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Juniper JN0-351 Exam - Topic 3 Question 52 Discussion

Which statement is correct about IP-IP tunnels?
A) IP-IP tunnels only support encapsulating IP traffic.
D) There are 24 bytes of overhead with IP-IP encapsulation.
C) The TTL in the inner packet is decremented during transit to the tunnel endpoint.
B) IP-IP tunnels only support encapsulating non-IP traffic.

Juniper JN0-351 Exam - Topic 3 Question 52 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 52
Topic #: 3
[All JN0-351 Questions]

Which statement is correct about IP-IP tunnels?

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Suggested Answer: A

IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels only support encapsulating IP traffic, which means that the payload of the inner packet must be an IP packet.IP-IP tunnels cannot encapsulate non-IP traffic, such as Ethernet frames or MPLS labels1.

Option A is correct, because IP-IP tunnels only support encapsulating IP traffic. Option B is incorrect, because IP-IP tunnels only support encapsulating non-IP traffic. Option C is incorrect, because the TTL in the inner packet is not decremented during transit to the tunnel endpoint.The TTL in the outer packet is decremented by each router along the path, but the TTL in the inner packet is preserved until it reaches the tunnel endpoint2. Option D is incorrect, because there are 20 bytes of overhead with IP-IP encapsulation.The overhead consists of the header of the outer packet, which has a fixed size of 20 bytes for IPv43.


1:IP-IP Tunneling2:What is tunneling? | Tunneling in networking3: IPv4 - Header

by Georgene at Jan 27, 2026, 07:12 AM

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Laquita
24 days ago
They help in routing.
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Jennifer
29 days ago
IP-IP tunnels encapsulate packets.
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Joaquin
1 month ago
They can help with network segmentation, right?
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Georgene
1 month ago
I thought they were outdated, but I guess not!
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Leonora
2 months ago
Wait, are they really secure though?
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Luisa
2 months ago
Totally agree, they're great for routing!
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Merrilee
2 months ago
IP-IP tunnels encapsulate one IP packet within another.
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Giuseppe
2 months ago
IP-IP tunnels are a type of tunneling protocol that can be used for network security.
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Rebbecca
2 months ago
IP-IP tunnels are used to create a virtual private network (VPN) connection.
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Daniela
2 months ago
IP-IP tunnels allow encapsulation of IP packets within other IP packets.
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Salome
3 months ago
I believe the correct statement might involve how they allow for different network protocols to communicate, but I need to double-check that.
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Jovita
3 months ago
I feel like there was something about the overhead involved with IP-IP tunnels, but I can't recall the exact details.
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Lonna
3 months ago
I remember practicing a question about tunneling protocols, and I think IP-IP tunnels are related to how they handle routing.
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Zana
4 months ago
I think IP-IP tunnels are used to encapsulate packets, but I'm not entirely sure about the specifics of how they work.
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Tiffiny
4 months ago
I've got a good handle on IP-IP tunnels. This is a straightforward networking concept that I'm familiar with. I'll lay out the key points in my answer.
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Johana
4 months ago
IP-IP tunnels... ugh, I'm drawing a blank here. I'll have to review my notes quickly before attempting to answer this. Tunneling concepts can be tricky.
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Harley
4 months ago
Okay, IP-IP tunnels, got it. I remember learning about those in my networking class. I feel pretty confident I can work through this question step-by-step.
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Sanjuana
4 months ago
Hmm, IP-IP tunnels... I'm a bit fuzzy on the specifics there. Let me think through what I do know about tunneling protocols and see if I can piece this together.
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Rodrigo
5 months ago
I think I know how to approach this. IP-IP tunnels are used to encapsulate one IP packet inside another, right? I'll need to remember the key details about how that works.
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