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Exam AZ-104 topic 5 question 135 discussion

Actual exam question from Microsoft's AZ-104

Question #: 135
Topic #: 5

HOTSPOT -

You have an Azure subscription that contains the virtual networks shown in the following table.

The subnets have the IP address spaces shown in the following table.

You plan to create a container app named contapp1 in the East US Azure region.

You need to create a container app environment named con-env1 that meets the following requirements:

• Uses its own virtual network.
• Uses its own subnet.
• Is connected to the smallest possible subnet.

To which virtual networks can you connect con-env1, and which subnet mask should you use? To answer, select the appropriate options in the answer area.

NOTE: Each correct selection is worth one point.

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Suggested Answer:

by [deleted] at Sept. 1, 2023, 8:08 p.m.

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Kuikz

Highly Voted 1 year, 10 months ago

Its VNET 3 only and /23 So we need a /23 mask, this means 512 IPs I am a total newbie with this so i tried to find out what the possible IP Ranges are: - VNET 1 10.1.128.0/23 = 10.1.128.0 - 10.1.129.255 (512 IPs) - Sub 1 10.1.128.0/24 = 10.1.128.0 - 10.1.128.255 (256) -> Not enough IPs available - VNET 2 192.168.0.0/16 = 192.168.0.0-192.168.255.255 - Sub21 192.168.0.0 /17 = 192.168.0.0 - 192.168.127.255 - Sub22 192.168.128.0/17 = 192.168.128.0 - 192.168.255.255 -> The subnets take out the whole range of VNET 2 - VNET 3 172.16.0.0/16 = 172.16.0.0 - 172.16.255.255 - Sub3 172.16.1.0/24 = 172.16.1.0 - 172.16.1.255 -> VNET 3 still has most of the range for a /23 available. For example we could make the following /23 subnet: 172.16.2.0/23 = 172.16.2.0 - 172.16.3.255 Please correct me if i am wrong!

upvoted 38 times

trferreiraBR

1 year, 9 months ago

VNET 3 only and /23. Why? According to Microsoft - Consumption only environment - Container Apps. It needs a subnet with IPs in Range 512. -/23 is the minimum subnet size required for virtual network integration. -The Container Apps runtime reserves a minimum of 60 IPs for infrastructure in your VNet. The reserved amount may increase up to 256 addresses as apps in your environment scale. Reference: https://learn.microsoft.com/en-us/azure/container-apps/networking?tabs=azure-cli#consumption-only-environment

upvoted 12 times

bhadrisn

1 year, 7 months ago

Your explanation is right but selected answer is wrong. /23 is the subnet size to be used. This gives answer for second box. And for the first box, from the given conditions, you choose, VNET2, because, /23 size is available only in subnet 21 and subnet 22. but subnet 21 and 23 is only attached to VNET2. So, answer for first box is VNET2

upvoted 1 times

bhadrisn

1 year, 7 months ago

Ok, my assumption is wrong. I thought we have to use only from the above subnets, but after reading the question correctly, i had another thought of which VNETs has space and to which VNET we can have the environment allocated. So, it should be VNET3 as it has space. VNET2 space is not available.

upvoted 5 times

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ducklaorange

1 year, 10 months ago

Your reasoning sounds correct to me. But its a very silly question, having to number crunch IP subnets like this is a CCNA.

upvoted 6 times

josola

1 year, 8 months ago

Azure manages its own networking environment, so yes the required knowledge should be akin to CCNA.

