Exam AZ-801 topic 5 question 6 discussion

Actual exam question from Microsoft's AZ-801

Question #: 6
Topic #: 5

Your on-premises network contains two subnets. The subnets contain servers that run Windows Server as shown in the following table.

Server4 has the following IP configurations:
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . . :
IPv4 Address . . . . . . . . . . . : 192.168.0.10
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1
From Server4, you can ping Server1 and Server2 successfully. When you ping Server3, you get a Request timed out response.
From Server2, you can ping Server1 and Server3 successfully.
The misconfiguration of which component on Server3 can cause the Request timed out response?

A. default gateway
B. IP address
C. subnet mask
D. DNS server

Show Suggested Answer

Suggested Answer: C 🗳️

by 51007 at July 24, 2022, 10:30 p.m.

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51007

Highly Voted 2 years, 4 months ago

Selected Answer: C

I'm pretty rusty on my subnetting but I'll give it a shot- The key here is we're told what works and what doesnt: S2 can ping to S1 S2 can ping to S3 implies S2 and S3 are indeed on the same subnet S4 can ping to S1 S4 can ping to S2 but S4 CANNOT ping S3 even though they should be on the same subnet Question implies a /24 mask is(or should be) in use for all since we're told there are "two subnets". 192.168.1.0/24 would cover S1 address, and 192.168.0.0/24 would cover S2/S3/S4. But if S3 had a /26 mask.. 255.255.255.192, it would cause ONLY S2 and S3 to be on the same network. Since S4's fourth octet is so far away, it would be on a different subnet IF the /26 mask was in use. So misconfigured mask would explain why S2 can ping S3 but S4 cannot ping S3.

upvoted 21 times

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blackconan0876

Most Recent 10 months ago

measure^ says dns server.It is partnered with MS.

upvoted 3 times

jajajaf342

9 months, 4 weeks ago

Can confirm Measure^ says it's the DNS server, but their explanation really makes no sense to me. I think in reality I'd be looking at the Subnet Mask. In addition their explanation confuses the server names. Just throw out this question honestly, or blindly choose DNS server if you get it on the test (since that really is the answer they're expecting...)

upvoted 2 times

sardonique

3 months, 1 week ago

DNS cache / DNS TTL could be an issue, the question doesn't say "Ping IP Address", the question says "Ping Servername". So if Server4 resolves Server3 name with a wrong IP Address, this error is likely to happen

upvoted 1 times

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syu31svc

1 year, 7 months ago

Selected Answer: C

B and D are definitely wrong; IP address misconfigured is just plain silly and DNS server is of no relevance A is wrong as default gateway has to be on same subnet as the host C is therefore correct

upvoted 2 times

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SwissGuy

1 year, 11 months ago

I take it back! The trick as always is to only consider the information provided. We are only given the subnet mask for server4, and none of the other servers. We are told that S2 can ping S1 and S3, so the subnet mask on S2 must be less than 24 or S2 and S1 would be in different subnets. Ditto S4 to S1. S4 must have a subnet mask of less than 24 for this ping to work. Reference: A subnet with 192.168.0.0/23 has an IP range of 191.168.0.1 - 191.168.1.254. Ergo: if S4 also had a /23 subnet mask the ping to S3 would work. A long-winded way of saying that 51007's conclusion is correct, but maybe helps others to understand why :-).

upvoted 3 times

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SwissGuy

1 year, 11 months ago

I think the actual question is wrong. 192.168.178.0/24 has a range of 192.168.0.1 - 192.168.0.254. Server3 and Server 4 are both within that range, so PING should work with a /24 mask as defined. PINGing Server1 from Server4 should not work as they are in different subnets! There is something wrong with the information given - it's hard to guess what the writer's intent was. I hope I get this question in the actual exam then I can mentally note if it has been corrected.

upvoted 2 times

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joehoesofat

2 years ago

Well done 5150 0r 51007. my head was foggy- glad to see it looks right

upvoted 3 times

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