Curious about Actual Juniper Data Center Certification (JN0-351) Exam Questions?

Here are sample Juniper Enterprise Routing and Switching, Specialist (JN0-351) Exam questions from real exam. You can get more Juniper Data Center Certification (JN0-351) Exam premium practice questions at TestInsights.

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Total 65 questions
Question 1

Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)


Correct : B, C

Option B is correct.Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1.This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.

Option C is correct.Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23.This information is stored in a MAC address table, also known as a bridge table23.

Option A is incorrect.Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.

Option D is incorrect.Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.


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Question 2

Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)


Correct : A, C

Ais correct because you can deploy only stateless firewall filters on an EX Series switch.A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers1.A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or session information1.EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters2.

Cis correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks3.EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters4. You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.


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Question 3

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?


Correct : C

The exhibit shows the output of the commandshow ip bgp, which displays information about the BGP routes in the routing table1. 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 route2.

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 precedence3.The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router3.If the weight is equal or not set, the next attribute that is compared is local preference3.

In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers3. 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 table3. The other attributes, such as origin code and AS path, are not considered in this case.


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Question 4

What are two reasons for creating multiple areas in OSPF? (Choose two.)


Correct : A, D

Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time . This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.

Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.


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Question 5

Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)


Correct : A, D

Ais correct because when an OSPF adjacency is established, a router will advertise a connected network to OSPF neighbors.An OSPF adjacency is a logical relationship between two routers that agree to exchange routing information using the OSPF protocol1.To establish an OSPF adjacency, the routers must be in the same area, have compatible parameters, and exchange hello packets1.Once an OSPF adjacency is formed, the routers will exchange database description (DBD) packets, which contain summaries of their link-state databases (LSDBs)1.The LSDBs include information about the connected networks and their costs2. Therefore, when an OSPF adjacency is established, a router will advertise a connected network to OSPF neighbors through DBD packets.

Dis correct because when a static route to the 224.0.0.5 address is created, a router will advertise a connected network to OSPF neighbors.The 224.0.0.5 address is the multicast address for all OSPF routers3.A static route to this address can be used to send OSPF hello packets to all OSPF neighbors on a network segment3.This can be useful when the network segment does not support multicast or when the router does not have an IP address on the segment3.When a static route to the 224.0.0.5 address is created, the router will send hello packets to this address and establish OSPF adjacencies with other routers on the segment3. As explained above, once an OSPF adjacency is formed, the router will advertise a connected network to OSPF neighbors through DBD packets.


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Total 65 questions