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Cisco 300-420 Exam - Topic 9 Question 119 Discussion

Actual exam question for Cisco's 300-420 exam

Question #: 119
Topic #: 9

[All 300-420 Questions]

When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

Aencapsulation of traffic with GRE or VTI

BIPsec forwarding using transport mode

Cadditional bandwidth for headend

DIPsec forwarding using tunnel mode

Show Suggested Answer

Suggested Answer: A

by Layla at Nov 22, 2025, 05:06 PM

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Janey

5 months ago

Definitely! Tunnel mode is the way to go for multicast traffic.

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Sharika

5 months ago

I feel like B) transport mode won't work for multicast. It's too limited.

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Loreen

5 months ago

A is good, but D is more specific for IPsec.

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Elbert

5 months ago

But what about A) encapsulation with GRE? Isn't that also a valid option?

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Bettina

5 months ago

Agreed! Tunnel mode is essential for multicast support.

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Odette

5 months ago

Yeah, extra bandwidth is a must for headend, but tunnel mode is crucial!

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Mirta

6 months ago

A little surprised that multicast needs such specific handling.

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Stephane

6 months ago

Wait, are we sure about that? I thought GRE was needed too.

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Anabel

6 months ago

Totally agree, tunnel mode is the way to handle it!

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Matt

7 months ago

I'd rather have a VPN that supports interpretive dance than one that can't handle a little multicast action.

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Vonda

7 months ago

Tunnel mode is the way to go, otherwise your multicast packets will be lost in the void like my hopes and dreams.

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Deandrea

7 months ago

B) IPsec forwarding using transport mode won't work for IP Multicast, as it doesn't provide the necessary encapsulation.

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Caitlin

7 months ago

C) additional bandwidth for headend is a valid consideration, but it's not a unique requirement for IP Multicast support.

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Vi

7 months ago

A) encapsulation of traffic with GRE or VTI would also work, but it's not a unique requirement for supporting IP Multicast in IPsec VPNs.

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Albert

7 months ago

D) IPsec forwarding using tunnel mode is the correct answer, as multicast traffic requires the use of tunnel mode to properly encapsulate the packets.

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Kanisha

8 months ago

I’m leaning towards tunnel mode being the right answer, but I recall there being some nuances with transport mode that could apply too.

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Lorenza

8 months ago

I feel like we practiced a question similar to this, and I think GRE was mentioned as a way to handle multicast traffic.

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Silva

8 months ago

I'm pretty confident D is the right answer. Tunnel mode is required to support IP Multicast traffic in an IPsec VPN. The other options don't specifically address that need.

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Lawanda

8 months ago

Wait, I'm not sure. Tunnel mode is used for site-to-site VPNs, right? Does that apply to IP Multicast as well? I'm a bit confused on this one.

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Ivan

8 months ago

Okay, I've got this. The answer has to be D - IPsec forwarding using tunnel mode. That's the only option that specifically addresses the IP Multicast requirement.

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Gerald

8 months ago

Gotta go with D, tunnel mode is key for multicast.

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Harris

9 months ago

I think I remember something about needing to use tunnel mode for multicast support, but I'm not entirely sure if that's the only requirement.

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Kimbery

9 months ago

I think it's D) IPsec forwarding using tunnel mode. Multicast needs that.

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Linn

9 months ago

I’m a bit confused about the options. Does additional bandwidth really matter for multicast over IPsec, or is it more about the encapsulation method?

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Sarah

9 months ago

I think the key here is the mention of IP Multicast. That's probably the unique requirement we need to focus on.

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Alaine

10 months ago

Hmm, I'm not too familiar with the requirements for IP Multicast support in IPsec VPNs. I'll need to review my notes on that.

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Mozell

4 months ago

Transport mode might not handle multicast properly.

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Kathryn

4 months ago

I remember something about needing extra bandwidth too.

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Lisbeth

4 months ago

Tunnel mode is also a key factor, isn't it?

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Micheal

4 months ago

Yeah, GRE or VTI sounds right for multicast.

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Lynelle

9 months ago

I think it's about the encapsulation of traffic.

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