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Exam MD-101 topic 2 question 88 discussion

Actual exam question from Microsoft's MD-101

Question #: 88
Topic #: 2

HOTSPOT -
Your network contains an on-premises Active Directory domain that contains the locations shown in the following table.

In Microsoft Intune, you enroll the Windows 10 devices shown in the following table.

You have a Delivery Optimization device configuration profile applied to all the devices. The profile is configured as shown in the following exhibit.

From which devices can Device1 and Device2 get updates? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

Reference:
https://garvis.ca/2021/06/01/delivery-optimization-know-your-options/

by czara6 at Sept. 30, 2021, 1:12 p.m.

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czara6

Highly Voted 3 years, 8 months ago

Device 1: only from Device 3 Device 2: cannot get updates from any device

upvoted 27 times

NorthBlueEdd

3 years, 2 months ago

This is correct. If logically answering the question.

upvoted 1 times

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musiman

3 years, 5 months ago

I think czara6 is correct. Select a method to restrict peer selection Starting in Windows 10, version 1803, set this policy to restrict peer selection via selected option. Currently the available options include: 0 = NAT, 1 = Subnet mask, and 2 = Local Peer Discovery. The subnet mask option applies to both Download Modes LAN (1) and Group (2). If Group mode is set, Delivery Optimization will connect to locally discovered peers that are also part of the same Group (have the same Group ID). source: https://docs.microsoft.com/en-us/windows/deployment/update/waas-delivery-optimization-reference#select-a-method-to-restrict-peer-selection

upvoted 2 times

RodrigoT

3 years, 2 months ago

No, he'not. The ip address are /16 not /24 meaning that the netmask is 255.255.0.0. So Device1 will talk to Device3 because they are in the same subnet 10.10.x.x. And since the Download mode is set to HTTP blended with peering across private group, Device1 will also talk to Device2 via NAT because they are in the same Site1. Following the logic Device2 will talk to Devices 1 and 3 via Site 1 NAT. The answer provided is correct.

upvoted 3 times

Nerovats74

2 years, 8 months ago

Restrict Peer Selection is set to subnetmask, so answer is correct

upvoted 4 times

Nerovats74

2 years, 8 months ago

No, RdrigoT is right, if HTTP blended with peering behind the same NAT was selected answer would have correct.

upvoted 1 times

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blueninja

3 years, 8 months ago

Wrong. Based on my search, I reckon the given answers are correct. HTTP blended with peering across a private group (2): Peering occurs on devices in the same Active Directory Site (if it exists) or the same domain. When this option is selected, peering crosses your NAT IP addresses https://docs.microsoft.com/en-us/mem/intune/configuration/delivery-optimization-settings#delivery-optimization

upvoted 9 times

CGtheConqueror

3 years, 5 months ago

I appreciate your use of the word reckon, blueninja is correct. the keyword here is HTTP blended with peering across a private group (2)

upvoted 4 times

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DogeZaemon

3 years, 7 months ago

There is a restriction based on the Subnet. Normally the Device1 gets updates from Device3 Device2 doesn't get update from any device

upvoted 7 times

RodrigoT

3 years, 2 months ago

But if Group mode (Group ID source in Endpoint) is set, Delivery Optimization will connect to locally discovered peers that are ALSO part of the same Group (have the same Group ID). In this case AD Site. And the devices are in the same Site1. So, for me the answer provide is correct. Check the link: https://docs.microsoft.com/en-us/windows/deployment/do/waas-delivery-optimization-reference#select-a-method-to-restrict-peer-selection

upvoted 1 times

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PiPe

Highly Voted 3 years, 4 months ago

Since 'Restrict Peer Selection' is set to limit based on subnet mask, the answers are: Device1: Can get updates from device3 only Device2: Cannot get updates from any device

upvoted 8 times

AVR31

3 years, 1 month ago

Yes, since peer selection is restricted to network mask, this is the correct answer.

upvoted 2 times

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Amir1909

Most Recent 1 year, 4 months ago

Correct

upvoted 1 times

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lannythewizard

2 years, 1 month ago

HTTP Blended with peering across private group means that computers in the same AD DS site, or same domain, can talk to each other. Also mentions doing this by subnet mask. All Devices have /16 CIDR networks, so subnet mask for ALL is 255.255.0.0 After that, the only differentiator is the two sites. All devices in Site 1 can talk to each other. Device 4 Cannot because it's in Site 2. Answer is Device 1 can talk to 2 and 3, and device 2 can talk to 1 and 3 RodrigoT is correct

upvoted 1 times

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Raxon

2 years, 2 months ago

Device1: Can get updates from Device2 and Device3 only. Device2: Can get updates from Device1 and Device3 only. Restrict Peer Selection: Subnet mask Group ID source: AD site The devices can get updates from the devices within their respective sites and subnets, but not from Device4 as it belongs to a different site. Devices 1 - 3 IP are Class A & Site 1 - Because we're not provided with additional information, we must assume the IP are on the same Subnet Mask. Device 4 IP is Class B & Site 2 - Different Subnet Mask and Site.

