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Exam AZ-300 topic 1 question 74 discussion

Actual exam question from Microsoft's AZ-300

Question #: 74
Topic #: 1

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You are planning to create a virtual network that has a scale set that contains six virtual machines (VMs).
A monitoring solution on a different network will need access to the VMs inside the scale set.
You need to define public access to the VMs.
Solution: Design a scale set to automatically assign public IP addresses to all VMs.
Does the solution meet the goal?

A. Yes
B. No

Show Suggested Answer

Suggested Answer: B 🗳️

by piotr at Nov. 5, 2019, 7:55 a.m.

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piotr

Highly Voted 5 years, 9 months ago

Answer A. If all VM have public IP, monitoring solution will be able to reach them.

upvoted 46 times

jwang

5 years, 3 months ago

Correct. https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-faq

upvoted 2 times

tartar

4 years, 10 months ago

A is ok

upvoted 2 times

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praveen97

5 years ago

Agree with piotr. Answer is Yes. https://docs.microsoft.com/en-gb/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-networking#public-ipv4-per-virtual-machine

upvoted 2 times

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David_986969

4 years, 12 months ago

It can be done and it would work, but it would not be cost effective and it would let more expose de scale set. So it would not be the best solution

upvoted 2 times

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abhishek_arya02

4 years, 11 months ago

But it will not be optimal solution as it will add extra cost

upvoted 1 times

macco455

4 years, 11 months ago

There is nothing in the question to be cost effective though. Therefore it should be answer A

upvoted 2 times

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dumpmaster

Highly Voted 5 years, 8 months ago

In general, Azure scale set virtual machines do not require their own public IP addresses. For most scenarios, it is more economical and secure to associate a public IP address to a load balancer or to an individual virtual machine (aka a jumpbox), which then routes incoming connections to scale set virtual machines as needed (for example, through inbound NAT rules). However, some scenarios do require scale set virtual machines to have their own public IP addresses. An example is gaming, where a console needs to make a direct connection to a cloud virtual machine, which is doing game physics processing. Another example is where virtual machines need to make external connections to one another across regions in a distributed database.

upvoted 17 times

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nabylion

Most Recent 4 years, 11 months ago

public IP@ will be changing for each VM every time there is new VM or deletetion of existing VM in the VMSS , so monitoring will not be effective

upvoted 1 times

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gnoamchomsky

5 years ago

Question is really bad. Yes, this would meet the goal as you can access every machine through the public address. But, in ANY real world scenario - would you really assign a public IP address to all of the machines? That would be BIG no. So even though technically it would work, we should really select No.

upvoted 3 times

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[Removed]

5 years ago

There are few viable solutions to reach VMs inside Scale Set (including assigning Public IPs and using NAT) but the question is NOT to find the most suitable or least expensive solution to assign these IPs Question is - if Scale Set automatically assign Public IPs to its VMs (which is a valid option), will Monitoring Solution will be able to access these individual VMs inside Scale Set And answer for this question is Yes Although we can access these VMs through Load Balancer via NAT, this is not optimal solution for Monitoring Tool, which requires direct access to VMs it monitors Public IPs can be dynamically assigned to VMs in VMSS but this is not what they are asking So answer is A - Yes

upvoted 2 times

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nabylion

5 years ago

Public IP@ will be dynamically assigned to VMs in VMSS, so B is correct.

upvoted 3 times

ExamWynner

5 years ago

Agreed on B. The key words here is "automatically assign public IP addresses to all VMs", what if auto scale out and scale in happens?

upvoted 2 times

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tanito83

5 years ago

The answer is A. Please, modify it.

upvoted 2 times

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Clouder2020

5 years, 1 month ago

Answer seems A. https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-networking

upvoted 2 times

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sumedh01

5 years, 1 month ago

Answer : B All VMs do not need public IP addresses. Public IP addresses are necessary because they provide the load balanced entry point for the virtual machines in the scale set. The public IP address will route traffic to the appropriate virtual machines in the scale set.

upvoted 1 times

denkes

5 years, 1 month ago

Fully confusing explanation.

upvoted 3 times

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DP80

5 years, 3 months ago

The answer seems to be A. You can actually design a vmss with a public IP in each vm. This is what I found on Microsoft docs => To create a virtual machine scale set that assigns a public IP address to each VM, make sure the API version of the Microsoft.Compute/virtualMachineScaleSets resource is 2017-03-30, and add a publicipaddressconfiguration JSON packet to the scale set ipConfigurations section. Example: "publicipaddressconfiguration": { "name": "pub1", "properties": { "idleTimeoutInMinutes": 15 } } Link - https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-faq

upvoted 4 times

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Happiman

5 years, 4 months ago

There are four solutions, three of them are Deploy a standalone VM that has a public IP address to the virtual network. Implement an Azure Load Balancer. Design a scale set to automatically assign public IP addresses to all VMs. https://subscription.packtpub.com/book/virtualization_and_cloud/9781788991735/1/ch01lvl1sec17/vm-scale-sets

upvoted 6 times

TYT

5 years, 3 months ago

Stand alone VM as a jump box works, but the load balancer may not. You need specific access to a VM to monitor. Having the scale set automatically assigning public IPs also will work.

upvoted 5 times

X_L

5 years ago

LB's support NAT rules, which can translate a particular port to a particular VMSS member. There are courses on PluralSight even showing this in detail.

upvoted 2 times

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