JN0-351 Exam Quiz - JN0-351 Exam Book

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The Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) Desktop-based practice Exam is ideal for applicants who don't have access to the internet all the time. You can use this JN0-351 simulation software without an active internet connection. This JN0-351 software runs only on Windows computers. Both practice tests of ExamCost i.e. web-based and desktop are customizable, mimic Juniper JN0-351 Real Exam scenarios, provide results instantly, and help to overcome mistakes.

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The web-based format gives results at the end of every Juniper JN0-351 practice test attempt and points the mistakes so you can get rid of them before the final attempt. This online format of the Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) practice exam works well with Android, Mac, Windows, iOS, and Linux operating systems.

Juniper JN0-351 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 2
  • 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 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
  • BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
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
  • 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 7
  • 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 8
  • Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q54-Q59):

NEW QUESTION # 54
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.)

Answer: C,D

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 interface 1 . Level 1 systems route within an area 2 . If the destination is outside an area, Level 1 systems route toward a Level 2 system 2 . 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 Networks 1 and Cisco 3 4 .


NEW QUESTION # 55
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)

Answer: A,B

Explanation:
The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information 1
. This database is used to filter and validate DHCP messages from untrusted sources 1 .
However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:
* MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping. MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks 1 . This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.
* Static IP address : If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database
1 . The DHCP snooping feature relies on monitoring DHCP messages to build its database 1 , so devices with static IP addresses that do not send DHCP messages will not have their information added.
Therefore, options B and C are correct. Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database 1 , and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created 1 .


NEW QUESTION # 56
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Answer: A,C

Explanation:
Redundant Trunk Groups (RTGs) on EX Series switches provide a simple solution for network recovery when a trunk port on a switch goes down 1 . They are configured on the access switch and contain two links:
a primary or active link, and a secondary link 1 . Therefore, option B is correct because if the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence 1 .
Option D is also correct. In a typical enterprise network composed of distribution and access layers, RTGs are used where one Access switch is connected to two different uplink switches 2 . This implies that RTGs must be connected to the same aggregation switch 2 .


NEW QUESTION # 57
Which two statements correctly describe RSTP port roles? (Choose two.)

Answer: A,C

Explanation:
Explanation
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree1.
Option A suggests that the designated port forwards data to the downstream network segment or device. This is correct because the designated port is the port on a network segment that has the best path to the root bridge1. It's responsible for forwarding frames towards the root bridge and sending configuration messages into its segment1.
Option D suggests that the root port is responsible for forwarding data to the root bridge. This is also correct because the root port is always the link directly connected to the root bridge, or the shortest path to the root bridge1. It's used to forward traffic towards the root bridge1.
Therefore, options A and D are correct.


NEW QUESTION # 58
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem?
(Choose two.)

Answer: A,B

Explanation:
If the device connected to the interface has performed a DHCPRELEASE, it releases its IP address back to the DHCP server, resulting in the removal of the corresponding DHCP snooping entry.
If the device connected to the interface is using a static IP address, it will not send DHCP requests, and therefore no entries will be created in the DHCP snooping database for that device.


NEW QUESTION # 59
......

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