upvoted 3 times

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randdrick

3 years, 1 month ago

I'm agree with czara. Beacause if peering is doing with NAT Adresses, the devices must be in the same subnet. Device 1 and Device 3 are in the same subnet (10.10.255.255), not Device 2 (10.20.255.255) (see restrictions bellow) https://docs.microsoft.com/en-us/windows/deployment/do/waas-delivery-optimization-reference#select-a-method-to-restrict-peer-selection

upvoted 1 times

cbjorn8931

2 years, 7 months ago

How’s are device 1 and 3 on the same subnet ? Device 1 is on a /16 subnet mask and Device 3 is on a /24 mask? Where did you get that they are on the same network ? https://ipinfo.io/ips/10.10.1.0/24

upvoted 1 times

Graz

2 years, 5 months ago

The first two octets match. "10.10.x.x" Device 1 and 3 are on the same subnet both are /16 subnet masks

upvoted 1 times

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Raxon

2 years, 3 months ago

First 3 Devices are Class A IP addresses. Default Subnet Masks 255.0.0.0 While is not uncommon for devices to have different Subnet Masks. The question doesn't provide us with the Subnet masks for the individual devices. We then must assume they're set to default. The last Device is on Class B which would be 255.255.0.0

upvoted 1 times

lannythewizard

2 years, 1 month ago

Class A are 255.0.0.0 if there isn't CIDR notation. There is though, and all networks are a /16, so subnet mask for all of them is 255.255.0.0

upvoted 1 times

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MR_Eliot

3 years, 1 month ago

Read follwing for the correct answer! Upvote to confirm. - HTTP blended with peering across a private group (2): Peering occurs on devices in the same Active Directory Site (if it exists) or the same domain. When this option is selected, peering crosses your NAT IP addresses. - Restricts peer selection: Restricts peer selection via the selected option. Applies to Download Modes NAT (1) and Group (2). - Subnet Location 1 = Subnet Location 2 - Site1 has following locations: Location1 & Location2. So, the correct answer should be: Device1: Only device 2 Device2: Only device 1 Device3: none https://docs.microsoft.com/en-us/mem/intune/configuration/delivery-optimization-settings#delivery-optimization

upvoted 1 times

cbjorn8931

2 years, 7 months ago

This is correct! Device 3 is on the subnet /24 which not listed l. Means it cannot communicate effectively with other devices

upvoted 1 times

cbjorn8931

2 years, 7 months ago

And it doesn’t belong to site 1 or site 2

upvoted 1 times

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moobdoob

3 years, 4 months ago

My answer: Device1: Can get updates from Device3 only. Device2: Cannot get updates from any device. Based on information from the following: https://garvis.ca/2021/06/01/delivery-optimization-know-your-options/ HTTP blended with peering across private group: Computer can get updates from computers in the same Active Directory Domain Services (AD DS) site, or in the same domain. This option can be dangerous when computers are geographically dispersed, so all of a sudden your computers in Seattle are downloading from a cache in Paris. Only use this option if your AD sites are properly configured and maintained.

upvoted 2 times

cbjorn8931

2 years, 7 months ago

Device 3 is not on the same subnet

upvoted 1 times

Graz

2 years, 5 months ago

yes it is. 10.10.x.x /16 for both device 1 and device 3. Not sure where you are seeing /24 for device 3?

upvoted 2 times

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forummj

3 years, 4 months ago

I found this guide, https://garvis.ca/2021/06/01/delivery-optimization-know-your-options/ This suggests that due to the Restriction option being available only when you choose one of the Peering options, and being able to limit the peering to a subnet, it is my belief that Device 1 can only get updates from Device 3, and Device 2 can't receive updates from any other device. That is what I'm going to go with anyway.

upvoted 4 times

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LoganBundrant91

3 years, 5 months ago

So who's correct?

upvoted 7 times

RodrigoT

3 years, 2 months ago

The ip addresses are /16 not /24 meaning that the netmask is 255.255.0.0. So Device1 will talk to Device3 because they are in the same subnet 10.10.x.x. And since the Download mode is set to "HTTP blended with peering across private group", Device1 will also talk to Device2 via NAT because they are in the same Site1. Following the logic Device2 will talk to Devices 1 and 3 via Site 1 NAT. The answer provided is correct.

upvoted 1 times

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Goofer

3 years, 7 months ago

Download mode: HTTP blended with peering across a private group (2): Peering occurs on devices in the same Active Directory Site (if it exists) or the same domain. When this option is selected, peering crosses your NAT IP addresses. Restrict Peer Selection: Restricts peer selection to a specific group of devices. Group ID Source: Restricts peer selection to a specific group of devices by source. An Ad site can have more than one Subnet. The Restrict Peer Selection is set on one Subnet. So updates can only download from other computers fron one subnet. Device https://www.examtopics.com/exams/microsoft/md-101/view/14/#1: only from Device 3 Device 2: cannot get updates from any device

upvoted 4 times

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lijk_manson

3 years, 7 months ago

@blueninja So if i'm right? Device 1 and 2 from all devices?

upvoted 2 times

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