JN0-351 Sample Questions | JN0-351 Dumps Questions

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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
BGP	- BGP configuration and troubleshooting
IS-IS	- IS-IS configuration and troubleshooting
Layer 2 Switching or VLANs	- Ports and tagging - Configuration, monitoring, and troubleshooting - VLAN concepts and functionalities - Bridging components - Native VLANs and voice VLANs - Frame processing - Inter-VLAN routing
High Availability	- High availability design and integration - VRRP and redundancy protocols
OSPF	- OSPF configuration and troubleshooting
Protocol Independent Routing	- Routing fundamentals
Layer 2 Security	- Common Layer 2 attack mitigation - Dynamic ARP inspection - Port security implementation - DHCP snooping
Tunnels	- Tunnel technologies
Spanning Tree Protocol	- Port roles interpretation - Convergence issues identification - STP topology design and troubleshooting - Loop prevention and redundancy - Bridge priority and port cost optimization

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q38-Q43):

NEW QUESTION # 38
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

A. static route using the resolve feature
B. aggregate route
C. static route using qualified next hops
D. generate route

Answer: D

Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.

NEW QUESTION # 39
Which statement is correct regarding link aggregation groups (LAGs) in Junos OS?

A. LACP is mandatory for all LAG configurations.
B. A LAG combines multiple physical links into a single logical interface to increase bandwidth and provide redundancy.
C. LAG member links must be on different switches without any additional protocol.
D. LAGs cannot carry tagged VLAN traffic.

Answer: B

Explanation:
A Link Aggregation Group (LAG) bundles multiple physical Ethernet links into a single logical interface (ae interface in Junos), increasing available bandwidth and providing redundancy in case one member link fails. While LACP (Link Aggregation Control Protocol) is commonly used to dynamically negotiate and monitor the aggregated links, static LAGs without LACP are also supported.

NEW QUESTION # 40
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)

A. Member links are required to be contiguous ports.
B. Duplex and speed settings are not required to match on both participating devices.
C. Member links are not required to be contiguous ports.
D. Duplex and speed settings are required to match on both participating devices.

Answer: C,D

Explanation:
Up to 64 Ethernet interfaces can be grouped to form a LAG, and In a Junos Fusion, up to 1,000 LAGs are supported on QFX10002 switches acting as aggregation devices.
The LAG must be configured on both sides of the link.
The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.

NEW QUESTION # 41
You implemented the MAC address limit feature with the shutdown action on all interfaces on your switch.
In this scenario, which statement is correct when a violation occurs?

A. By default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.
B. By default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.
C. By default, you must manually clear the violation for the interface to send and receive traffic again.
D. By default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.

Answer: C

Explanation:
When the MAC address limit feature with the shutdown action is implemented on a switch, if a violation occurs, the interface is disabled and a system log entry is generated. If the switch has been configured with the port-error-disable statement, the disabled interface recovers automatically upon expiration of the specified disable timeout. However, if the switch has not been configured for auto-recovery from port error disabled conditions, you must manually clear the violation by running the clear ethernet-switching port-error command for the interface to send and receive traffic again. This explanation is based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.

NEW QUESTION # 42
Exhibit

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 1 . 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) 2 . A higher local preference means a more preferred route 2 .
* 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 3
. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router 3 . If the weight is equal or not set, the next attribute that is compared is local preference 3 .
* In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers 3 . 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 3 . The other attributes, such as origin code and AS path, are not considered in this case.

NEW QUESTION # 43
......

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