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Juniper Exam JN0-351 Topic 5 Question 15 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 15
Topic #: 5
[All JN0-351 Questions]

You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)

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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 Lizbeth at Apr 14, 2024, 02:07 PM

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Quentin
8 days ago
You know, I'm just happy they're not asking us about the inner workings of a quantum computer. That would really throw me for a loop!
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Josephine
10 days ago
Hmm, MAC limiting and dynamic ARP inspection both seem like they could potentially impact DHCP snooping. But a static IP address? That's an interesting one.
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Linette
11 days ago
Okay, let's start by looking at the options. A DHCPRELEASE sounds like it could be a valid reason, but what about the other choices?
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Vincenza
12 days ago
Ah, I see. This is testing our knowledge of DHCP and how it interacts with the switch configuration. Let's see what we can come up with here.
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Elliott
14 days ago
Ooh, this is a good one! I have some experience with DHCP snooping, so let me share my thoughts.
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Chandra
15 days ago
Hmm, this question seems a bit tricky. I'm not too familiar with DHCP snooping, so I'll have to think about this one carefully.
upvoted 0 times
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