCPv6 snooping, you need to configure a DHCPv6 relay agent and specify the trusted interfaces for DHCPv6 messages 5 . The exhibit does not show any such configuration.
References: show vlans | Junos OS , Understanding and Using DHCP Snooping | Junos OS , Understanding and Using Dynamic ARP Inspection (DAI) | Junos OS , Protecting the DHCP Snooping Database | Junos OS
, Understanding and Using DHCPv6 Snooping | Junos OS

NEW QUESTION # 90
Exhibit

Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)

A. On R3 disable Level 2 on the ge-0/0/4 interface.
B. On R1, enable Level 1 on the ge-0/0/1 interface.
C. On R3 enable Level 1 on the ge-0/0/4 interface
D. On R1, disable Level 2 on the ge-0/0/1 interface.

Answer: B,C

Explanation:
Explanation
A: On R1, enable Level 1 on the ge-0/0/1 interface. In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1. Level 1 systems route within an area2. If the destination is outside an area, Level 1 systems route toward a Level 2 system2. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.
D: On R3 enable Level 1 on the ge-0/0/4 interface Similarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3.
These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1 and Cisco34.

NEW QUESTION # 91
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of 192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?

A. R1 will be the BDR.
B. At least three routers are required for a DR/BDR election.
C. Router IDs must match for an adjacency to form.
D. R2 will be the BDR.

Answer: D

Explanation:
In OSPF, a DR (Designated Router) and a BDR (Backup Designated Router) are elected on each multi-access network, such as Ethernet or Frame Relay. The DR and BDR are responsible for exchanging routing information with other routers on the same network segment. The election is based on two criteria: the OSPF priority and the router ID. The router with the highest priority becomes the DR, and the router with the second-highest priority becomes the BDR. If the priorities are equal, the router with the highest router ID becomes the DR, and the router with the second-highest router ID becomes the BDR. The default priority is 1, and the router ID is either manually configured or derived from the highest IP address on any interface12.
In this scenario, R1 has a priority of 32 and a router ID of 192.168.1.2, and R2 has a priority of 64 and a router ID of 192.168.1.1. Since R2 has a higher priority than R1, it will become the BDR. The router ID does not matter in this case, because the priority is different. Therefore, the correct answer is C.
The other options are not correct because:
A). At least two routers are required for a DR/BDR election, not three2.
B). Router IDs do not have to match for an adjacency to form, they just have to be unique3.
D). R1 will not be the BDR, because it has a lower priority than R212.
References: Understanding OSPF Areas | Junos OS, OSPF DR/BDR Election explained - NetworkLessons.
com, OSPF adjacency - Cisco Community

NEW QUESTION # 92
......

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