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Juniper JN0-351 Exam - Topic 5 Question 8 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 8
Topic #: 5
[All JN0-351 Questions]

You are concerned about spoofed MAC addresses on your LAN.

Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)

Show Suggested Answer Hide Answer
Suggested Answer: A, C

Ais correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks.DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping1.DAI discards any ARP packets that do not match the database or have invalid formats1.

Cis correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted.Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports2.DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client2.


by Ezekiel at Nov 21, 2023, 10:30 AM

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Golda
3 months ago
IP source guard is underrated, good call!
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Tess
3 months ago
Agreed, dynamic ARP inspection is a must!
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Paris
3 months ago
Wait, can static ARP really help with spoofing? Seems risky.
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Merilyn
4 months ago
I think DHCP snooping is also important, though.
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Buck
4 months ago
Definitely go with dynamic ARP inspection and IP source guard!
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Carol
4 months ago
I practiced a question like this before, and I think dynamic ARP inspection and IP source guard were the right choices.
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Erin
4 months ago
DHCP snooping sounds familiar, but I can't recall if it directly relates to MAC spoofing.
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Freeman
4 months ago
I think IP source guard is definitely one of the answers, but I'm a bit hazy on the second option.
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Christene
5 months ago
I remember studying about ARP inspection, but I'm not sure if it's dynamic or static that helps with spoofing.
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Buddy
5 months ago
This seems straightforward. DHCP snooping and IP source guard are the two Layer 2 security features that can help minimize the concern about spoofed MAC addresses on the LAN. I'm confident those are the right choices.
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Agustin
5 months ago
I'm a little confused by the wording of this question. Isn't MAC address spoofing more of a Layer 2 issue? I'm not sure if IP source guard is the best choice here. I'll go with DHCP snooping and dynamic ARP inspection.
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Luz
5 months ago
Okay, let's see. Dynamic ARP inspection and DHCP snooping are both good options to prevent MAC address spoofing. I'll mark those two choices.
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Shenika
5 months ago
Hmm, I'm a bit unsure about this one. I know DHCP snooping is used to prevent rogue DHCP servers, but I'm not sure how that relates to MAC address spoofing. I'll have to think this through carefully.
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Leonora
5 months ago
This question is pretty straightforward. I'll go with DHCP snooping and IP source guard to minimize the spoofed MAC address concern.
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Vallie
5 months ago
The answer is definitely False. The auditor's responsibility is to evaluate the anti-fraud controls, not to establish them. The organization itself has the primary responsibility for designing and implementing those controls.
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Eleonora
5 months ago
Option D sounds right to me. It makes sense that if patients see Dr. Chan as independent, it might limit Eagle's liability. We had a practice question like this before, didn't we?
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Dalene
5 months ago
I'm pretty confident that the answer is B. Exposing or publishing the ports is the standard way to access containers on a bridge network from outside the host.
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