Juniper jn0-349 practice test

Exam Title: Enterprise Routing and Switching, Specialist (JNCIS-ENT)

Last update: Dec 25 ,2025
Question 1

What are two characteristics of OSPF ABRs? (Choose two.)

  • A. ABRs transmit routing information between the backbone and other areas.
  • B. ABRs cannot be part of the backbone and another area at the same time.
  • C. ABRs inject information from outside the OSPF domain.
  • D. ABRs link two OSPF areas
Answer:

A, D


Explanation:
Area border router (ABR): An OSPF router with links in two areas, the ABR is responsible for
connecting OSPF areas to the backbone. It transmits network information between the backbone
and other areas.

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Question 2

Exhibit.

Referring to the exhibit, which configuration will force traffic to always use ae0.0 as long as it is
active?


  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D
Answer:

C


Explanation:
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/redundant-trunk-groups.html
1. set protocols rstp disable
2. set redundant-trunk-group group name interface interface-name primary
3. set redundant-trunk-group group name interface interface-name
4. option: set redundant-trunk-group group name preempt-cutover-timer seconds
Rapid Spanning Tree Protocol (RSTP) is enabled by default on EX Series switches to create a loop-
free topology, but an interface is not allowed to be in both a redundant trunk group and in a
spanning-tree protocol topology at the same time.

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Question 3

Exhibit.

Click the Exhibit button Referring to the exhibit, what will be the IS-IS adjacency result of the
configurations?

  • A. A level 1 and level 2 IS-IS adjacency will form
  • B. A level 2 IS4S adjacency will form
  • C. No IS-IS adjacencies will form
  • D. A level 1 IS-IS adjacency will form
Answer:

C


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Question 4

Which two sequences correctly describe the processing order of firewall filters on an EX Series
switch? (Choose two.)

  • A. router filter > VLAN filter > port filter > transmit packet
  • B. port filter > VLAN filter > router filter > transmit packet
  • C. receive packet > port filter > VLAN filter > router filter
  • D. receive packet > router filter > VLAN filter > port filter
Answer:

BD


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Question 5

In which two STP states is a port active and a MAC address learned? (Choose two.)

  • A. Blocking
  • B. Forwarding
  • C. Disabled
  • D. Learning
Answer:

B, D


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Question 6

Which statement is true when using LAGs with an EX4300?

  • A. Speeds on member links can differ.
  • B. Member links must be contiguous.
  • C. Half duplex is supported on the LAG.
  • D. You can have up to 16 member links per LAG.
Answer:

D


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Question 7

Exhibit.

Which statement is true about the configuration shown in the exhibit?

  • A. Both the add-community and local-pref import policies will be evaluated routes are learned from neighbor 172.30.2.1.
  • B. Only the local –pref import will be evaluated when routes are learned neighbor 172.301.1.
  • C. No import policy will be evaluated when routes are learned from neighbor 172.30.2.1.
  • D. Only the add-community import policy will be evaluated routers are learned neighbor 172.30.1.1.
Answer:

B


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Question 8

Click the Exhibit button.

You want to prevent rogue BPDUs from lab devices reaching the internal through the Lab_Switch
device.
Referring to the exhibit, what should be done to accomplish this task?

  • A. Configure the three lab ports as edge ports
  • B. Configure an input filter on interface xe-0/2/0 to discard the RSTP packets
  • C. Configure the three lab ports under the protocols layer2-control bpdu-block hierarchy on the switch
  • D. Configure protocols rstp with the bpdu-block-on-edge parameter for interface xe-0/2/0
Answer:

C


Explanation:
https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/bpdu-block-edit-protocols-layer2-control.html

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Question 9

Exhibit.

In the exhibit, each IP subnet in the network is associated with a unique VLAN ID
Which action wilt ensure that Host C will communicate with host A and Host B?

  • A. Configure an IRB interface for each VLAN and associate it with its corresponding VLAN
  • B. Configure all switch ports connecting to the host devices as access ports associated with a common VLAN.
  • C. Configure a port-based ACL that permits inter-VLAN routing for all configured VLANs.
  • D. Configure all switch ports connecting to the host devices as trunk ports associated with all VLANS.
Answer:

B


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Question 10

Which statement is correct about 1S IS link state PDUs?

  • A. They are used to maintain link slid.: database synchronization
  • B. They are used to establish adjacencies
  • C. They are used to build the link state database.
  • D. They are used to determine whether the neighbors are Level 1 or Level 2
Answer:

C


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