You create a virtual network named fabVNet01.
You design the virtual network to include two subnets, one named DNS-subnet and one
named Apps-subnet, as shown in the exhibit. (Click the Exhibits button.)
In the table below, identify the number of IP addresses that will be available for virtual
machines (VMs) or cloud services in each subnet. Make only one selection in each column.
Answer: 
Explanation:
DNS 27 and Apps 3 as:
/23 > 507
/24 > 251
/25 > 123
/26 > 59
/27 > 27
/28 > 11
/29 > 3
Agreed, due to reservations you are left with 27 and 3 available IP addresses.
I would explain, but this is simpler. If you go create this subnet in the portal you will see this:
Subnets Starting IP CIDR (Address Count) Usable Address Range
DNS 10.0.0.0 /27(27) 10.0.0.4 – 10.0.0.30
Apps 10.0.0.32 /29(3) 10.0.0.36 – 10.0.0.38
Each one of those addresses is usable there for:
DNS: 27
Apps: 3
The answer above is wrong – trust me.
Why?… I would say 32/DNS and 7/App
Aren’t they all usable?
Sorry I mean 32/DNS and 8/App
DNS 27and Apps 3 is correct.
No not all addresses in a subnet are usable, (The first and last IP addresses of the subnets are reserved for protocol conformance. Additionally they reserve a few extra IP addresses for their services. See http://msdn.microsoft.com/en-us/library/azure/dn133803.aspx.
Thanks!
Correct,
Are there any restrictions on using IP addresses within these subnets?
We do reserve some IP addresses within each subnet. The first and last IP addresses of the subnets are reserved for protocol conformance. We also additionally reserve a few extra IP addresses for our services.
is the above answer are correct?
dns 32, first and last cannot use, left 30
app 8, first and last cannot use, left 6
http://msdn.microsoft.com/en-us/library/azure/dn133803.aspx
Are there any restrictions on using IP addresses within these subnets?
We do reserve some IP addresses within each subnet. The first and last IP addresses of the subnets are reserved for protocol conformance. We also additionally reserve a few extra IP addresses for our services.
so possible answer is
dns 27, app 3
For 10.0.0.0/27 – 10.0.0.0 is network address, 10.0.0.31 is broadcast address as per TCP/IP protocol. Azure also reserves the first 3 usable address for internal use. So:
10.0.0.0, 1,2,3 and 31 cannot be used. From 32 address in the range we are left with 27 that can be used.
For 10.0.0.32/29 10.0.0.32 is Network, 39 is broadcast, 33,34,35 reserved. Left 3 usable.
Virtual machines provisioned in a VNET are always allocated the first available IP address in the subnet with the first 4 addresses. In this case the IP addresses .0 – .3 are reserved.
…the first 4 addresses being reserved.
The answer graphic is incorrect.
Answer is
DNS: 27
Apps: 3
DNS:27
APPs:3
the first 5 Adresse are not avilable
In all 5 addresses are reserved.
https://azure.microsoft.com/en-in/documentation/articles/virtual-networks-faq/
Are there any restrictions on using IP addresses within these subnets?
Azure reserves some IP addresses within each subnet. The first and last IP addresses of the subnets are reserved for protocol conformance, along with 3 more addresses used for Azure services.
Within a virtual network subnet, the first IP addresses of a subnet is used for the network address and last IP address for broadcast. In addition, Azure reserves the first three IP addresses in each subnet for internal purposes.
answer is DNS: 27 Apps: 3
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