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Exam AZ-303 topic 6 question 4 discussion

Actual exam question from Microsoft's AZ-303
Question #: 4
Topic #: 6
[All AZ-303 Questions]

HOTSPOT -
You have an Azure subscription named Subscription1 that contains the resources in the following table.

A web server runs on VM1 and VM2.
When you request a webpage named Page1.htm from the Internet, LB1 balances the web requests to VM1 and VM2., and you receive a response.
On LB1, you have a rule named Rule1 as shown in the Rule1 exhibit. (Click the Exhibit tab.)

You have a health probe named Probe1 as shown in the Probe1 exhibit. (Click the Exhibit 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 Hide Answer
Suggested Answer:
Box 1: No -
Session Persistence is None.

Box 2: Yes -
Web requests uses the HTTP protocol, not the TCP protocol.

Box 3: No -
Note: Azure Load Balancer provides health probes for use with load-balancing rules. Health probe configuration 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 instance. 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 stops sending new flows to the respective unhealthy instance.
References:
https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview

Comments

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snobrega
Highly Voted 4 years, 5 months ago
N -Y- Y ?
upvoted 61 times
proxyxies
4 years ago
Don't really have an answer for this as I think the question does not give enough information: If a backend endpoint's health probe fails, established TCP connections to this backend endpoint continue. https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview#tcp-connections Hope someone can give some clarity here.
upvoted 1 times
max_n
3 years, 8 months ago
n-y-y ive tested
upvoted 3 times
max_n
3 years, 8 months ago
check https://www.examtopics.com/exams/microsoft/az-300/view/24/
upvoted 1 times
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Helice
3 years, 2 months ago
N,Y,Y - Regardless of configured time-out threshold, HTTP(S) load balancer health probes will automatically mark the instance as down if the server returns any status code that isn't HTTP 200 OK or if the connection is terminated via TCP reset. https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview
upvoted 1 times
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bjoernhoefer
Highly Voted 4 years, 5 months ago
Should be: No Yes Yes
upvoted 28 times
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JWFT
Most Recent 3 years, 5 months ago
Don't know how precise last answer should be: unhealthy treshold is set to two. before two health probes have failed some traffic might have been directed to vm2......than it would be NYN.....
upvoted 1 times
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syu31svc
3 years, 9 months ago
This is No Yes Yes Session persistence is none so the web page is not stuck to VM1 HTTP runs over TCP (https://developer.mozilla.org/en-US/docs/Web/HTTP/Overview) Load balancer is to direct to healthy instances
upvoted 2 times
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rdemontis
3 years, 11 months ago
Here the choice could depend by the LB SKU. In this case I think we are speaking about Basic because there isn't the HTTPS protocol option. HTTPS is available only on Standard LB, so for basic if health probe fails traffic would not flow through that specific VM: https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview
upvoted 1 times
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Alasmindas
4 years, 1 month ago
N-Y-Y is the correct answer. The 3rd question will be NO, that is whole purpose of the Load Balancer.
upvoted 2 times
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nguyenhung1121990
4 years, 1 month ago
NYY :-) Preparing for May 2021 exam and believe that's correct!
upvoted 2 times
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claudio82
4 years, 2 months ago
Its clear: Probe endpoint returns an HTTP response code other than 200 (for example, 403, 404, or 500). This will mark down the health probe immediately. So should be N Y Y (In VM2 will response 404 resource not found so traffic will redirect only for VM1)
upvoted 8 times
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claudio82
4 years, 2 months ago
Its clear: Probe endpoint returns an HTTP response code other than 200 (for example, 403, 404, or 500). This will mark down the health probe immediately. So should be N Y Y
upvoted 3 times
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as0912
4 years, 3 months ago
Seems correct N-Y-N
upvoted 2 times
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Exkitten
4 years, 3 months ago
The question is for a Load Balancer, not an Application Gateway. Load balancer health probes: “An HTTP / HTTPS probe fails when: Probe endpoint returns an HTTP response code other than 200 (for example, 403, 404, or 500). This will mark down the health probe immediately.“ https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview
upvoted 1 times
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Sheshi
4 years, 4 months ago
404 status code is considered as unhealthy as per https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting so all requests should go to remaining node
upvoted 5 times
Stan007
4 years, 3 months ago
Correct N Y Y correct, By default, Azure Application Gateway probes backend servers to check their health status and to check whether they're ready to serve requests. Users can also create custom probes to mention the host name, the path to be probed, and the status codes to be accepted as Healthy. In each case, if the backend server doesn't respond successfully, Application Gateway marks the server as Unhealthy and stops forwarding requests to the server. After the server starts responding successfully, Application Gateway resumes forwarding the requests.
upvoted 3 times
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Jamesat
4 years, 4 months ago
I think the answer is right. A load balancer probe doesn't look for a site by hostname. Just IP, protocol, and port. As long as IIS is up then it will respond (with a 404) but this would still be a response. So it would serve up the dead content (error page)
upvoted 4 times
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AmitRoy
4 years, 4 months ago
N Y Y - probe.htm tells the LB that node is up.
upvoted 2 times
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aene
4 years, 5 months ago
- No - because the session persistence is None - No - because HTTP supports TCP (transport layer). Basically, TCP - covers HTTP and HTTPS. It should be working. - No - obviously, as long as the health check (probe) of the port is not valid, the rule will be invalid and hence the traffic won't be forwarded from frontend port to backend port. This is my understanding. Please comment in case you don't agree it.
upvoted 2 times
Blimpy
4 years, 5 months ago
..understand question 2 & 3 properly.. the protocol referred to is TCP or UDP for the load balancer. web requests wont be received on UDP. probe1.htm is deleted from VM2 only so answer is N Y Y
upvoted 6 times
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pmukund7
4 years, 5 months ago
Should be: No Yes Yes
upvoted 7 times
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widurr
4 years, 5 months ago
I think it should be no-no-no. Port 80 is HTTP, but it is also a TCP and will accept TCP probing.
upvoted 1 times
bjoernhoefer
4 years, 5 months ago
@widurr - The question points to Rule1 - not Probe1! (Probe 1 - it will still work, but no file could be specified Rule 1 - If you change HTTP from TCP to UDP it will not work)
upvoted 2 times
widurr
4 years, 5 months ago
right, my bad. didn't notice the statement is about rule1, not probe1
upvoted 1 times
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MichaelCWWong
4 years, 5 months ago
If protocol is changed from TCP to UDP, webpage requests (HTTP/TCP) will be dropped by LB and error would be returned to browser. So answer #2 is Yes.
upvoted 1 times
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