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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]

Which two statements are correct about tunnels? (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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Gerald
4 days ago
I don't know about you guys, but I'm just hoping I don't get a question about tunnels on the exam. They always seem to have some tricky details.
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Candida
9 days ago
Haha, IP-IP tunnels being stateful? What is this, the 90s? Clearly B and D are the way to go.
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William
25 days ago
I'm not sure about BFD and tunnels, but I agree that tunnels are stateful and add overhead. D and B are my picks.
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Ernie
7 days ago
I think BFD can't be used to monitor tunnels.
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Belen
26 days ago
I'm not sure about statement C, but I think B and D are correct based on my understanding of tunnels.
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Isabelle
28 days ago
I agree with Howard. Statement D is also correct because tunnels do add overhead to packet size.
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Marylin
30 days ago
B and D seem like the correct answers to me. Tunnels definitely require valid routes to the remote endpoint, and they do add overhead to the packet size.
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Lashaun
2 days ago
IP-IP tunnels are actually stateless, so C is not correct.
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Christa
3 days ago
BFD cannot be used to monitor tunnels, so A is incorrect.
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Stephen
5 days ago
Yes, tunnels definitely need valid routes to the remote endpoint.
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Remona
9 days ago
I think B and D are correct too. Tunnels do add overhead to packet size.
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Howard
1 months ago
I think statement B is correct because tunnels need a valid route to the remote endpoint.
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