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Exam SC-100 topic 4 question 14 discussion

Actual exam question from Microsoft's SC-100

Question #: 14
Topic #: 4

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
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You are designing a security strategy for providing access to Azure App Service web apps through an Azure Front Door instance.
You need to recommend a solution to ensure that the web apps only allow access through the Front Door instance.
Solution: You recommend access restrictions that allow traffic from the Front Door service tags.
Does this meet the goal?

A. Yes
B. No

Show Suggested Answer

Suggested Answer: B 🗳️

by [deleted] at Sept. 2, 2022, 1:40 p.m.

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emiliocb4

Highly Voted 2 years, 4 months ago

Selected Answer: B

if you want to block the access to A SPECIFIC front door instance the answer is B... if you want to block to any front door instance is A.... i will go for B in this case

upvoted 11 times

Ramye

1 year ago

Since the question did not mention any specific FDI then the answer should be A. If it mentioned specific FDI certainly B as it's missing the Header info.. info below "Traffic from Azure Front Door to your application originates from a well known set of IP ranges defined in the AzureFrontDoor.Backend service tag. Using a service tag restriction rule, you can restrict traffic to only originate from Azure Front Door. To ensure traffic only originates from your specific instance, you'll need to further filter the incoming requests based on the unique http header that Azure Front"

upvoted 1 times

Ramye

1 year ago

Apologies missed out a couple of words to complete the sentence, so sharing it again. Thx "Traffic from Azure Front Door to your application originates from a well known set of IP ranges defined in the AzureFrontDoor.Backend service tag. Using a service tag restriction rule, you can restrict traffic to only originate from Azure Front Door. To ensure traffic only originates from your specific instance, you'll need to further filter the incoming requests based on the unique http header that Azure Front Door sends."

upvoted 1 times

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PlumpyTumbler

Highly Voted 2 years, 5 months ago

Selected Answer: A

https://docs.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions#restrict-access-to-a-specific-azure-front-door-instance

upvoted 9 times

Ramye

1 year ago

It's A because it did not state that it needs to originate from a specific FDI so no Header info is needed so it meets the needs.

upvoted 1 times

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mikenyga

2 years, 5 months ago

Why A? Access Front Door instance, not any Front Door. Filter by http header : X-Azure-FDID

upvoted 6 times

Gurulee

1 year, 11 months ago

Agreed

upvoted 1 times

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Learing

2 years, 3 months ago

You actually need both, as headers can be set freely by whoever is calling

upvoted 1 times

TJ001

2 years, 1 month ago

It is combination of service tag and X-Azure-FDID header so this is a case where both are needed. It is explicitly mentioned in the link (to use together) https://learn.microsoft.com/en-us/azure/frontdoor/origin-security?tabs=app-service-functions&pivots=front-door-standard-premium#public-ip-address-based-origins

upvoted 2 times

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Murtuza

Most Recent 1 year, 1 month ago

Selected Answer: B

Answer is correct: B

upvoted 1 times

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calotta1

1 year, 5 months ago

Traffic from Azure Front Door to your application originates from a well known set of IP ranges defined in the AzureFrontDoor.Backend service tag. Using a service tag restriction rule, you can restrict traffic to only originate from Azure Front Door. To ensure traffic only originates from your specific instance, you'll need to further filter the incoming requests based on the unique http header that Azure Front Door sends. I'd say B https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions?tabs=azurecli#restrict-access-to-a-specific-azure-front-door-instance

upvoted 1 times

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zellck

1 year, 9 months ago

Selected Answer: B

B is the answer. https://learn.microsoft.com/en-us/azure/app-service/overview-access-restrictions#restrict-access-to-a-specific-azure-front-door-instance Traffic from Azure Front Door to your application originates from a well known set of IP ranges defined in the AzureFrontDoor.Backend service tag. Using a service tag restriction rule, you can restrict traffic to only originate from Azure Front Door. To ensure traffic only originates from your specific instance, you need to further filter the incoming requests based on the unique http header that Azure Front Door sends called X-Azure-FDID. You can find the Front Door ID in the portal.

upvoted 1 times

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uffman

1 year, 9 months ago

Selected Answer: B

Restricting using service tag is not enough, see https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions#restrict-access-to-a-specific-azure-front-door-instance

upvoted 3 times

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smudo1965

1 year, 10 months ago

Selected Answer: A

upvoted 1 times

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Gurulee

1 year, 11 months ago

Selected Answer: B

Using a service tag restriction rule, you can restrict traffic to only originate from Azure Front Door. To ensure traffic only originates from your specific instance, you'll need to further filter the incoming requests based on the unique http header that Azure Front Door sends.

upvoted 2 times

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Gurulee

1 year, 11 months ago

Selected Answer: B

https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions?tabs=azurecli#restrict-access-to-a-specific-azure-front-door-instance

upvoted 2 times

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AzureJobsTillRetire

1 year, 11 months ago

Selected Answer: B

There are at least three front door service tags. The question is not specific, and it cannot be true. AzureFrontDoor.Frontend AzureFrontDoor.Backend AzureFrontDoor.FirstParty https://learn.microsoft.com/en-us/azure/virtual-network/service-tags-overview

upvoted 3 times

gsesh32

11 months ago

This is the most logical justification for option B here. Thanks

upvoted 1 times

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hamshoo

2 years, 2 months ago

Selected Answer: B

Restricting using service tag is not enough as mentioned below. the answer is correct https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions#restrict-access-to-a-specific-azure-front-door-instance

upvoted 3 times

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JakeCallham

2 years, 3 months ago

Guys Http headers is correct and service tags is correct. Please look it up before claiming headers is wrong. https://learn.microsoft.com/en-us/azure/frontdoor/front-door-faq#how-do-i-lock-down-the-access-to-my-backend-to-only-azure-front-door-

upvoted 3 times

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darkpangel

2 years, 4 months ago

Selected Answer: A

https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions

upvoted 2 times

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inzza

2 years, 4 months ago

Answer is A

upvoted 1 times

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d3an

2 years, 4 months ago

Selected Answer: B

HTTP header required to restrict to the specific Front Door instance(s).

upvoted 3 times

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darren888

2 years, 5 months ago

B is correct To ensure traffic only originates from your specific instance, you will need to further filter the incoming requests based on the unique http header that Azure Front Door sends. The app service would qualify as a specific instance the service tag is not enough

upvoted 3 times

Ramye

1 year ago

No, it should be the other way - the App will accept traffic that originates from FDI. Now service tag should be enough if the traffic does not have to originate from a specific FDI. Header info is needed if the traffic originates from a specific FDI.

upvoted 1 times

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InformationOverload

2 years, 5 months ago

Selected Answer: A

A is correct

upvoted 2 times

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