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Exam AZ-104 topic 5 question 43 discussion

Actual exam question from Microsoft's AZ-104

Question #: 43
Topic #: 5

HOTSPOT -
You have an Azure subscription that contains the resources in the following table.

You install the Web Server server role (IIS) on VM1 and VM2, and then add VM1 and VM2 to LB1.
LB1 is configured as shown in the LB1 exhibit. (Click the LB1 tab.)

Rule1 is configured as shown in the Rule1 exhibit. (Click the Rule1 tab.)

For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

Box 1: Yes -
A Basic Load Balancer supports virtual machines in a single availability set or virtual machine scale set.

Box 2: Yes -
When using load-balancing rules with Azure Load Balancer, you need to specify health probes to allow Load Balancer to detect the backend endpoint status. The configuration of the health probe and probe responses determine which backend pool instances will receive new flows. You can use health probes to detect the failure of an application on a backend endpoint. You can also generate a custom response to a health probe and use the health probe for flow control to manage load or planned downtime. When a health probe fails, Load Balancer will stop sending new flows to the respective unhealthy instance. Outbound connectivity is not impacted, only inbound connectivity is impacted.

Box 3: No -
Reference:
https://docs.microsoft.com/en-us/azure/load-balancer/skus
https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview

by hamzajeljeli at May 1, 2021, 10:24 p.m.

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mlantonis

Highly Voted 4 years, 1 month ago

Correct Answer: Box 1: Yes A Basic Load Balancer supports virtual machines in a single availability set or virtual machine scale set. Box 2: Yes When using load-balancing rules with Azure Load Balancer, you need to specify health probes to allow Load Balancer to detect the backend endpoint status. The configuration of the health probe and probe responses determine which backend pool instances will receive new flows. You can use health probes to detect the failure of an application on a backend endpoint. You can also generate a custom response to a health probe and use the health probe for flow control to manage load or planned downtime. When a health probe fails, Load Balancer will stop sending new flows to the respective unhealthy instance. Outbound connectivity is not impacted, only inbound connectivity is impacted. Box 3: No There will be no loadbalancing between the VMs. Basic Load Balancer: Virtual machines in a single availability set or virtual machine scale set. Standard Load Balancer: Any virtual machines or virtual machine scale sets in a single virtual network.

upvoted 165 times

rdeleonp95

1 year, 1 month ago

If you have doubts about the box3, i could test a basic balancer on learn microsoft exercise and the http request still be the same vm host without the rule until the vm its down so basically i could consider that not get balanced if there is no rule

upvoted 1 times

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Paul_white

2 years, 3 months ago

Azure GOD!!!!!!

upvoted 6 times

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mlantonis

4 years, 1 month ago

Reference: https://docs.microsoft.com/en-us/azure/load-balancer/skus https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview

upvoted 14 times

morito

2 years, 3 months ago

I'm a bit torn on the first answer, couldn't they both technically be in the same scale set, therefore the answer could also be no?

upvoted 2 times

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techrat

3 years, 3 months ago

agreed. it's on my exam yesterday and I passed it with 923.

upvoted 19 times

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denccc

Highly Voted 4 years, 1 month ago

Answer seems correct to me: - For Basic Sku load balancer, network interface and load balancer have to be in the same availability set. (Y) - Principal of LB (Y) - Deletion of rule: there will no loadbalancing to the VM's (N)

upvoted 13 times

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Dankho

Most Recent 8 months ago

The probe does not impact whether the load balancer does balancing to the backend VMs. It just checks the health of the backend VMs and will not send traffic to a faulty or unresponsive VM so it's an extra feature. Even if the probe is missing or incorrectly configured, the load balancer will still balance traffic between the VMs. The balancing of traffic is not dependent on the health probe itself, but the probe is crucial for monitoring the health of VMs. Without a probe, the load balancer won’t stop sending traffic to a VM, even if it becomes unhealthy or unavailable. The question is misleading, and I would put No for that. Remove the probe, will it balance? yes, so answer to that question should be No. The other two are pretty straight forward. Final Answer Bob: Y N N

upvoted 1 times

Dankho

8 months ago

To help clarify further, ask the question in reverse: If Probe1.htm is not present on VM1 and VM2, LB1 will balance TCP port 80 between Vm1 and VM2? Yes (probe is just an extra feature to check health of VMs, it's not a mandatory thing you must add otherwise it won't balance)

upvoted 1 times

Dankho

8 months ago

Well, here's one caveat. if you have to provide a health probe or you can't complete the rule, then it is mandatory, and I guess I take everything back lol. There probably isn't a choice not to use the probe.

upvoted 2 times

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[Removed]

8 months, 3 weeks ago

CORRECT

upvoted 3 times

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tashakori

1 year, 3 months ago

Given answer is correct

upvoted 1 times

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MOSES3009

1 year, 7 months ago

y-y-y ; deleting the rule not means that Lb will not balance the request that are coming; more than that, will allow all connections coming to frontend IPand balance to backend

upvoted 1 times

markb258

1 year, 7 months ago

I think the question needs to specify if its an internal or public load balancer. From what I could find: If its an internal load balancer, with no rules it will now allow any traffic. But for a public load balancer allows traffic on all ports by default. I would answer no in this scenario

upvoted 1 times

markb258

1 year, 7 months ago

Also depends on basic\standard https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-overview

upvoted 1 times

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EmnCours

2 years, 9 months ago

upvoted 4 times

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Lazylinux

2 years, 12 months ago

YYN..given answer is correct and as per other comments

upvoted 2 times

Lazylinux

2 years, 12 months ago

More info Load Balancing rules: Determines how inbound traffic gets disturbed to the backend pool instances – example - incoming request on Port 80 can be either redirected to backend pool instances on different port or can be same port 80 ..so means you remove the rule then LB1 will NOT load balance Backend pool endpoints STD LB: Any virtual machines or virtual machine scale sets in a single virtual network Basic LB: Virtual machines in a single availability set or virtual machine scale set

upvoted 2 times

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Snownoodles

3 years, 10 months ago

I think Box 1 should be 'No'. Basic Load Balancer supports "Virtual machines in a single availability set or virtual machine scale set", so availability set is not the only option to Basic LB. I just did a test, if you put 2 VMs in a VMSS that in a single placement group, you can add this VMSS into Basic LB's backend pool. https://docs.microsoft.com/en-us/azure/load-balancer/skus Any suggestions?

upvoted 3 times

Mozbius_

3 years, 2 months ago

True. The question should have been formulated as [VM1 is in the same SET as VM2]. That being said in the context of the question I believe the intent of the question is to test if you are aware that a basic load balancer doesn't work with individual VMS and only supports AVAILABILITY & SCALE sets. In such context availability set is an ok answer. If I see that exact formulation in the exam I will let the testers know how badly is that question formulated.

upvoted 1 times

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J_Dawg

4 years ago

Y-Y-Y Check the link provided in the answer: LB Basic SKU is "Open by default. Network security group optional."

upvoted 4 times

JayBee65

4 years ago

How will it know what to load-balance? :)

upvoted 4 times

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imartinez

3 years, 11 months ago

I checked based on your comment. You are totally wrong and misreading the documentation . "TCP connections stay alive on an instance probe down. All TCP connections end when all probes are down." What you find is related to NSGs protecting the LB!!

upvoted 2 times

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mashk19

4 years, 1 month ago

Am I missing something here? If you delete the load balancing rule, surely you'd still have the load balancer? And the Load Balancer's job is to spread traffic between the machines sitting behind it?

upvoted 3 times