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Cisco 300-820 Exam - Topic 23 Question 107 Discussion

An engineer attempts to upload a server certificate to an Expressway-C server but receives an error when they click the upload button that says that the file is invalid. The engineer is advised that this happens because the certificate was signed incorrectly and is missing an attribute. What must the engineer do to upload the certificate?
C) Create a new certificate template with 'Server authentication'' and 'Client authentication' enabled and use this template when signing the Expressway server certificate.
A) Create a certificate request via Certificate Services Web Page and ensure that the certificate validity period is five years because the Expressway server validates this during certificate import.
B) Create a certificate request via the Certificate Services Web Page and ensure that the Subject Common Name field contains the server FQDN and all Cisco Unified CM phone security profile names.
D) Create a new certificate template with the certificate attribute 'Allow private key to be exported' enabled and use this template when signing the Expressway server certificate.

Cisco 300-820 Exam - Topic 23 Question 107 Discussion

Actual exam question for Cisco's 300-820 exam
Question #: 107
Topic #: 23
[All 300-820 Questions]

An engineer attempts to upload a server certificate to an Expressway-C server but receives an error when they click the upload button that says that the file is invalid. The engineer is advised that this happens because the certificate was signed incorrectly and is missing an attribute. What must the engineer do to upload the certificate?

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Suggested Answer: C

by William at Jan 22, 2026, 05:32 PM

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Kristine
2 months ago
Definitely! They might need to add the missing attribute first.
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Dean
2 months ago
I agree. Validating the certificate before upload is crucial.
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Frank
2 months ago
Yeah, missing attributes can cause issues. They should re-sign it.
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Nicholle
2 months ago
Sounds frustrating! They need to check the signing process.
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Naomi
4 months ago
This seems a bit confusing, are there specific attributes we should check?
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Terrilyn
4 months ago
Just re-sign it with the right attributes, simple fix!
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Stefany
4 months ago
Wait, I thought any signed certificate would work?
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Gladis
4 months ago
Totally agree, missing attributes can cause upload issues.
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Hortencia
5 months ago
The certificate needs to be signed correctly with all required attributes.
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Wava
5 months ago
Haha, the engineer probably tried to use a certificate from their kid's lemonade stand. Gotta go with the professional stuff!
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Phillip
5 months ago
The engineer should double-check the certificate and make sure it's signed by a trusted authority. Attention to detail is key here.
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Vicki
5 months ago
I bet the engineer tried to upload a selfie instead of the actual certificate. Gotta read those instructions carefully!
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Gail
5 months ago
Sounds like a classic case of a certificate with a missing piece. Time to get that paperwork in order!
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Derrick
5 months ago
The engineer needs to ensure the certificate is properly formatted and includes all required attributes.
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Kimberlie
6 months ago
Could it be that the certificate needs to be in a specific format, like PEM or DER? I feel like I read about that somewhere.
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Delbert
6 months ago
I’m not entirely sure, but I think the engineer might need to regenerate the certificate with the correct attributes. I saw a similar question in our practice exam.
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Aleta
7 months ago
I remember something about needing to check the signing authority as well. If it’s self-signed, that could be an issue too, right?
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Bernardo
7 months ago
I think the certificate needs to have the correct key usage attributes set. Maybe it’s missing the digitalSignature or keyEncipherment?
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Yaeko
7 months ago
Ah, I see. The issue is with the certificate itself, not the upload process. I'll need to regenerate the certificate and ensure it's signed correctly with all the necessary attributes. Shouldn't be too difficult, but I'll need to be careful.
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Kristal
7 months ago
I'm a bit confused on how to approach this. What exactly is the Expressway-C server, and what are the specific certificate requirements? I'll need to do some research to understand the context better.
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Alesia
7 months ago
I've run into this problem before. The key is to make sure the certificate is properly formatted and includes all the required fields. I'll double-check the documentation to ensure I have everything right.
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Giuseppe
7 months ago
Okay, so the issue is with the certificate being signed incorrectly and missing an attribute. I'll need to figure out what that missing attribute is and make sure to include it when generating the certificate.
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Dean
8 months ago
Hmm, this seems like a tricky one. I'll need to carefully review the certificate requirements for the Expressway-C server.
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Alison
1 month ago
Maybe re-sign the certificate?
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Doug
1 month ago
They need to check the attributes.
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Hyman
2 months ago
Sounds like a signature issue.
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