upvoted 4 times

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Novia

Highly Voted 1 year, 7 months ago

the Answer should be BOX 1 VNET 1 or VNET3 only BOX2 /24 we have subnet mask either /24 or /17 from all subnets. the question did not say you can create a new subnet! therefore, /24 is the samllest subnet you can CHOOSE from the two. Both VNET1 and VNET 3 have the subnets with mask /24

upvoted 16 times

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MasterMans

Most Recent 2 weeks, 5 days ago

you can use vnet 1,2,3 : smallest subnet wil be /28

upvoted 1 times

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marek_jazz

2 months, 1 week ago

Its VNET 1 and 3 a /28 subnet can be carved out of both

upvoted 1 times

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marek_jazz

2 months, 2 weeks ago

/28 is the same still if the subnet range starts with 172.x.x.x or 10.x.x.x So both VNET 1 and 3 can carve out a /28

upvoted 1 times

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674c578

4 months, 1 week ago

I guess you don't have to create but to connect to existing subnets. so... box1 = vnet1 & vnet3 and box2 = /24

upvoted 1 times

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Jay_D_Lincoln

4 months, 2 weeks ago

This is confusing. Why you guys are assuming that you need new subnets? If we need to create new subnets, then the answers are VNet3 and /23. But if we are just using one of the existing subnets, the answers are VNet2 and /23.

upvoted 1 times

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155e6a0

10 months ago

Box 1: VNet1 and Vnet3 Box 2: /26

upvoted 1 times

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certainly

10 months, 3 weeks ago

1. Workload profile environment: /27 is the minimum subnet size required 2. Consumption-only environment: /23 is the minimum subnet size required the question didn't specify which one is used. but based on the smaller subnet possible, it should be #1. /27. yet it is not available from the answer, so the next up is /26 following that logic, i would think the correct answer is 1. VNet1 and Vnet3 2. /26

upvoted 4 times

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alsmk2

11 months, 3 weeks ago

Process of elmination: • Uses its own virtual network. Vnet1 & 2 • Uses its own subnet. Vnet1 & 2 • Is connected to the smallest possible subnet. Cont App can require either a /23 (consumption only env's), or a /27 (workload profile env's). There is no /27 as an option, so the assumption is a /23 is required. Only place for a /23 is vnet3. Final answer: vnet3 only on /23

upvoted 4 times

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homer_simpson

1 year ago

Analysis: Smallest Subnet: Subnet1: 10.1.128.0/24 (256 IP addresses) Subnet21: 192.168.0.0/17 (32,768 IP addresses) Subnet22: 192.168.128.0/17 (32,768 IP addresses) Subnet3: 172.16.1.0/24 (256 IP addresses) Both Subnet1 and Subnet3 have the smallest size with a /24 subnet mask. Virtual Network Selection: Since both VNet1 and VNet3 have subnets of the smallest size (/24), you can choose either of these virtual networks. Subnet Mask: The smallest possible subnet mask for the container app environment is /24. Conclusion: Virtual networks: VNet1 or VNet3 Subnet mask: /24

upvoted 5 times

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GreenTick

1 year ago

VNET1, VNET2, and VNET3. /28. it can use all VNETs, because it's located in the same region. the subnets listed are the VNET's subnet, the maximum available range to use. the requirement is to create the smallest subnet, The smallest supported IPv4 subnet is /29, and the largest is /2 (using CIDR subnet definitions). IPv6 subnets must be exactly /64 in size https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq /29 is not in the list, so the next one will be /28.

upvoted 1 times

GreenTick

1 year ago

correction VNET1 and VNET3 only and /28 VNET2 (/16) has been used completely ( 2 x /17).

upvoted 1 times

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kam1122

1 year ago

Wt is the correct answer......

upvoted 1 times

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Ni22

1 year, 1 month ago

6/13/24 on exam

upvoted 3 times

Nickybambi

1 year, 1 month ago

what's the answer?

upvoted 2 times

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jacksparrowtabali

1 year, 4 months ago

container apps need at least 512 IP addresses: 1- Vnet 1 does not have enough the remaining from subnet 1 will be 256. 2-Vnet2 the is full equipied and we do not have any IPs available 3- Vnet3 is having 65536 IPs and only equipied with 512 IPs so we still have so much space to host our ( /23) app container. answer Vnet3 and /23

upvoted 5 times

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1828b9d

1 year, 5 months ago

This question was in exam 01/03/2024

upvoted 5 times

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Amir1909

1 year, 5 months ago

- VNet3 only - 23

upvoted 2 times

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