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Juniper JN0-351 Exam - Topic 1 Question 33 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 33
Topic #: 1
[All JN0-351 Questions]

An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.

Which two commands enable this behavior? (Choose two.)

Show Suggested Answer Hide Answer
Suggested Answer: B, C

The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information1.This database is used to filter and validate DHCP messages from untrusted sources1.

However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:

MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping.MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks1. This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.

Static IP address: If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database1.The DHCP snooping feature relies on monitoring DHCP messages to build its database1, so devices with static IP addresses that do not send DHCP messages will not have their information added.

Therefore, options B and C are correct.Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database1, and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created1.


by Linsey at Oct 22, 2024, 09:21 AM

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Louann
3 months ago
Surprised there's no mention of security zones here!
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Lenna
3 months ago
A and D are the ones I use all the time!
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Myra
3 months ago
Wait, is C even a valid command?
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Rueben
4 months ago
Definitely agree with B, but D seems off.
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Ligia
4 months ago
I think it's B and D for sure.
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Leeann
4 months ago
I think "set system management---instance" sounds familiar, but I can't recall if it's the right context for this question.
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Angelo
4 months ago
I’m a bit confused about the difference between the management instance and the routing instance. I hope I remember the right syntax for it.
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Herminia
4 months ago
I remember practicing similar questions, and I feel like "set routing---instances mgmt_junos" is definitely one of the right answers.
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Lisandra
5 months ago
I think the commands related to "routing-instances" are key here, but I'm not sure if it's "mgmt_junos" or "mgmtjunoa."
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Lazaro
5 months ago
I'm a little confused by the wording of the question. Does it mean we need to create a new routing instance called "mgmt_junos" and then associate an interface with it? Or is there a different way to approach this?
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Ben
5 months ago
Okay, I've got this. The commands to enable this behavior are "set routing-instances mgmt_junos" and "set routing-instances mgmt_junos interface [interface-name]". Simple and effective.
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Dorian
5 months ago
I'm a bit unsure about this one. Isolating management traffic in a separate routing instance sounds like the right approach, but I'm not sure which specific commands to use.
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Mollie
5 months ago
Hmm, this seems straightforward. I think the key is to isolate the management traffic in a non-default routing instance. Let me think through the options carefully.
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Glen
10 months ago
Alright, time to put my Junos knowledge to the test! A and D it is. Let's hope the exam gods are kind to me today.
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Arlyne
9 months ago
User 3: Good luck, you two! I'm sure you'll do great.
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Agustin
9 months ago
User 2: I agree, let's hope we got it right for the exam.
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Chantell
9 months ago
User 1: I think A and D are the correct commands to enable the behavior.
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Keva
10 months ago
Haha, I bet the exam writers are just trying to trip us up with those weird interface names. 'em1' and 'ge-0/0/0.0' - who comes up with this stuff?
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Truman
9 months ago
C) set system management---instance
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Kip
9 months ago
Yeah, those interface names are definitely confusing.
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Joanna
10 months ago
B) set routing---instances mgmtjunoa interface ge-0/0/0.0
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Geraldine
10 months ago
A) set routing---instances mgmt_junos interface em1
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Ashlyn
10 months ago
I'm pretty sure B and C are wrong. Junos devices use the 'routing-instances' command, not 'management-instance'.
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Alexis
10 months ago
Option A and D seem like the right choices here. Gotta isolate that management traffic in a separate routing instance.
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Janessa
9 months ago
User 2
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Detra
10 months ago
User 1
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Aide
11 months ago
I'm not sure, but I think A and C might be the right choices.
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Karl
11 months ago
I disagree, I believe the correct answers are B and D.
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Remedios
11 months ago
I think the answer is A and B.
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