Cisco Exam 300-440 Topic 3 Question 6 Discussion

Actual exam question for Cisco's 300-440 exam

Question #: 6
Topic #: 3

Refer to the exhibit.

While troubleshooting an IPsec connection between a Cisco WAN edge router and an Amazon Web Services (AWS) endpoint, a network engineer observes that the security association status is active, but no traffic flows between the devices What is the problem?

Awrong ISAKMP policy

Bidentity mismatch

Cwrong encryption

DIKE version mismatch

Show Suggested Answer

Suggested Answer: B

An identity mismatch occurs when the local and remote identities configured on the IPsec peers do not match. This can prevent the establishment of an IPsec tunnel or cause traffic to be dropped by the IPsec policy. In this case, the network engineer should verify that the local and remote identities configured on the Cisco WAN edge router and the AWS endpoint match the values expected by each peer. The identities can be an IP address, a fully qualified domain name (FQDN), or a distinguished name (DN). The identities are exchanged during the IKE phase 1 negotiation and are used to authenticate the peers. If the identities do not match, the peers will reject the IKE proposal and the IPsec tunnel will not be established or will be torn down.Reference:=

Configure IOS-XE Site-to-Site VPN Connection to Amazon Web Services, Topic: Troubleshooting

Designing and Implementing Cloud Connectivity (ENCC) v1.0, Module 3: Implementing Cloud Connectivity, Lesson 2: Implementing Cisco SD-WAN Cloud OnRamp for IaaS, Topic: Troubleshooting Cisco SD-WAN Cloud OnRamp for IaaS

Cisco IOS Security Configuration Guide, Release 15M&T, Chapter: Configuring IPsec Network Security, Topic: Configuring IPsec Identity and Peer Addressing

by Latrice at Mar 08, 2024, 05:00 PM

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Lenna

6 months ago

Hmm, that's a valid point. But I still think wrong ISAKMP policy is more likely.

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Allene

6 months ago

I believe it could be an identity mismatch causing the traffic flow issue.

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Rebecka

6 months ago

I agree with Lenna, a wrong ISAKMP policy could be causing the issue.

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Lenna

6 months ago

I think the problem might be a wrong ISAKMP policy.

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Reynalda

6 months ago

Hmm, that's a valid point. But I still think wrong ISAKMP policy is more likely.

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Alline

6 months ago

I believe it could be an identity mismatch causing the traffic flow issue.

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Talia

7 months ago

I agree with Reynalda, a wrong ISAKMP policy could be causing the issue.

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Reynalda

7 months ago

I think the problem might be a wrong ISAKMP policy.

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Georgeanna

8 months ago

Hmm, the identity mismatch idea sounds plausible too. Maybe the devices are not properly identifying each other, even though the security association is up. I guess we'll have to carefully consider all the options here.

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Claribel

7 months ago

I think we should check the IKE version as well. Could be a compatibility issue.

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Dawne

8 months ago

Yeah, that's a good point. Encryption is crucial for IPsec connections to work properly.

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Eric

8 months ago

Maybe it's the encryption that's causing the issue. The wrong algorithm or key possibly.

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Myra

8 months ago

D) IKE version mismatch

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Anabel

8 months ago

C) wrong encryption

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Deonna

8 months ago

B) identity mismatch

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Casie

8 months ago

A) wrong ISAKMP policy

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Jesusita

8 months ago

Personally, I'm leaning towards the wrong encryption option. If the encryption settings are not properly configured, that could definitely cause the connection to be active but not passing any traffic.

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Lasandra

8 months ago

I agree, Shawnta. It's a bit puzzling. My initial thought is that it could be an identity mismatch, but I'm not entirely certain. What do you guys think?

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Shawnta

8 months ago

Hmm, this question seems tricky. I'm not sure if I fully understand the issue here. The fact that the security association is active but no traffic is flowing seems like a bit of a paradox.

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