VNET

Question 1

Azure VNets and allowed licenses

Answer 1

10. 0. 0.0 - 10.255. 255.255 (10/8 prefix)
    1. 16. 0.0 - 172.31. 255.255 (172.16/12 prefix)
    2. 168. 0.0 - 192.168. 255.255 (192.168/16 prefix)

Question 2

Vnet-Subnet and reserved IP addresses

Answer 2

5 IP Addresses

x. x.x.0: Network address
x. x.x.1: Reserved by Azure for the default gateway

x.x.x.2, x.x.x.3:
Reserved by Azure to map the Azure DNS IPs to the VNet space

x.x.x.255: Broadcast

Question 3

Smallest and Largest Subnets

IPv4
IPv6

Answer 3

Smallest IPv4 subnet : /29
Largest Subnet : /2

IPv6 subnets must be exactly /64 in size.

Question 4

Do VNets support multicast or broadcast?

Answer 4

No

Question 5

Can I ping my default routers within a VNet?

Answer 5

No

Question 6

Do VNets support IPv6?

Answer 6

Yes 
VNets can be 
-  IPv4-only 
OR
-  Dual stack (IPv4+IPv6).

Question 7

Can a VNet span regions or availability zones ?

Answer 7

No. A VNet is limited to a single region.

VNet does, however, span availability zones.

Question 8

Dedicated Subnet Requirement - Services ?

Answer 8

Azure VPN - GatewaySubnet
Azure Firewall 
Azure Bastion
Azure SQL Managed Instance
Azure Container Instance (ACI)
Azure Functions
Web Apps
App Service Environment
Azure Logic Apps
Azure Dedicated HSM