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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	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 3	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 4	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 5	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 6	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q121-Q126):

NEW QUESTION # 121
Which statement correctly describes the function of a Junos OS "generated route"?

A. It cannot be redistributed into other protocols.
B. It is a static route created manually with a single next hop.
C. It only applies to OSPF external routes.
D. It is a route dynamically created based on the existence of one or more contributing routes in the routing table, often used for route summarization.

Answer: D

Explanation:
A generated route in Junos OS is a type of aggregate-like route that becomes active in the routing table only when at least one contributing (more specific) route is present. Generated routes are commonly used for route summarization, allowing an administrator to advertise a summarized prefix only when the underlying specific routes actually exist.

NEW QUESTION # 122
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 loop prevention.
B. R1's route is the best path due to a higher local preference
C. R2's route is not the best path due to a lower origin code.
D. R1's route is the best path due to the shorter AS path.

Answer: B

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 # 123
Which two statements correctly describe RSTP port roles? (Choose two.)

A. The designated port forwards data to the downstream network segment or device.
B. The root port is responsible for forwarding data to the root bridge.
C. The backup port is used as a backup for the root port.
D. The alternate port is a standby port for an edge port.

Answer: A,B

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 # 124
Which statement about aggregate routes is correct?

A. Aggregate routes are used for advertising summarized network prefixes.
B. Aggregate routes can only be used for static routing but not for dynamic routing protocols.
C. Aggregate routes are automatically generated for all of the subnets in a routing table.
D. Aggregate routes are always preferred over more specific routes, even when the specific routes have a better path.

Answer: A

Explanation:
Explanation
Aggregate routes are used for advertising summarized network prefixes12. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.
Therefore, option D is correct. Options A, B, and C are not correct because:
Aggregate routes can be used with both static routing and dynamic routing protocols1.
Aggregate routes are not automatically generated for all of the subnets in a routing table. They need to be manually configured1.
Aggregate routes are not always preferred over more specific routes. The route selection process in Junos OS considers several factors, including route preference and metric, before determining the active route1.

NEW QUESTION # 125
Referring to the exhibit, which three statements are correct? (Choose three.)

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

Answer: C,D,E

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 # 126
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