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Exam JN0-649 topic 1 question 32 discussion

Actual exam question from Juniper's JN0-649
Question #: 32
Topic #: 1
[All JN0-649 Questions]

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Your network has an unmanaged switch between the hosts and your EX Series switch. After the traffic enters the EX Series switch, each host must be on a separate VLAN.
How would you accomplish this task?

  • A. Configure an input firewall filter on interface ge-0/0/3 to match the source MAC or IP address of the hosts to assign the VLANs.
  • B. Configure an output firewall filter on interface ge-0/0/1 to match the destination MAC or IP address of the hosts to assign the VLANs.
  • C. Configure interface ge-0/0/3 to a mode trunk to assign the VLANs.
  • D. Configure VSTP on interface ge-0/0/1 to assign the VLANs.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Wallsee at Dec. 17, 2022, 3:35 p.m.

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DarkSpirit
Highly Voted 1 year, 11 months ago
Selected Answer: A
EX switches has VLAN action on ingress interfaces to forward traffic to specific VLAN. https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/topic-map/firewall-filter-match-condtions-and-actions-qfx.html vlan VLAN-name Forward matched packets to a specific VLAN. NOTE: The vlan action is supported on ingress interfaces only.
upvoted 7 times
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anonymonkey
Most Recent 9 months, 2 weeks ago
The key is contained within answer C itself as the diagram leads one to think the devices already reside within their respective VLANs. “Configure interface ge-0/0/3 to a mode trunk to assign the VLANs. VLANs within a trunk interface can be allowed not assigned. This function is accomplished via answer A. This is a very tricky question especially the way the diagram is represented. 
A is the correct answer.
upvoted 2 times
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harrypogi
1 year, 2 months ago
Selected Answer: A
a is correct
upvoted 2 times
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Mahdi
1 year, 4 months ago
should be A
upvoted 1 times
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Rudy6969
1 year, 10 months ago
trunk interfaces dont assign vlans on their own. besides, since the switch is unmanaged, the traffic from the 3 devices will be untagged and dropped on a trunk interface, unless you assign all the traffic to the native-vlan
upvoted 2 times
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Wallsee
1 year, 11 months ago
should be C
upvoted 1 times
...

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C (25%)
B (20%)
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