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Exam AZ-700 topic 2 question 93 discussion

Actual exam question from Microsoft's AZ-700
Question #: 93
Topic #: 2
[All AZ-700 Questions]

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You have an Azure subscription that contains a virtual network named VNet1. VNet1 uses an IP address space of 192.168.0.0/24.

You plan to deploy Azure virtual machines and Azure Bastion to VNet1.

You need to recommend an IP subnetting configuration for VNet1. The solution must maximize the number of IP addresses that can be assigned to the virtual machines.

What should you recommend? 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 manhattan at Jan. 3, 2025, 6:28 p.m.

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Knight_Of_Peace
Highly Voted 3 months, 3 weeks ago
I believe the correct answer is: /25 and 182 Because the total address space is /24 which gives 265 IPs. This number should be used to address both of the VM subnets and the Bastion subnet. By default, Bastion subnets takes /26 which gives 64 IP address. So the remaining IP addresses from the total address space is: 256-64 = 192 available IP address to be used for VMs. But to use this IP range, needs to be divided into to VM Subnets: /25 (128 - 5 = 123) /26 (64 - 5 = 59) Based on the above the total number of the available IP address for VM subnets is: 182 In the question its asking for the "Bit mask for the LARGER virtual machine subnet" which is: /25
upvoted 8 times
bobothewiseman
3 months, 1 week ago
correct! Azure Bastion requires a /26 subnet, which provides 64 total IP addresses 256 total IPs minus 64 IPs used by Bastion leaves you with 192 IP addresses available for virtual machines. can divide the remaining 192 IP addresses into two subnets. • A /25 subnet provides 128 total IPs (after reserving the network, broadcast, and gateway, this leaves 123 usable IPs). • A /26 subnet provides 64 total IPs (after reserving the network, broadcast, and gateway, this leaves 59 usable IPs). • The larger virtual machine subnet would be /25. 123 usable IPs from the /25 subnet, plus 59 usable IPs from the /26 subnet, gives a total of 182 usable IPs for virtual machines.
upvoted 2 times
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tweezerman
3 months, 2 weeks ago
No, I don't think that is correct. Two /25 subnets would consume 2 × 128 = 256 addresses by themselves, and a /27 (for the Bastion) requires 32 addresses. Therefore, I think the answer is four /26 subnets (for the VMs), which gives 177 addresses.
upvoted 2 times
tweezerman
3 months, 2 weeks ago
Actually, I think you may be right. We could have a /26 and a /25 (and a /27 for Bastion).
upvoted 1 times
billgoldberg14
2 months, 3 weeks ago
You can't use a /27 for the bastion subnet. The smallest netmask bastion can use is a /26. So the bastion host uses a /26 then there's 2 subnets left for vm's, /26 and a /25. That will consume the whole /24 subnet.
upvoted 1 times
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Saba53
Most Recent 2 months, 2 weeks ago
/25 and 182 is correct!
upvoted 1 times
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bilzi
3 months ago
You start with 256IPs. Bastion requires a /26 CIDR, which means it takes 64IPs. Now you have 192IPs left. Which you can fit into two subnets, /25 (128IPs) and /26 (64IPs). (128IPs + 64IPs = 192IPs). The LARGER VM subnet is /25(128IPs). To figure out how many IPs can be used for VMs, you need to retract 5 azure reserved IPs from each VM subnet (bastion subnet is dedicated, you cant put VMs there). 64-5=59 128-5=123 59+123=182
upvoted 1 times
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manhattan
3 months, 3 weeks ago
Selected Answer: B
Another question/answer I don't get at all if I need to maximize the IPs for the VMs in a single subnet with the given Vnet I need a /25 for the VMs subnet (that gives you 128-5 IPs) and /25 or 26 for the Bastion is it poorly phrased or am I missing a bit? shoot your thoughts pls :-)
upvoted 1 times
dblacksmith
2 months, 1 week ago
/24. = 8bit =256 Bastion need /26 2 bit left for network =4. /26 networks with 64 host ips each Take bastion network out leaving 3 networks (192 host ip across the remaining 3) Take out reserved azure ips per network (first 4 and last one) = 15 altogether 192-15 = 177 Ans= /26. 177
upvoted 1 times
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bobothewiseman
3 months, 1 week ago
Azure Bastion requires a /26 subnet, which provides 64 total IP addresses 256 total IPs minus 64 IPs used by Bastion leaves you with 192 IP addresses available for virtual machines. can divide the remaining 192 IP addresses into two subnets. • A /25 subnet provides 128 total IPs (after reserving the network, broadcast, and gateway, this leaves 123 usable IPs). • A /26 subnet provides 64 total IPs (after reserving the network, broadcast, and gateway, this leaves 59 usable IPs). • The larger virtual machine subnet would be /25. 123 usable IPs from the /25 subnet, plus 59 usable IPs from the /26 subnet, gives a total of 182 usable IPs for virtual machines.
upvoted 2 times
manhattan
3 months, 1 week ago
yeah, it could be that one, actually I think is the only one, thanks I couldn't understand what exactly the question was asking for, "That maximum number of IPs" could be related related to the sum of the remaining Vnets IPs. Cheers
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